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The experiment was carried out at Estacao Experimental da Fundacao Agraria de Pesquisa Agropecuaria (FAPA) in Guarapuava- PR-Brazil from july of 2000 to march of 2001. In a pasture x crop rotation system, the objectives were: to evaluate the influence of nitrogen fertilization with and without white clover (Trifolim repens) on a oat (Avena sativa) and italian ryegrass (Lofium muftiflorum) mixture evaluating pasture and animal production; and to evaluate the influence of grazing and residual nitrogen from grazed pasture on common bean (Phaseo/us vu/garis) yield which was sowed after grazing period. In a split plot model of a complete randomized blocks design with three replicates per treatment two trials were conducted. For the winter pasture trayl treatments were nitrogen levels (O, 100, 200 and 300 kg.ha-1) and presence and absence of white clover. For the summer crop trial treatments were nitrogen levels on crop (O, 40, 80, 120 and 160 kg.ha-1) following pasture nitrogen levels and presence or absence of white clover and presence or absence of grazing. Pasture dry matter production increased in response to nitrogen fertilization, but was not affected by white clover presence. Live weight gain and live weight gain per hectare were affected by nitrogen, but not by white clover. Common bean yield showed positive response to nitrogen applied on pasture and on crop, but was not influenced by white clover nor grazing. Number of pods per plant was positively influenced by nitrogen and was the only responsible for differences in bean yield. Number of grains per pod, weight of 100 grains and harvest index were not influenced by nitrogen nor by white clover or grazing. Pasture dry matter production and liveweight gain per hectare are highly influenced by nitrogen fertilization. In a pasture x crop rotation system, which are receiving high levels of nitrogen on pasture, the residual nitrogen from recycling during grazing period can support high bean grain productivity without using any nitrogen fertilization on crop.

INTEGRAÇÃO LAVOURA-PECUÁRIA COM A CULTURA DO FEIJOEIRO E PASTAGEM DE INVERNO, EM PRESENÇA E AUSÊNCIA DE TREVO BRANCO, PASTEJO E NITROGÊNIO