Cumulative effects of intercropping groundnut, mimosa, rice bean, sword bean, pigeon pea and lab lab on the yields of the second-year crops
1994
Amnat Suwanarit | Nipa Lekhasoonthrakorn | Jarong Rungchong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Field plot experiment was conducted on a Pakchong soil series (Reddish Brown Lateritic Group or Oxic Paleustult) at the National Corn and Sorghum Research Center to examine effects of repetitive intercropping groundnut and some green manure legumes to corn on the second-year crops. The green-manure legumes studied were thornless mimosa, rice bean, sword bean, pigeon pea and lab lab. Corn plants in the intercrop systems had been grown in double rows with spacing of 150 cm between the center of the rows and 40 cm between rows in each double row. Two rows of the legume, with row spacing of 40 cm were grown between the adjacent corn double rows. In the case of Control plot, sole corn plants were grown with the conventional spacing, 75 cm between rows and 25 cm between hills of one plant. The results obtained in the present year suggested that plots with repetitive intercropping corn with the green-manure legumes generally produced higher yields of the intercrop corn than plots with repetative cropping with sole corn. Intercropping corn-mimosa and corn-pigeon pea gave the largest increases in the yields of corn whereas intercropping sword bean gave the amallest. This effect of the intercropping was party due to the improvement of soil productivity rendered by the intercrop legume in the previous cropping.
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