Effect of a corn-soybean alternate row planting on microclimate, growth parameter and grain yield
1985
Wichai Termsaythong
Corn was grown as a sole crop or was intercropped with soybean. As a sole crop, corn was conventionally grown (8500 plants per rai, 75 x 25 cm) and was also planted at four plant densities (4200, 8500, and 12800 and 17000 plants per rai) in the 150 cm row width. Soybean was solely sown at a planting density of 34000 plants per rai and was also grown as intercrop with corn at a reduced density of 17000 plants per rai in a 150 cm row corn planting. Corn plant densities, in the solid and corn-legume intercrop plantings, were identical. The results indicated that there was no significant effect of treatments on temperature or relative humidity. Light intensity within the crop canopy, however, was significantly different among treatments. At the corresponding planting density, intercropping corn with soybean prolonged the silking time and reduced ear size, number of kernel per ear, seed weight and grain yield. Irrespective of the intercropping treatments, increasing corn population delayed flowering date, reduced number of ears per plant, ear size, kernel per ear and seed weight. Maximum grain yield of corn in the corn-legume intercrop was obtained with the planting density of 12800 plants per rai. For a sole crop of corn with widened row spacing, maximum grain yield occurred at planting density of 8500 plants per rai. Nevertheless, the highest grain yield of corn was conventionally grown (8500 plants per rai, 75 x 25 cm). Grain yield of soybean decreased when it was used to intercrop with corn grown at higher planting densities
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