Open AccessAvaliação de índices de vegetação MODIS para detecção de desmatamentos na Amazônia
Author(s) -
Bernardo Friedrich Theodor Rudorff,
Maurício Alves Moreira,
Marcelo do Santos Targa,
José Guilherme de Freitas
Publication year - 2006
Publication title -
revista ambiente and água
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.265
H-Index - 13
ISSN - 1980-993X
DOI - 10.4136/ambi-agua.12
Subject(s) - geography , environmental science
Two agronomic experiments with wheat crop were conducted during the period of May through October of 1999 and 2000 at the experimental site of the University of Taubaté, Taubaté, São Paulo State, Brazil. The objective of this work was to evaluate the effect of different levels of irrigation and nitrogen on grain yield of two wheat cultivars. The work also intended to present the feasibility of this agriculture activity during the winter crop season in the Paraíba Valley region of São Paulo State. The experimental design allowed simulating different wheat crop growth conditions in the field in terms of the interactions among irrigation, cultivar and nitrogen factors. Results showed no significant interaction among the three factors for the analyzed agronomic characteristics. Interaction of irrigation and nitrogen, for grain yield and biomass, was observed only in 1999. Soil fertility was improved in 2000 with a positive effect on grain yield. Irrigation had a significant impact on grain yield indicating that wheat crop needs water supply for a profitable production in the Paraíba Valley region. Water balance is recommended for efficient irrigation