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Phosphorus availability and dynamics in soil affected by long-term ruzigrass cover crop.
Almeida, Danilo S; Menezes-Blackburn, Daniel; Zhang, Hao; Haygarth, Philip M; Rosolem, Ciro A.
Afiliação
  • Almeida DS; São Paulo State University, College of Agricultural Sciences, Department of Crop Science, Botucatu 18610-307, Brazil.
  • Menezes-Blackburn D; Lancaster University, Lancaster Environment Centre, Lancaster LA1 4YQ, UK.
  • Zhang H; Sultan Qaboos University, Water and Agricultural Engineering, College of Agricultural and Marine Sciences, Department of Soils, PO Box 34, Al-khod 123, Oman.
  • Haygarth PM; Lancaster University, Lancaster Environment Centre, Lancaster LA1 4YQ, UK.
  • Rosolem CA; Lancaster University, Lancaster Environment Centre, Lancaster LA1 4YQ, UK.
Geoderma ; 337: 434-443, 2019 Mar 01.
Article em En | MEDLINE | ID: mdl-30828103
The use of grasses as cover crops in the off-season of cash crops under no-till has been largely adopted. However, soil phosphorus (P) uptake was previously shown to be reduced when ruzigrass is introduced in the rotation, affecting the viability and sustainability of this cropping system. The objective of this study was to assess the effect of ruzigrass on soil P availability and desorption kinetics under different P fertilizer application rates. A long-term field experiment where soybean (Glycine max) has been grown in rotation with ruzigrass (Urochloa ruziziensis) or fallow for 10 years, with the application of 0, 13, and 26 kg ha-1 of P, was evaluated for two consecutive years. Soil P desorption kinetics was assessed using diffusive equilibrium (DET) and gradient in thin films (DGT) techniques, as well as the DGT-induced fluxes in soils model (DIFS). Microbial biomass P (MBP) was assessed to verify if soil solution P (PDET) was reduced due to immobilization by microorganisms. Ruzigrass reduced MBP and PDET especially when P fertilizer was applied. The concentration of labile P (PDGT) was also lower after ruzigrass than in fallow. The soil ability to resupply P to soil solution was lower after ruzigrass regardless of P rates due to a slower desorption in response to the perturbation imposed by DGT. Growing ruzigrass as cover crop in the soybean off-season decreases soil P availability regardless of P fertilizer application rates by fundamentally reducing P mobility and P resupply from soil solid phase into soil solution.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Geoderma Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Geoderma Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda