Doses e épocas de aplicação foliar de N afetando a produtividade de grãos do feijoeiro comum

Abstract

The foliar application of nitrogen on the common bean crop is becoming an usually practice among the higher farmers. However, this application does not always lead to a difference in the crop grain yield. The objective of this study was to determine the effect of rate and time of foliar nitrogen application on grain yield of two common bean cultivars. The field experiment was conducted at the 2013 in Santo Antonio de Goias, GO, in a soil under Cerrado during winter (May to August). The experimental design was a randomized block in factorial 5 x 4 x 2, factor A: N rates; factor B: crop phonological stage when N was applied; factor C: cultivar, with four replications. The treatments consisted of five nitrogen rates (0, 0.4, 0.8, 0.12 and 0.16 kg urea ha-1) applied to the common bean leaves with four phenological stages of crop development (R5, R6, R7 and R8). The studied cultivars were BRS Notavel and BRS Ametista. The application of increasing rates of nitrogen applied to the leaves and the time of this application did not affect yield components, yield and nutrient content in grains of common bean cultivars BRS Notavel and BRS Ametista.