Effects of shading in corn-groundnut, corn-lab lab and corn-pigeon pea intercrops on the yields of 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 shading effects of intercrop pigeon pea and intercrop lab lab on the intercrop corn and shading effects of intercrop corn on the intercrop groundnut. The former effects were assessed by comparing effects of intercrop legumes grown without trimming and with interval trimmings on the intercrop corn. The latter were assesed by comparing effects of intercrop groundnut grown by arranging plant rows along the east-west direction with those of intercrop groundnut grown by arranging plant rows along the north-west direction. The latter assessment was done without and with N fertilizer. The results lead to conclusions as follows: (1) Intercropping legumes which might shade on the intercrop corn might result in reduced yields of the intercrop corn and appropriate interval trimming of the legumes removed the depressive effect (2) In the case of intercropping a short legume, such as groundnut, to corn, arrangement of plant rows along the east-west direction might enhance the legume to compete for growth factors, resulting in reduction in yields of the intercrop corn.
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