Soybean yield in succession to single and intercropping corn and brachiaria and submitted to differents irrigation intervals

The experiment was carried at a non-acclimatized screened house, for the purpose  of evaluate influence predecessor crops to corn and brachiaria in singles and intercropped systems about soybean yield submitted to irrigation intervals. The experimental design adopted was in a split split-plot randomized block design with four replications. There were evaluated two soil classes (dystroferric Red Latosol and dystrophic Red Latosol) in the plots, three intervals between irrigations were used during the soybean flowering (each one day, two days and three days) in the subplots and three types straw in the crops autumn-winter (single corn, single brachiaria, corn intercropped with brachiaria) in the sub-subplots. Each replicate corresponded to two soybean plants cultivated in polyethylene pots containing 20 liters of dystroferric Red Latosol (dfRL) or dystrophic Red Latosol (dRL), according to the treatment. The irrigation intervals of three and two days, in dfRL and dRL, respectively, with single brachiaria at the previous crop provided greater number and weight of pods, great number of grains and soybean productivity. Irrigation every three days with single corn at the previous crop in dfRL and dRL, which resulted soybean lower performance.