Efeito da aplicação de diferentes doses de nitrogênio no feijoeiro irrigado

Abstract

Beans present as important source of protein in human food, is cultivated worldwide in the most diverse production systems. Due to the necessity of the application of nitrogen (N), in order to obtain a better development and consequently a better productivity, the present work had the objective of evaluating the behavior of the bean culture, where the parameters of growth and productivity of the bean were verified. Bean irrigated from different doses of nitrogen that were applied or not at the pre-defined dates. The experiment was carried out in a greenhouse at the Federal University of Pampa, Alegrete Campus. The experimental design was completely randomized, with five nitrogen fertilization treatments (0, 60, 120, 180 and 240 kg ha-1 of N) and four replications. Three periods were established to determine the nitrogen sufficiency index (15, 30 and 45 DAE). During the bean cycle the growth parameters were evaluated: plant height and leaf area index, and at the end of the cycle, the production parameters were evaluated: number of pods per plant, number of grains per pod, average grain weight , Final production of grains and dry matter. The results obtained in this study demonstrated that the ISN presented the need for N application at 45 DAE. The growth parameters did not present significant statistical interference with the addition of N at 45 DAE. For the production parameters, only the number of pods per plant presented a statistically significant difference for the increase of the N doses, but did not interfere in the final grain yield, which was higher in the dose of 180 kg ha-1, but not Differing statistically from the other treatments.