A field trial was set up aiming to evaluate the effects of green cover and nitrogen fertilization on the sequential crops: common bean during the winter and upland rice during the summer. The experiment was arranged in split-plot experimental design with four replications. The main plots were green cover species (Canavalia brasiliensis, Crotalaria juncea cv. IAC-KR1, Pennisetum glaucum cv. BN-2, Sorghum bicolor cv. AG-2501C and Sorghum bicolor guinea), and a control plot kept weed free. These plants were sowed in March and mowed in May. The sub-plot were nitrogen rates as cover fertilization (0, 25, 50 and 75 kg.ha-1 of N). Common bean production was evaluated in winter season, and the best productions were observed in the plots with leguminous plants as green cover under 50 and 75 kg.ha-1 of N. The rice grain production increased in the plot with Crotalaria juncea and Canavalia brasiliensis under 50 and 75 kg.ha-1 of N. Among the grass plants, Pennisetum glaucum was the green cover that promoted the best production for both sequential crops. The rice grain production decreased in the plot with Sorghum bicolor cv. AG-2501C and Sorghum bicolor guinea.
Phaseolus vulgaris L.; Oryza sativa L. yield components; dry weight; crop rotation
