RESUMO

ABSTRACT The objective was to evaluate the effect of water salinity and environmental temperature on the nutrient consumption, digestibility, nitrogen balance, and mineral excretion of creole goats. Thirty-six males with an average age of 5.0±0.6 months and an average weight of 20.0±2.3kg were housed in metabolic cages. They are distributed in a completely randomized design, with a 2×3 type crossover (2 temperatures (T1 = 26±0.6ºC and T2 = 32±1.2ºC) and three levels of salinity (1.0, 6.0, and 12.0 dS m-1). The temperature influenced (P<0.05) the intake of water and ether (EE) extract, the digestibility of EE, organic matter and dry matter, and the concentrations of calcium and potassium in the urine of goats. There was no significant effect (P>0.05) of temperatures or water salinity levels; the animals consumed and retained averages of 10.31 and 4.19 g day-1 of nitrogen in the body, respectively. The different water salinity levels influenced (P<0.05) water intake and increased the excretions of potassium and sodium in urine. Total solids levels ranging from 640 to 9,600mg L-1 in water for goats increase water consumption, as does urine potassium and sodium excretion in urine.

RESUMO O objetivo deste estudo foi avaliar o efeito da salinidade da água e da temperatura ambiente sobre o consumo de nutrientes, a digestibilidade, o balanço de nitrogênio e a excreção mineral de caprinos crioulos. Trinta e seis machos, com idade média de 5,0 ± 0,6 meses e peso médio de 20,0±2,3kg, foram alojados em gaiolas metabólicas. O delineamento foi inteiramente ao acaso, com cruzamento do tipo 2 × 3 (duas temperaturas (T1 = 26±0,6ºC e T2 = 32±1,2ºC) e três níveis de salinidade (1,0, 6,0 e 12,0 dS m-1). A temperatura influenciou (P<0,05) a ingestão de água e o extrato etéreo (EE), a digestibilidade de EE, a matéria orgânica e a matéria seca, bem como as concentrações de cálcio e potássio na urina de caprinos. Não houve efeito significativo (P>0,05) das temperaturas ou dos níveis de salinidade da água; os animais consumiram e retiveram médias de 10,31 e 4,19g dia-1 de nitrogênio no corpo, respectivamente. Os diferentes níveis de salinidade da água influenciam (P<0,05) na ingestão de água e aumentam nas excreções urinárias de potássio e sódio; os teores de sólidos totais variando de 640 a 9.600mg L-1 na água para caprinos aumentam o consumo de água, assim como a excreção urinária de potássio e sódio.

RESUMO

Irrigated agriculture is responsible for a third of global agricultural production, but the overuse of water resources and intensification of farming practices threaten its sustainability. The use of saline water in irrigation has become an alternative in areas subjected to frequent drought, but this practice affects plant growth due to osmotic impact and excess of ions. Plant-growth-promoting rhizobacteria (PGPR) can mitigate the negative impacts of salinity and other abiotic factors on crop yields. Actinobacteria from the hyper-arid Atacama Desert could increase the plant tolerance to salinity, allowing their use as biofertilizers for lettuce crops using waters with high salt contents. In this work, rhizosphere samples of halophytic Metharme lanata were obtained from Atacama Desert, and actinobacteria were isolated and identified by 16S gene sequencing. The PGPR activities of phosphate solubilization, nitrogen fixation, and the production of siderophore and auxin were assessed at increasing concentrations of NaCl, as well as the enhancement of salt tolerance in lettuce plants irrigated with 100 mM of NaCl. Photosynthesis activity and chlorophyll content, proline content, lipid peroxidation, cation and P concentration, and the identification and quantification of phenolic compounds were assessed. The strains S. niveoruber ATMLC132021 and S. lienomycini ATMLC122021 were positive for nitrogen fixation and P solubilization activities and produced auxin up to 200 mM NaCl. In lettuce plants, both strains were able to improve salt stress tolerance by increasing proline contents, carotenoids, chlorophyll, water use efficiency (WUE), stomatal conductance (gs), and net photosynthesis (A), concomitantly with the overproduction of the phenolic compound dicaffeoylquinic acid. All these traits were positively correlated with the biomass production under saltwater irrigation, suggesting its possible use as bioinoculants for the agriculture in areas where the water resources are scarce and usually with high salt concentrations.

RESUMO

Salt stress reduces the yield and quality of colored fiber cotton production, but this problem can be mitigated by the foliar application of hydrogen peroxide in adequate concentrations. In this context, the objective of the present study was to evaluate the production and characteristics of fibers of naturally colored cotton cultivares under irrigation with low- and high-salinity water and leaf application of hydrogen peroxide. The experiment was carried out in a greenhouse under a randomized block design, arranged in 4 × 3 × 2 factorial scheme, corresponding to four concentrations of hydrogen peroxide (0, 25, 50, and 75 µM), three cultivares of colored fiber cotton ('BRS Rubi', 'BRS Topázio', and 'BRS Verde'), and two electrical conductivities of water (0.8 and 5.3 dS m-1), with three replicates and one plant per plot. Irrigation with water of 0.8 dS m-1 associated with a foliar application of 75 µM of hydrogen peroxide favored the lint and seed weight, strength, micronaire index, and maturity of 'BRS Topázio'. The 'BRS Rubi' cotton cultivar showed higher tolerance to salinity, followed by the 'BRS Topázio' and 'BRS Verde' cultivares regarding the yield of seed cotton weight, with reduction below 20% under water of 5.3 dS m-1.

RESUMO

The presence of ultrafine clay particles that are difficult to remove by conventional filtration creates many operational problems in mining processing systems. In this work, the removal of clay suspensions has been investigated using an electroflotation (EF) process with titanium electrodes. The results show that EF is a viable and novel alternative for removing ultrafine particles of kaolinite-type clay present in sedimentation tank overflows with low salt concentrations (<0.1 mol/L) in copper mining facilities based on the saline water splitting concept. Maximum suspended solid removal values of 91.4 and 83.2% in NaCl and KCl solutions, respectively, were obtained under the experimental conditions of the constant applied potential of 20 V/SHE, salinity concentration of 0.1 mol/L, and electroflotation time of 10 and 20 min in NaCl and KCl solutions, respectively. Furthermore, the visual evidence of particle aggregation by flocculation during the experiments indicates a synergy between EF and electrocoagulation (EC) that enhances the removal of ultrafine particles of kaolinite.

RESUMO

The search for polymers that meet the demands of the water recovery process in mining is a contingent challenge. Both the presence of clays and saline waters can impair water recovery from tailings when conventional flocculants are used. In this work, the adsorption of polyacrylamide (PAM), hydrolyzed polyacrylamide (HPAM), poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS), polyacrylic acid (PAA), polyethylene oxide (PEO), and guar gum (GUAR) on a kaolinite surface (010) was investigated using classical molecular dynamics. The results show that the presence of sodium chloride modifies the affinities of the polymers with kaolinite (010). At low salt concentrations, the PAM and GUAR polymers generally show higher adsorption due to the formation of hydrogen bridges. However, the highest adsorptions occur in salt solutions in the presence of HPAM by cationic bridging with sodium ions as a mediator. This high affinity of HPAM is not efficient for flocculation because it re-disperses the particles, but it is promising for the design of new additives produced by grafting HPAM groups onto advanced polymers.

RESUMO

Plasma-liquid interaction research has developed substantially in recent years due, mostly, to the numerous applications of cold atmospheric plasma (CAP). Plasma-liquid interactions are influenced by the concentrations of the ionic species present in the liquid environment, and few studies have paid attention to saline water, which generally mediates the reactions in many plasma applications. Therefore, the present review aims to explore the main results and the influence of variables on the modification of properties of saline water by CAP sources following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). The searches were carried out in the Scopus, Science Direct, and Web of Science databases, resulting in the inclusion of 37 studies. The main effects of the interaction between CAP and saline water are (i) the production of reactive oxygen and nitrogen species (RONS); (ii) the increase in conductivity and decrease in pH, directly proportional to the increase in discharge voltage; (iii) and the effective area of interaction and the shortest distance between electrode and solution. Other effects are the localized evaporation and crystallization of salts, which make the interaction between plasma and saline water a promising field in the development of technologies for desalination and improvement of liquid properties.

RESUMO

The production of soursop seedlings in the Northeast region of Brazil has faced limitations due to the high concentrations of salts in the water, so it is necessary to use techniques that enable its cultivation, and the application of hydrogen peroxide to minimize the deleterious effects of salt stress stands out. In this context, the objective was to evaluate forms of application of hydrogen peroxide as an attenuator of salt stress on the gas exchange and growth of soursop seedlings cv. Morada Nova. The experiment was conducted under greenhouse conditions, in an Regolithic Neosol of sandy loam texture, from the municipality of Lagoa Seca - PB. A completely randomized design was used in a 5 × 4 factorial arrangement, whose treatments resulted from the combination of five levels of electrical conductivity of irrigation water - ECw (0.6 - control, 1.2, 1.8, 2.4 and 3.0 dS m-1) and four forms of hydrogen peroxide application (M1 - without H2O2 application, M2 - application by seed soaking, M3 - application by foliar spraying, and M4 - application by seed soaking + foliar spraying), with four replicates and two plants per experimental unit, totaling 160 plants. The concentration of H2O2 used in the different forms of application was 20 µM. Irrigation water salinity from 0.6 dS m-1 reduced the gas exchange and growth of soursop. The method of H2O2 application by foliar spraying minimized the effects of salt stress on gas exchange. The method of H2O2 application by seed soaking reduced the effect of salt stress on the growth of soursop at 85 days after sowing.

A produção de mudas de gravioleira na região semiárida do Brasil tem enfrentado limitações devido às elevadas concentrações de sais nas águas, sendo necessário o uso de técnicas que viabilizem seu cultivo, destacando-se a aplicação do peróxido de hidrogênio. Neste contexto, objetivou-se avaliar as formas de aplicação do peróxido de hidrogênio como atenuante do estresse salino nas trocas gasosas e no crescimento de mudas de gravioleira cv. Morada Nova. O estudo foi conduzido sob condições de casa de vegetação, em um Neossolo Regolítico de textura franco-arenosa, utilizando-se o delineamento inteiramente casualizado, no arranjo fatorial 5 × 4, cujos tratamentos resultaram da combinação de cinco níveis de condutividade elétrica da água de irrigação - CEa (0,6 - testemunha; 1,2; 1,8; 2,4 e 3,0 dS m-1) e quatro formas de aplicação de peróxido de hidrogênio (M1- sem aplicação de H2O2, M2 - aplicação via embebição das sementes, M3 -aplicação por pulverização foliar e M4 - aplicação via embebição das sementes + pulverização foliar), com quatro repetições e duas plantas por unidade experimental, perfazendo o total de 160 plantas. A concentração de H2O2 utilizada nas diferentes formas de aplicação foi de 20 µM. A salinidade da água de irrigação a partir de 0,6 dS m-1 diminuiu as trocas gasosas e o crescimento das plantas de gravioleira. O método de aplicação do H2O2 via pulverização foliar minimizou o efeito do estresse salino sobre as trocas gasosas. O método de aplicação do H2O2 via embebição das sementes diminuiu o estresse salino no crescimento de gravioleira aos 85 dias após o semeio.

Assuntos

RESUMO

This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3- and ammonium - NH4+) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-¹ reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3- form the most suitable for the cultivation of the species.(AU)

Este trabalho foi desenvolvido com o objetivo de avaliar os efeitos dos íons nitrato e amônio sobre o acúmulo de nutrientes e produção da abobrinha italiana (cv. Caserta) cultivada em sistema hidropônico sob estrese salino. O experimento foi conduzido em casa de vegetação utilizando o delineamento experimental em blocos casualizados, arranjados em esquema fatorial 2 x 5, com 4 repetições. Os tratamentos foram constituídos de duas formas de nitrogênio (nitrato - NO3- e amônio - NH4+) e cinco níveis de condutividade elétrica da água de irrigação (CEa) (0,5; 2,0; 3,5; 5,0 e 6,5 dS m-¹). As análises dos resultados indicaram que suprimento de N exclusivamente em forma de NH4+ promove maiores danos na membrana foliar e redução no acúmulo de macronutrientes e maiores relações Na+/K+, Na+/Ca++ e Na+/Mg++ na parte aérea das plantas de abobrinha. A irrigação com água a cima de 2,0 dS m-¹ reduz o acúmulo de nutrientes na parte aérea das plantas e a produção de abobrinha. A toxicidade do NH4+ sob abobrinha italiana sobrepõe-se à toxicidade da salinidade, pois a fertilização exclusiva com esta forma de nitrogênio inibe sua produção, sendo a forma NO3- a mais adequada para o cultivo da espécie.(AU)

Assuntos

RESUMO

This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3- and ammonium - NH4+) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-¹ reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3- form the most suitable for the cultivation of the species.

Este trabalho foi desenvolvido com o objetivo de avaliar os efeitos dos íons nitrato e amônio sobre o acúmulo de nutrientes e produção da abobrinha italiana (cv. Caserta) cultivada em sistema hidropônico sob estrese salino. O experimento foi conduzido em casa de vegetação utilizando o delineamento experimental em blocos casualizados, arranjados em esquema fatorial 2 x 5, com 4 repetições. Os tratamentos foram constituídos de duas formas de nitrogênio (nitrato - NO3- e amônio - NH4+) e cinco níveis de condutividade elétrica da água de irrigação (CEa) (0,5; 2,0; 3,5; 5,0 e 6,5 dS m-¹). As análises dos resultados indicaram que suprimento de N exclusivamente em forma de NH4+ promove maiores danos na membrana foliar e redução no acúmulo de macronutrientes e maiores relações Na+/K+, Na+/Ca++ e Na+/Mg++ na parte aérea das plantas de abobrinha. A irrigação com água a cima de 2,0 dS m-¹ reduz o acúmulo de nutrientes na parte aérea das plantas e a produção de abobrinha. A toxicidade do NH4+ sob abobrinha italiana sobrepõe-se à toxicidade da salinidade, pois a fertilização exclusiva com esta forma de nitrogênio inibe sua produção, sendo a forma NO3- a mais adequada para o cultivo da espécie.

Assuntos

RESUMO

Abstract This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3- and ammonium - NH4+) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3- form the most suitable for the cultivation of the species.

Resumo Este trabalho foi desenvolvido com o objetivo de avaliar os efeitos dos íons nitrato e amônio sobre o acúmulo de nutrientes e produção da abobrinha italiana (cv. Caserta) cultivada em sistema hidropônico sob estrese salino. O experimento foi conduzido em casa de vegetação utilizando o delineamento experimental em blocos casualizados, arranjados em esquema fatorial 2 x 5, com 4 repetições. Os tratamentos foram constituídos de duas formas de nitrogênio (nitrato - NO3- e amônio - NH4+) e cinco níveis de condutividade elétrica da água de irrigação (CEa) (0,5; 2,0; 3,5; 5,0 e 6,5 dS m-1). As análises dos resultados indicaram que suprimento de N exclusivamente em forma de NH4+ promove maiores danos na membrana foliar e redução no acúmulo de macronutrientes e maiores relações Na+/K+, Na+/Ca++ e Na+/Mg++ na parte aérea das plantas de abobrinha. A irrigação com água a cima de 2,0 dS m-1 reduz o acúmulo de nutrientes na parte aérea das plantas e a produção de abobrinha. A toxicidade do NH4+ sob abobrinha italiana sobrepõe-se à toxicidade da salinidade, pois a fertilização exclusiva com esta forma de nitrogênio inibe sua produção, sendo a forma NO3- a mais adequada para o cultivo da espécie.

RESUMO

This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3 - and ammonium - NH4 + ) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4 + form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+ /K+ , Na+ /Ca++ and Na+ /Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4 + under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3 - form the most suitable for the cultivation of the species.

Este trabalho foi desenvolvido com o objetivo de avaliar os efeitos dos íons nitrato e amônio sobre o acúmulo de nutrientes e produção da abobrinha italiana (cv. Caserta) cultivada em sistema hidropônico sob estrese salino. O experimento foi conduzido em casa de vegetação utilizando o delineamento experimental em blocos casualizados, arranjados em esquema fatorial 2 x 5, com 4 repetições. Os tratamentos foram constituídos de duas formas de nitrogênio (nitrato - NO3 - e amônio - NH4 + ) e cinco níveis de condutividade elétrica da água de irrigação (CEa ) (0,5; 2,0; 3,5; 5,0 e 6,5 dS m-1). As análises dos resultados indicaram que suprimento de N exclusivamente em forma de NH4 + promove maiores danos na membrana foliar e redução no acúmulo de macronutrientes e maiores relações Na+ /K+ , Na+ /Ca++ e Na+ /Mg++ na parte aérea das plantas de abobrinha. A irrigação com água a cima de 2,0 dS m-1 reduz o acúmulo de nutrientes na parte aérea das plantas e a produção de abobrinha. A toxicidade do NH4 + sob abobrinha italiana sobrepõe-se à toxicidade da salinidade, pois a fertilização exclusiva com esta forma de nitrogênio inibe sua produção, sendo a forma NO3 - a mais adequada para o cultivo da espécie.

Assuntos

RESUMO

Due to its necessity and magnitude, water is essential for animal nutrition. This study aimed to evaluate the effects of increasing levels of water salinity on the quality of goat milk in the Brazilian semiarid region. Twenty-four multiparous Alpine goats, with an average live weight of 38.0 ± 4.0 kg and an average lactation period of 30 days, distributed entirely at random, were used. The experiment lasted 64 days including an initial period of 14 days of adaption to the diet. The experimental treatments consisted of water with different levels of total dissolved solids (TDS): 640, 3188, 5740, and 8326 mg L-1, obtained using sodium chloride (NaCl). Increasing the levels of TDS in drinking water from 640 to 8326 mg L-1 did not significantly (p > 0.05) affect the production and the physicochemical composition of the milk. There was a linear increase (p < 0.05) in the water consumption and acidity variables as a function of the total dissolved solid levels. The mineral composition of the milk was not altered with increasing levels of TDS in water from 640 to 8326 mg L-1. There was no negative effect (p > 0.05) for any of the sensorial attributes analyzed in relation to the treatments. Therefore, as a general conclusion, based on the analyses carried out in this experiment, it was found that water with total dissolved solids, when supplied for short periods of up to 48 days, does not alter the production, physicochemical characteristics, or the organoleptic properties of goat's milk.

RESUMO

The objective of this study was to evaluate the influence of water salinity and ambient temperature on the physiological variables and the quality of Japanese quail eggs (Coturnix coturnix japonica) in the laying phase. The quails received water with increasing levels of salinity (1.5, 3.0, 4.5 and 6.0 dS m-1) and were kept in climatic chambers under two different temperatures (24ºC and 32ºC). The design used was completely randomised, with a 2 x 4 factorial arrangement (temperatures and salinity levels), with six replicates of eight birds each. Data were submitted for analysis of variance and the means were compared by the Tukey test at 5%. There was no influence (P > 0.05) of water salinity levels on the physiological variables nor on the quality of the birds' eggs. At 32oC there was an increase (P < 0.05) in respiratory rate, cloacal and body surface temperature of the birds, and a slight reduction (P < 0.05) in the weight of eggs, shells, and percentage of shell. For laying quails, water with salinity levels of up to 6.0 dSm-1 can be used and the birds can be raised in an environment with temperatures up to 32ºC.(AU)

O objetivo do trabalho foi avaliar a influência da salinidade da água e da temperatura ambiente nas variáveis fisiológicas e na qualidade dos ovos de codornas japonesas (Coturnix coturnix japonica) na fase de postura, recebendo água com níveis crescentes de salinidade (1,5, 3,0 , 4,5 e 6,0 dS m-1), e mantidos em câmaras climáticas sob duas temperaturas diferentes (24 e 32ºC). O delineamento utilizado foi inteiramente casualizado, com arranjo fatorial 2x4 (temperaturas e níveis de salinidade), com seis repetições de oito aves cada. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Tukey a 5%. Não houve influência (P > 0,05) dos níveis de salinidade da água nas variáveis fisiológicas e na qualidade dos ovos das aves. A 32ºC houve um aumento (P < 0,05) na frequência respiratória, temperatura cloacal e da superfície corporal das aves e uma pequena redução (P < 0,05) no peso dos ovos, cascas e porcentagem da casca. Para codornas em postura pode-se utilizar água com salinidade de até 6,0 dSm-1, podendo as aves ser criadas em ambiente com temperatura de até 32ºC.(AU)

Assuntos

RESUMO

The objective of this study is to evaluate physiological parameters and the adaptability of Santa Inês sheep to two climatic conditions 25ºC (within the thermal comfort zone [TCZ) and 32ºC (above the TCZ) and three salinity levels (2.0, 4.0, and 8.0 dS m-1). The study was developed in a climatic chamber using 36 uncastrated male sheep. The experimental design was completely randomized with a 2 ´ 3 factorial scheme composed of two temperatures, three water salinity levels, and six repetitions. The physiological variables were not affected by the salinity levels. The rectal and skin temperature and the heart and respiratory rate were higher at 32 ºC. However, the rectal temperature was within the normal range for the species. The consumption of water with different salt concentrations did not affect the adaptive responses of the animals and could be an alternative water source for sheep in regions where water has a high salinity level. The respiratory rate of sheep exposed to 32 ºC increased to eliminate body heat, and exposure to 25 ºC provided greater thermal comfort for the animals.(AU)

O objetivo do trabalho foi avaliar as variáveis fisiológicas e a adaptabilidade de ovinos da raça Santa Inês, submetidos a duas condições climáticas, 25 ºC - dentro da zona de conforto térmico (ZCT) e 32 ºC - acima da ZCT, consumindo água com três níveis de salinidade (2,0, 4,0 e 8,0 dS m-1). O estudo foi desenvolvido em câmara climática, utilizando-se 36 ovinos machos inteiros, sendo o delineamento experimental inteiramente casualizado em esquema fatorial 2 x 3, composto por duas temperaturas (parcelas repetidas no tempo) e três níveis de salinidade da água, com seis repetições. As variáveis fisiológicas não foram afetadas pelos níveis de sais na água e, na temperatura de 32 ºC a temperatura retal, superficial e a frequência cardíaca e respiratória foram mais elevadas, sendo que a temperatura retal manteve-se dentro da normalidade para a espécie. O consumo de água com diferentes concentrações de sais não afetou as respostas adaptativas dos animais, podendo ser uma alternativa de consumo para ovinos em regiões onde houver água com nível elevado de salinidade. Os ovinos ao serem expostos a temperaturas mais elevadas (32 ºC) utilizaram o aumento da frequência respiratória como forma de eliminação do calor corporal e a temperatura de 25 ºC forneceu maior conforto térmico para os animais.(AU)

Assuntos

RESUMO

The objective of this study is to evaluate physiological parameters and the adaptability of Santa Inês sheep to two climatic conditions 25ºC (within the thermal comfort zone [TCZ) and 32ºC (above the TCZ) and three salinity levels (2.0, 4.0, and 8.0 dS m-1). The study was developed in a climatic chamber using 36 uncastrated male sheep. The experimental design was completely randomized with a 2 ´ 3 factorial scheme composed of two temperatures, three water salinity levels, and six repetitions. The physiological variables were not affected by the salinity levels. The rectal and skin temperature and the heart and respiratory rate were higher at 32 ºC. However, the rectal temperature was within the normal range for the species. The consumption of water with different salt concentrations did not affect the adaptive responses of the animals and could be an alternative water source for sheep in regions where water has a high salinity level. The respiratory rate of sheep exposed to 32 ºC increased to eliminate body heat, and exposure to 25 ºC provided greater thermal comfort for the animals.

O objetivo do trabalho foi avaliar as variáveis fisiológicas e a adaptabilidade de ovinos da raça Santa Inês, submetidos a duas condições climáticas, 25 ºC - dentro da zona de conforto térmico (ZCT) e 32 ºC - acima da ZCT, consumindo água com três níveis de salinidade (2,0, 4,0 e 8,0 dS m-1). O estudo foi desenvolvido em câmara climática, utilizando-se 36 ovinos machos inteiros, sendo o delineamento experimental inteiramente casualizado em esquema fatorial 2 x 3, composto por duas temperaturas (parcelas repetidas no tempo) e três níveis de salinidade da água, com seis repetições. As variáveis fisiológicas não foram afetadas pelos níveis de sais na água e, na temperatura de 32 ºC a temperatura retal, superficial e a frequência cardíaca e respiratória foram mais elevadas, sendo que a temperatura retal manteve-se dentro da normalidade para a espécie. O consumo de água com diferentes concentrações de sais não afetou as respostas adaptativas dos animais, podendo ser uma alternativa de consumo para ovinos em regiões onde houver água com nível elevado de salinidade. Os ovinos ao serem expostos a temperaturas mais elevadas (32 ºC) utilizaram o aumento da frequência respiratória como forma de eliminação do calor corporal e a temperatura de 25 ºC forneceu maior conforto térmico para os animais.

Assuntos

RESUMO

The Brazilian Northeast region provides favorable conditions for the exploitation of several crops, but the high salt concentration in irrigation water constitutes a limiting factor for production in most cases. In this context, this study aimed to evaluate the emergence, growth and partition of photoassimilates in soursop seedlings, cv. ‘Morada Nova, subjected to irrigation with water of increasing salinity levels and to exogenous application of hydrogen peroxide. The study was carried out in plastic bags under greenhouse conditions, using a sandy loam Regolithic Neosol, in the municipality of Campina Grande, PB, Brazil. Treatments were distributed in randomized blocks, in a 5 x 5 factorial arrangement, relative to five levels of irrigation water electrical conductivity - ECw (0.7, 1.4, 2.1, 2.8 and 3.5 dS m-1) and five concentrations of hydrogen peroxide - H2O2 (0, 25, 50, 75 and 100 μM), with four replicates and three plants per plot. Increasing salt concentration compromised all variables analyzed and leaf area was most sensitive. As irrigation water electrical conductivity increased, the deleterious effects of water salinity on the emergence percentage, emergence speed index, stem diameter and leaf area were attenuated by the exogenous application of hydrogen peroxide, with highest efficiency at the concentration of 50 μM. Hydrogen peroxide concentrations above 38 μM inhibited the specific leaf area of soursop, cv. ‘Morada Nova.(AU)

A região Nordeste brasileira apresenta condições propicias à exploração de diversas culturas, mas a elevada concentração de sais na água de irrigação na maioria das vezes constitui fator limitante à produção. Neste contexto, objetivou-se avaliar a emergência, o crescimento e a partição de fotoassimilados de mudas de gravioleira cv. Morada Nova irrigada com águas de salinidade crescente e aplicação exógena de peróxido de hidrogênio. O estudo foi conduzido em sacolas plásticas sob condição de casa de vegetação, utilizando-se um Neossolo Regolítico de textura franco-arenosa, proveniente do município de Campina Grande, PB. Os tratamentos foram distribuídos em blocos casualizados, em arranjo fatorial 5 x 5, relativo a cinco níveis de condutividade elétrica da água de irrigação - CEa (0,7; 1,4; 2,1; 2,8 e 3,5 dS m-1) e cinco concentrações de peróxido de hidrogênio - H2O2 (0, 25, 50, 75 e 100 μM), com quatro repetições e três plantas por parcela. O aumento da concentração salina comprometeu todas variáveis analisadas e a área foliar foi a mais sensível. Com o incremento da condutividade elétrica da água de irrigação as variáveis: percentagem e índice de velocidade de emergência, diâmetro do caule e área foliar tiveram os efeitos deletérios da salinidade da água atenuados pela aplicação exógena do peróxido de hidrogênio, com maior eficiência na concentração de 50 μM. Concentração de peróxido de hidrogênio acima de 38 μM inibiu a área foliar específica da gravioleira cv. Morada nova.(AU)

Assuntos

RESUMO

The Brazilian Northeast region provides favorable conditions for the exploitation of several crops, but the high salt concentration in irrigation water constitutes a limiting factor for production in most cases. In this context, this study aimed to evaluate the emergence, growth and partition of photoassimilates in soursop seedlings, cv. ‘Morada Nova’, subjected to irrigation with water of increasing salinity levels and to exogenous application of hydrogen peroxide. The study was carried out in plastic bags under greenhouse conditions, using a sandy loam Regolithic Neosol, in the municipality of Campina Grande, PB, Brazil. Treatments were distributed in randomized blocks, in a 5 x 5 factorial arrangement, relative to five levels of irrigation water electrical conductivity - ECw (0.7, 1.4, 2.1, 2.8 and 3.5 dS m-1) and five concentrations of hydrogen peroxide - H2O2 (0, 25, 50, 75 and 100 μM), with four replicates and three plants per plot. Increasing salt concentration compromised all variables analyzed and leaf area was most sensitive. As irrigation water electrical conductivity increased, the deleterious effects of water salinity on the emergence percentage, emergence speed index, stem diameter and leaf area were attenuated by the exogenous application of hydrogen peroxide, with highest efficiency at the concentration of 50 μM. Hydrogen peroxide concentrations above 38 μM inhibited the specific leaf area of soursop, cv. ‘Morada Nova’.

A região Nordeste brasileira apresenta condições propicias à exploração de diversas culturas, mas a elevada concentração de sais na água de irrigação na maioria das vezes constitui fator limitante à produção. Neste contexto, objetivou-se avaliar a emergência, o crescimento e a partição de fotoassimilados de mudas de gravioleira cv. Morada Nova irrigada com águas de salinidade crescente e aplicação exógena de peróxido de hidrogênio. O estudo foi conduzido em sacolas plásticas sob condição de casa de vegetação, utilizando-se um Neossolo Regolítico de textura franco-arenosa, proveniente do município de Campina Grande, PB. Os tratamentos foram distribuídos em blocos casualizados, em arranjo fatorial 5 x 5, relativo a cinco níveis de condutividade elétrica da água de irrigação - CEa (0,7; 1,4; 2,1; 2,8 e 3,5 dS m-1) e cinco concentrações de peróxido de hidrogênio - H2O2 (0, 25, 50, 75 e 100 μM), com quatro repetições e três plantas por parcela. O aumento da concentração salina comprometeu todas variáveis analisadas e a área foliar foi a mais sensível. Com o incremento da condutividade elétrica da água de irrigação as variáveis: percentagem e índice de velocidade de emergência, diâmetro do caule e área foliar tiveram os efeitos deletérios da salinidade da água atenuados pela aplicação exógena do peróxido de hidrogênio, com maior eficiência na concentração de 50 μM. Concentração de peróxido de hidrogênio acima de 38 μM inibiu a área foliar específica da gravioleira cv. Morada nova.

Assuntos

RESUMO

The objective of this study was to evaluate the physiological responses, ethology, and ingestive behavior of female Morada Nova sheep kept in a thermoneutral environment, after thermal stress and after consuming water with different levels of salinity. Thirty-six Morada Nova females with a mean age of 10.0 ± 2.0 months and a mean weight of 25.0 ± 3.0 kg were evaluated and distributed in a climatic chamber. The experimental design was completely randomized, with a factorial scheme of 2 (air temperature (AT)) × 3 (salinity levels (SLs)) and six replications. The sheep's physiological responses, ethology (day/night), and ingestive behavior were evaluated while they were subjected to ATs of 26.0 and 32.0 °C and SLs of 3.0, 6.0, and 9.0 dS/m. With elevation in AT, the animals experienced increased (P < 0.05) rectal temperatures (RTs), respiratory rates (RFs), and surface temperatures (STs) and exhibited reduced (P < 0.05) heart rates (HRs). When consuming water with an SL of 9.0 dS/m, a HR reduction (P < 0.05) was observed. Sleep behavior increased (P < 0.05) with the increase in SL during the day. Sleeping and drinking behaviors increased (P < 0.05), and the time of inactivity was reduced (P < 0.05) during the nocturnal period with increased SLs. With increased SLs, sheep consumed more water (P < 0.05) and reduced (P < 0.05) the number of regurgitated ruminal boluses per day (NRBD). Under the conditions of thermal stress (32.0 °C), sheep need to make physiological adjustments to maintain homeothermy. Water consumption of SLs up to 9.0 dS/m causes a higher state of dormancy in female Morada Nova sheep.

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RESUMO

As altas temperaturas e baixa pluviosidade salinizam água e solo na Região Nordeste, ocasionando redução no desenvolvimento de diversas espécies, dentre elas, o feijoeiro fava.Para tanto, objetivou-se avaliar variedades de feijão-fava submetidas a níveis de salinidade e adubação orgânica. O estudo foi conduzido em ambiente protegido, nas dependências da Universidade Federal de Campina Grande, campus Pombal. O delineamento experimental foi em blocos ao acaso, disposto em esquema fatorial 3x4x5, sendo: três variedades de feijão-fava (V1: lavandeira; V2: raio-de-sol e V3: rajada), quatro volumes de esterco bovino (A1: 0% - sem adubação; A2: 8%; A3: 16% e A4: 24%), aplicados em função do volume de solo do recipiente e cinco níveis de salinidade na água de irrigação (S1= 0,3 dSm-1; S2= 1,0 dSm-1; S3= 1,7 dSm-1; S4= 2,4 dSm-1e S5= 3,1 dSm-1). A variedade Raio de Sol apresentou maior crescimento em relação às demais, entretanto a cultivar Rajada apresentou maior aclimatização às condições salinas, principalmente com uso do esterco bovino na concentração de 24%. O esterco bovino atenua o efeito nocivo da salinidade, entretanto doses acima de 16% de esterco em altas salinidades podem ser prejudiciais ao feijoeiro-fava.

The high temperatures and low rainfall salinize water and soil in the Northeast Region, causing a reduction in the development of several species, among them, fava bean. The objective of this study was to evaluate bean-fava varieties submitted to levels of salinity and organic fertilization. The study was conducted in a protected environment, in the dependencies of the Federal University of Campina Grande, Pombal campus. The experimental design was a randomized block design, arranged in a 3x4x5 factorial scheme: three varieties of bean (V1: lavandeira, V2: sunshine and V3: rajada), four volumes of bovine manure (A1: 0% - without fertilization; A2: 8%; A3: 16% and A4: 24%), applied as a function of the soil volume of the container and five levels of salinity in the irrigation water (S1 = 0.3 dSm-1; S2 = 1.0 dSm-1; S3 = 1.7 dSm-1; S4 = 2.4 dSm-1 and S5 = 3.1 dSm-1). The Raio de Sol variety presented higher growth in relation to the others, however, the cultivar Rajada presented a higher acclimatization to saline conditions, mainly with the use of bovine manure in the concentration of 24%. Bovine manure attenuates the harmful effect of salinity, however, doses above 16% of manure at high salinity can be harmful to common bean.

Assuntos

RESUMO

As altas temperaturas e baixa pluviosidade salinizam água e solo na Região Nordeste, ocasionando redução no desenvolvimento de diversas espécies, dentre elas, o feijoeiro fava.Para tanto, objetivou-se avaliar variedades de feijão-fava submetidas a níveis de salinidade e adubação orgânica. O estudo foi conduzido em ambiente protegido, nas dependências da Universidade Federal de Campina Grande, campus Pombal. O delineamento experimental foi em blocos ao acaso, disposto em esquema fatorial 3x4x5, sendo: três variedades de feijão-fava (V1: lavandeira; V2: raio-de-sol e V3: rajada), quatro volumes de esterco bovino (A1: 0% - sem adubação; A2: 8%; A3: 16% e A4: 24%), aplicados em função do volume de solo do recipiente e cinco níveis de salinidade na água de irrigação (S1= 0,3 dSm-1; S2= 1,0 dSm-1; S3= 1,7 dSm-1; S4= 2,4 dSm-1e S5= 3,1 dSm-1). A variedade Raio de Sol apresentou maior crescimento em relação às demais, entretanto a cultivar Rajada apresentou maior aclimatização às condições salinas, principalmente com uso do esterco bovino na concentração de 24%. O esterco bovino atenua o efeito nocivo da salinidade, entretanto doses acima de 16% de esterco em altas salinidades podem ser prejudiciais ao feijoeiro-fava.(AU)

The high temperatures and low rainfall salinize water and soil in the Northeast Region, causing a reduction in the development of several species, among them, fava bean. The objective of this study was to evaluate bean-fava varieties submitted to levels of salinity and organic fertilization. The study was conducted in a protected environment, in the dependencies of the Federal University of Campina Grande, Pombal campus. The experimental design was a randomized block design, arranged in a 3x4x5 factorial scheme: three varieties of bean (V1: lavandeira, V2: sunshine and V3: rajada), four volumes of bovine manure (A1: 0% - without fertilization; A2: 8%; A3: 16% and A4: 24%), applied as a function of the soil volume of the container and five levels of salinity in the irrigation water (S1 = 0.3 dSm-1; S2 = 1.0 dSm-1; S3 = 1.7 dSm-1; S4 = 2.4 dSm-1 and S5 = 3.1 dSm-1). The Raio de Sol variety presented higher growth in relation to the others, however, the cultivar Rajada presented a higher acclimatization to saline conditions, mainly with the use of bovine manure in the concentration of 24%. Bovine manure attenuates the harmful effect of salinity, however, doses above 16% of manure at high salinity can be harmful to common bean.(AU)

Assuntos