Relação do estresse hídrico na fenologia e temperatura foliar na cultura do milho

Abstract

Leaf temperature directly impacts the high productivity of crops, in corn as leaf temperature causes negative physiological processes, which can directly affect its productivity. The objective of this work was to evaluate the variation of leaf temperature variation on maize crop yield, conducted in rainfed and irrigated conditions. The experimental design used was that of blocks, with 8 rows per block, being 6 blocks, 3 of each hybrid at different sowing times, the irrigated plots received a homogeneous water depth, supplementing the amount necessary for the development of the culture. The canopy temperature of the plants, the vegetation indices in the phenological stages were evaluated. Data were taken by the 1st reading in V10, V8 and V6 and the 2nd in reading R4, R2 and R1. The productivity of each parcel was evaluated. In the irrigated plots, irrigation was positive, with a positive difference in the canopy temperature of the plants and in the productivity of all seasons, increasing the difference in third season hybrids for being outside the recommended planting window for the state. Vegetation indices also positively in irrigated plots in relation to upland areas.