Low fertilizer rates applied to corn affected growth and grain yield of associated soybean in an intrarow intercropping system
Ed Sarobol | Vichan Vichukit | Somsak Rodrong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Production efficiency of cereal-legume intercropping could be improved through the management of fertilizer. The objectives of this experiment were to investigate if low fertilizer rates applied to corn may stimulate nitrogen fixing ability of soybean nodules and may have subsequent effect on associated corn plants. The experiment was conducted at the Suwanwajokkasikij Research Station, Amphoe Pakchong, Nakornrachasima province during August 1988- December 1988. 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 monocrop soybean, monocrop corn, soybean intercropped into corn and soybean intercropped into corn and top-dressed with 16-20-0 fertilizer (15kg/rai). Nitrogen fixation was determined by the Acetylene Reduction Assay method. The results revealed that low fertilizer rates did not affect yield of soybean but intercropped soybean produced seed yield lower than monocropped soybean. Neither did top-dressing fertilizer affect intercropped soybean yield. Nodule specific activity was not affected by either type of cropping systems or low fertilizer rates. For corn, grain yield increased with increasing rates of fertilizer and intercropped corn yielded less than monocropped corn. The effect of low fertilizer rates applied to corn on dinitrogen fixation needs to be repeated.
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