Soybean in cropping system in central Thailand
1984
Aphiphan Pookpakdi | Veerachai Sriwatanapongse (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
I) Study of different land preparations and planting methods on the growth and yield of soybean after rice result showed that no-tillage straw burned method provided efficient weed control measures as similar to the tillage operation. Without straw burning, weed infestation was high. The yields of soybean in the tillage plots were higher than no-tillage straw burned treatments because tillage provide better root condition for soybean growth. The yields of no-tillage, no straw burned were low due to weed infestation. Seed size of soybean on no-tillage, no straw burned was smaller than those of other treatments due to weed infestation at the later stage of plant development. II) Study on various intercropping combination of corn and soybean, corn yield in monoculture was higher than those in the intercropping. The larger the area in the intercrop which had been occupied by soybean, the lower the yield of corn. Land equivalent ratio values indicated that the best intercropping combination was 75 % soybean + 25 % corn, in which the yield of soybean in the intercrop was slightly lower than the soybean yield in the control treatment. The yield of soybean per hectare was high in 75 % and 50 % of land resulted in the competitive effect to soybean and lower the yield per plant and number of pod significantly. Neither number of seeds per pod nor seed size were affected by intercropping combination.
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