Improved cultural practices in soybean
1984
Prasan Yingchol | Aphiphan Pookpakdi (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Experiment conducted at Kasetsart University, Kampangsaen Campus on Kampangsaen soil series having clayey texture, was statistically designed as randomized complete block composed of ten treatments and four replications. Rice which was previously grown in this area was harvested and rice stubbles were cut up to ground level. The area was flooded up to saturation point and water was immediately drained away. Soybean variety S.J.4 was planted on every three days interval from 4 to 31 days after the field had been flooded gave rise to 10 planting dates. No additional water was given. The delay in planting soybean would cause the depletion of soil moisture and reduced the plant stand percentage significantly. The relationship between plant stand and soil moisture was positive and linear giving the value of 0.98 and the regression line was highly significant. It can be concluded in this experiment that the success in soybean establishment after rice depends upon soil moisture available. At Kampangsaen soil in January one would obtain 90 % plant stand of soybean if planted the seeds in soil when soil moisture content was approximately 44 %. That particular soil moisture was normally obtained at approximately 7 days after flooding.
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