Cultivo de feijão e uso de adubação nitrogenada no sistema de integração lavoura-pecuária

Abstract

The increasing availability of nitrogen for the bean (Phaseolus vulgaris) positively alters the crop. It was developed in Guarapuava, PR, Campus CEDETEG State University Midwest (UNICENTRO) during the 2008/09 work in order to compare results obtained with or without the use of grazing in winter, different doses of nitrogen applied both pasture in winter and summer crop as well as their interactions. In winter were grown oat (Avena strigosa Schreb.) And ryegrass (Lolium multiflorum Lam) and summer beans. The treatments were constituted by increasing levels of nitrogen in winter (zero, 75, 150 and 225 kg ha?¹) and summer (zero, 60, 120, 180 and 240 kg ha?¹). The experimental design was a randomized complete block in a split plot design with three replicates per treatment. For statistical analysis, the data were subjected to analysis of variance using the statistical program Sisvar and means were compared by Tukey test at 5% probability for the qualitative factor (grazing) and by regression to the quantitative factors (doses nitrogen in winter and summer), searching for the model that best expressed the relationship between the independent variable (nitrogen levels). We evaluated the production components: plant height, height of insertion of the 1st pod, number of branches, of us, of us fertile pods of seeds per pod and thousand grain weight, and the final yield of the bean. The use of nitrogen in winter pasture, regardless of whether or not grazed, do not alter the productivity of bean, but increasing doses of N influenced the productivity up to 170 kg ha?¹.