Estresse hídrico nas fases fenológicas do feijão vigna sob níveis de potássio.

Abstract

In semi-arid regions, water deficiency is the main environmental factor that influences the yield of plants, especially in Vigna beans, making it necessary to manage resources adequately in order to guarantee the sustainability of the production system. Thus, the objective was to evaluate the morphology and partition of phytomass of Vigna beans, cv. BRS Marataoã, when submitted to irrigation management strategies due to the time of induction of water deficit in the different phenological stages of the crop and doses of potassium fertilization. A randomized block design was used in a 5 x 5 factorial scheme, with three replications. The treatments were defined according to the five doses of potassium fertilization (50, 75, 100, 125 and 150% of K2O) associated to five management strategies defined as a function of the time of induction of water deficit in the different phenological stages of the BRS Marataoã bean. The application of water deficit in flowering favors the growth and accumulation of Vigna bean phytomass with plant recovery after stress suspension. Increasing doses of potassium when associated with water deficit in the flowering and fruiting phases compromise the number of pods and pod length of Vigna beans. In the early stages of development of BRS Marataoã beans the water deficit can be utilized from its cultivation with the lowest losses in the production components.