Cumulative effects of cropping systems involving corn and legumes on the yields of seventh-year crop
1992
Amnat Suwanarit | Chairerk Suwannarat | Jarong Rungchong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Field plot experiment was conducted on a Reddish Brown Lateritic soil to examine cumulative effects of different cropping systems and NP fertilizer successively applied in annual croppings for 17 years on the yields of the seventeen-year crops. The cropping systems had been corn-legumes rotations, corn-legume intercrops and sole corn. The legumes involved had been soybean, mungbean, and peanut. Result showed that plots with the long-term NP fertilizer application gave higher grain and stubble yields than those with out the fertilizer. Plots with continuous corn cropping were comparable to those with corn-legume rotation, both without and with NP fertilizer in these aspects. However, plot with corn-legume intercrops gave lower grain and stubble yields of corn than plots with continuous corn cropping. Grain yields of the intercrop legumes were drastically reduced by the NP fertilizer. The intercrop soybean was least affected by the fertilizer.
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