Dinitrogen fixation of soybean as affected by low fertilizer rates applied to corn in intercropping systems
1991
Praprut Promsomboon | Ed Sarobol (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Improvement of production efficiency of cereal-legume intercropping could be done through fertilizer management. The objectives of this experiment were to evaluate the effect of low fertilizer rates applied to corn on dinitrogen fixation of intercropped soybean-nodules and the potential effect of increased dinitrogen fixation, resulted from applied fertilizer, on intercropped cron. The experiment was conducted at the National Corn and Sorghum Research Center, Pakchong district, Nakhon Ratchasima province during December 1989-March 1990. Treatments were arranged in Split-plot in RCB and replicated 4 times. The main-plots were 15-15-15 fertilizer at the rate of 0, 15 and 30 kg/rai and the sub-plots were monocropped corn (SW 3, T1), monocropped soybean (SJ 4, T2), soybean intrarow-intercropped into corn (T3), soybean intrarow-intercropped into corn and top-dressed with urea (T4) and alternate row of corn and soybean (T5). Acetylene Reduction Assay was employed to estimate dinitrogen fixation. Cropping systems did affect seed yield of both corn and soybean. Corn in T1 and T4 yielded the greatest (4969 and 4862 kg/ha, respectively). Soybean in T2 gave the greatest yield (1128 kg/ha). Top dressing corn with urea did not affect seed yield of both corn and soybean. Nodule specific activity was not affected by either types of cropping systems or low fertilizer rates. Seed and straw of corn in T1 and T4 contained the greatest amount of nitrogen (63.50 and 64.59 kg/ha, respectively). Corn and soybean potentially competed for nitrogen.
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