CONCENTRATION AND PARTITIONING OF MACRO NUTRIENTS IN TWO MAIZE GENOTYPES AS RELATED TO SOIL WATER AVAILABILITY
2008
VILMA MARQUES FERREIRA | PAULO CÉSAR MAGALHÃES | FREDERICO O. M. DURÃES | CARLOS ALBERTO VASCONCELLOS | JOÃO CORREIA DE ARAUJO NETO
The amount of nutrients present in crop tissue of a certain species, at certain time, is a result of the interaction between environmental conditions and genotype. This interaction is economically and ecologically important since permits the best use of fertilizers as well as different crop management which are essential for the sustainability of the productive system. In this paper, macronutrients were quantified in different parts of two adult maize plant genotypes (BRS 2121 and BR 205), which were evaluated at field conditions. The treatments imposed in this research were four water regimes (irrigation suppression at 10 days before blooming and 15, 30 and 50 days after blooming) and three types of fertilizer side dress application of N and K (10 kg N ha-1 + 90 kg K2O ha-1 at planting and 120 kg N ha-1 at V8 stage; 10 kg N ha-1 + 45 kg K2O ha-1 at planting and 45 kg K2O ha-1 + 120 kg N ha-1 at V8 stage; 10 kg N ha-1 + 30 kg K2O ha-1 at planting, 30 kg K2O ha-1 + 60 kg N ha-1 at V8 stage and 30 kg K2O ha1 + 60 kg N ha-1 at V12 growth stage). This experiment was also carried out at greenhouse conditions on young plants of the same genotypes under four water regimes, daily irrigation or each three, five or seven days. The results showed that, at field conditions, the behavior of maize plants under water deficit varied according to nutrient and part of the plant analyzed, whereas at greenhouse conditions there was a tendency of nutrients concentration in crop tissue due to water deficit.
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