Cumulative effects of cropping systems involving corn and legumes on the yields of the eighteenth crop
1994
Amnat Suwanarit | Jarong Rungchong | Suparb Buranakarn (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 19 years on the yields of the nineteenth-year crops. The cropping systems had been corn-legume rotations, corn-legume intercrops and sole corn. The legumes involved had been, mung bean, soy bean and peanut. The results showed that plots with the long-term NP fertilizer application gave so markedly higher grain and stubble yields than those without the fertilizer that the yields from the fertilized plots were about 2 folds of those from the unfertilized plots. Plots with continuous corn cropping tended to be superior to those with corn-legume intercropping, both without and with the NP fertilizer. The fertilizer did not significantly affect the yields of mung bean and soybean but decreased the yields of soybean both when grown in rotation with corn and as intercrop.
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