Influence of maturity stages and drying on germination, vigor and leachate of soybean seeds during storage
2001
Arom Sripichitt(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology)
Harvesting seeds at physiological maturity (PM) and drying in the shade offers and effective mean for maintenance of seed quality in soybean (Glycine max(L.) Merr.). The present study was conducted to evaluate the effects of maturity stages and desiccation on germination, vigor and leachate of soybean seeds during storage. The seeds growing at Lansak District, Uthaitani, during rainy season in 1999 were harvested either at PM or at field maturity (FM) and allowed to air-dry in intact pods either slowly under shade in the laboratory or rapidly in full sunlight. The seeds were hand shelled when seed moisture content of 14-15 percent was achieved and further dried until moisture content of 8-9 percent was obtained. Seed at PM with sun drying showed decline in vigor at 120 days of storage. Instead of no change in germination, deterioration appeared by reduction of TZ1 and increased of TZ3 to TZ5. However, such changes were small in seed at PM with shade drying. Seed at FM with sun drying showed apparent leachate at early imbibition through storage period up to 90 days, whereas seed at PM with sun drying showed leachate at 120 days of storage. This would be a practical method for the farmers to harvest earlier and avoid from field weathering.
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