Itthiphon khong kan det bai kan hai pui thang bai khwam khem saeng lae kan yut ayu kan kepkieo thi mi phon to khunnaphap khong maletphan thualuang.
1985
Charuwan Bangewaek
Seed of soybean varieties S.J.4, S.J.5, OBA and accession 038 were randomly harvested from the multiplication plot at Maejo at 102, 109, 116, 123 and 129 days after emergence. Results indicated that seed of all varieties and accession deteriorated drastically as harvesting date were delayed. The result of percentage and speed of germination, seedling dry weight decreased while electrical conductivity values increased as time of harvesting was delayed. Drastic reduction in seed quality may not be due to the effect of delay harvesting alone, but also due to high relative humidity at the period in which delay harvesting was done, particularly after seed had passed physiological maturity stage. Among varieties and accession tested, soybean variety S.J.4 showed the slowest rate in seed deterioration as affected by delay harvesting. The study on soybean variety S.J.4 indicated that the yield, number of pod per plant and 100 seed weight of soybean receiving urea spray were the highest. Seed quality as indicated from standard germination test, first count test, and seedling dry weight showed that seed which wre harvested from the plot receiving 66% leaf defoliation had better quality than others because defoliation affected soybean seed by speeding up maturity. Urea spraying and light added caused the reduction in seed quality tremendously as compared to other treatments.
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