Visual indicator, germination and vigor of soybean seeds at physiological maturity
1994
Arom Sripichitt (King Mongkut's Inst. of Technology, Bangkok (Thailand). Faculty of Agricultural Technology. Dept. of Plant Production Technology)
Objectives of this study were to determine color changing of pod and seed germination and vigor of soybean (Glycine max (L.) Merr.) seeds at the physiological maturity (PM). Soybean seeds, cultivar Chiang Mai 60, obtained from Chiang Mai Field Crops Research Center were planted in the field during dry season. The seeds were sampled every two days from the sixth, seventh, eighth and ninth nodes throughout the maturation process for determination of seed dry weight accumulation, seed moisture, pod and seed color and seed shrinkage. Germination and vigor of seeds were tested at PM and harvest maturity (HM). In the first period of maximum seed dry weight, it was found that at about 60 percent moisture content seeds became shrinkage. At this period, loss of green color of pod and seed was not complete. After six days of the first maximum seed dry weight accumulation, the green color from pod and seed completely lost. This would be a reliable indicator of seed at PM. In addition, germination and vigor of seed at this PM, were substantially higher than those observed at HM.
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