Optimal plant density and nitrogen rates for improving off-season corn yields in Brazil
Sci. agric.
; 76(4): 344-352, July-Aug. 2019. ilus, mapas, tab, graf
Article
em En
| VETINDEX
| ID: vti-740889
Biblioteca responsável:
BR68.1
ABSTRACT
Integrating plant density and nitrogen (N) management is a strategy for improving corn yields, especially for off-season corn production in the tropics. This study tested the hypothesis that increasing plant densities and N rates promotes yield gains for off-season corn production in high-yielding environments. The aim of the study was to investigate the yield performances of two hybrid versions (DKB PRO and DKB PRO3) submitted to three plant densities (55,000; 65,000 and 75,000 plants ha−1) and four N rates (control, 60, 120 and 180 kg ha−1 N). Field trials were undertaken at Uberlândia-MG (site1 and 2) and Pedro Afonso-TO (site 3), Brazil from which data on corn yield parameters were collected and analyzed. Multivariate analysis separated the three trial areas into two groups, presenting high (sites 1 and 2) and low yields (site 3), which were related to weather conditions. There was no influence of a hybrid version or plant densities on crop yields at site 1 or 2. In contrast, there was a positive response to increasing plant densities and the use of DKB PRO3 at site 3. A significant response to N was observed at sites 2 and 3, following a plateau model. Our results suggest that N application rates and plant densities do have the potential to increase off-season corn yields in low yielding environments.(AU)
Texto completo:
1
Base de dados:
VETINDEX
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Sci. agric
/
Sci. agric.
Ano de publicação:
2019
Tipo de documento:
Article
/
Project document