Morphoagronomic characteristics of maize in response to different levels of defoliationThe present study was conducted to evaluate the damage caused by defoliation in maize. The experiment was carried out in 2005/2006 at Roma Farm, Ituverava-SP, using the triple hybrid CODETEC 304®. The experiment consisted of split plots (split-plot), which were distributed at random in three blocks, with the main treatment manual defoliation (30%, 40%, 60% and 80% defoliation) in the plots and as the secondary treatment the phenological phases (D1, D2 and D3) with three replicates for each treatment and a control plot (0% defoliation) for each block. It was evaluated the production of plots (g/m 2 ), the average size of the spikes (cm) and the average weight of thousand grains (g). According to the results, it was concluded that the source-sink relations were negatively affected, and the treatment with 80% defoliation was the one that most affected all variables, thus, it is a level of defoliation that is responsible for the largest losses, with no means of compensation for the maize crop.
RESUMO: O Objetivo do trabalho foi verificar a viabilidade climática de Ribeirão Preto -SP para o cultivo da canola. Para o presente trabalho utilizaram-se dados médios anuais de precipitação e temperatura do ar de um período 18 anos (1991-2009) da cidade de Ribeirão Preto. O balanço hídrico climatológico foi elaborado conforme proposto por Thornthwaite; Mather (1955), através do programa BHnorm elaborado em planilha EXCEL ® por Rolim et al. ( 1998), os limites climáticos para a determinação da viabilidade climática para a canola foram adaptados conforme literatura citada. Conforme resultados obtidos há viabilidade climática para o cultivo de canola em Ribeirão Preto-SP, sendo que a melhor época de semeadura se dá no início ou até meados de março, de forma a beneficiar a colheita devido à menor possibilidade de precipitação.
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