Biological nitrogen fixation of soybean as affected by low fertilizer rates applied to corn in intercropping systems
1992
Praprut Promsomboon
Improvement of production efficiency of cereal-legume intercropping could be done through fertilizer management. Low fertilizer rates did not affect BNF but cropping systems affected biological nitrogen fixation (BNF) significantly as T2 and T5 gave higher BNF than the others. The greatest BNF of soybean was obtained at R5 stage. Soybean yield was affected by low fertilizer rates and cropping system. Fertilizer rates at 15 and 30 kg/rai increased soybean yield greater than no fertilization and soybean in T2 gave the greatest yield. Though fertilizer rates did increase corn yield but the differences between treatments were non-significant. High fertilizer rates tended to increase corn yield. In the dry season, corn in T1 and T4 yielded the greatest (795 and 758 kg/rai, respectively) but in the late rainy season T1 gave the greatest yield (863 Kg./rai). Seed and straw of corn in T1 and T4 contained the greatest amount of nitrogen. Corn and soybean potentially competed for nitrogen. The competition was attributable to lesser nodule number per plant than normal in this experiment.
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