Efeito de diferentes doses de nitrogênio em cobertura sobre a produtividade do feijão safrinha no sudoeste do Paraná

Abstract

Were conducted in the business area field conditions of off-season beans in city of Pato Branco - PR, in soil classified as Oxisoil in no-till system on straw over 20 years, with 770 m of altitude. In humid subtropical climate mesothermal (CFA). The experiment of planting was carried out in the last week of January 2015. The experiment was divided into 2 parts one conducted on maize crops and crop residues elsewhere on cultural soy remains. Each part of the study was four nitrogen rates (0, 30, 60 and 90 Kg.ha-1 N) applied in stage V3 bean crop. And the final grain yield in a useful plot area of 5.4 m2 (3 lines of sowing x 4 meters) with 28,8 square meters of total area in the experiment where the preceding crop was corn and where the preceding crop was Soy 38,4 square meters of total area, but despising the borders just left the floor area of 4,8 m2 (3 lines of sowing x 4 meters in length). The cultivar used was IPR Tangara, the Rio Group with long cycle. The yield components evaluated were number of pods per plant (NVP), thousand seed weight (PMS), number of seeds per pod (NGV) and number of pods per square meter (NV.m-2) and also productivity in kg.ha-1, the yield was corrected to 13% moisture, for the bean yield was threshed by hand. The data from the two experiments were subjected to analysis of variance by F test 5%. We conclude that the weather conditions and crop residues of corn and soybean did not affect the evaluated components. And the increasing levels of nitrogen also did not affect the evaluated components.