Data/hora: 06/06/2024 02:41:10

Provedor de dados: | 63
País: | Brazil
Título: | Nitrogen doses and water balance components at phenological stages of corn
Autores: | Silva,Monica Martins da; Libardi,Paulo Leonel; Fernandes,Flávia Carvalho Silva.
Data: | 2009-08-01
Ano: | 2009
Palavras-chave: | Internal drainage; Hydraulic conductivity; Actual evapotranspiration; Tensiometer; No-till system.
Resumo: | Determining the intensity of the water balance components in the control volume of a soil, and consequently defining the most likely periods of occurrence of a water deficit in a crop, is an exercise that requires knowledge about soil, climate and plant factors. This research aimed to evaluate soil water balance components at phenological stages of corn (Zea mays L.) under no-till system, when fertilized with 60, 120, and 180 kg ha-1 of nitrogen. The field experiment was carried out in Piracicaba, State of São Paulo, Brazil, on a Typic Hapludox. Evaluations were made in the 2004/2005 and 2005/2006 corn cropping seasons, divided over three stages according to the plant's phenology. Runoff was not taken into account. Measurements were made for precipitation (P), internal drainage (D) (or capillary rise) at a 0.8 m depth, and water storage variation (Δh) in the soil layer from 0.0-0.80 m; actual evapotranspiration (ET) was considered the unknown quantity of the equation. Corn grain yield was evaluated as well. In general, the soil water balance components were modified by N doses, because the soil had been relatively smaller Δh in treatments involving N application than in the treatment without N, resulting in smaller D values in those treatments, which resulted in greater absorption by the plants and greater ET. As expected, the plant developmental stage II had a higher ET value.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400013
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162009000400013
Formato: | text/html
Fonte: | Scientia Agricola  v.66 n.4 2009
Fonte: | info:eu-repo/semantics/openAccess