Leaf and soil nitrogen on common bean crop

Abstract

Almost every fertilization program has nitrogen, but its application does not always lead to increase in grain yield on bean crop, Phaseolus vulgaris L. (Leguminosae-Faboideae). This study was conducted in order to verify the urea rate (0, 30, 60, 90 and 120 g . L^-1) applied via leaf, twice, and the covering N rate (0, 25, 50 and 75 kg . ha^-1) on irrigated bean crop. A randomized complete block design, in a factorial scheme 5x4, with 4 replications was used. The seeding was accomplished mechanically on 06/05/1997 and 08/06/1998 with the ‘Pérola’ and ‘IAC Carioca’ cultivars, respectively. In low response area to N, there was no effect of N applied neither on leaf nor soil. In area with incorporation of crop residue (high C/N), the N applied on leaf increased the grain yield. The N applied on soil provided increase on N leaf content, 100 seed weight, and grain yield