Cumulative effects of cropping systems involving corn and legumes on the yields of the thirteenth-year crops
1988
Amnat Suwanarit | Chairerk Suwannarat | Sodsai Changsalug (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Field plot experiment on a Reddish Brown Lateritic soil was conducted to examine cumulative effects of different cropping systems and NP-fertilizer successively applied in annual cropping for 13 years on the yields of the thirteenth-year crops. The cropping systems had been corn-legume rotation, corn-legume intercropping and sole corn. The legumes involved had been soybean, mungbean, and peanut. Results, from a dry year, showed that with moderate soil fertility or with NP fertilizer corn-mungbean rotation was superior to sole corn system in producing corn yeilds in the 13th year whereas corn-peanut intercrop system was inferior to sole corn system. Corn-soybean rotation, corn-peanut rotation, corn-soybean intercropping, and corn-mungbean intercropping were comparable to sole corn. For soils with low fertility and without NP-fertilizer, all of the systems were comparable in producing corn yields. NP-fertilizer reduced grain yields of intercrop legumes. This effect of NP-fertilizer was lowest with mungbean.
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