tailieunhanh - Báo cáo khoa học: " Degrading of seed quality following 8 months in storage of the rice, maize and soybean basic grade seed"

Tuyển tập báo cáo nghiên cứu khoa học của trường đại học nông nghiệp 1 đề tài: Degrading of seed quality following 8 months in storage of the rice, maize and soybean basic grade seed. | Journal of Science and Development April 2008 60-69 HANOI UNIVERSITY OF AGRICULTURE degrading OF SEED QUALity FOLLOWING 8 MONTHS iN STORAGE OF THE RICE mAiZE AND SOybEAN bASiC GRADE SEED Vu Van Liet Phung Huy Vinh Tran Thi Hong Nhung Faculty of Agronomy Hanoi University of Agriculture Department of Agriculture and Rural Development of Ha Tay province ABSTRACT Most of the seed producers in Vietnam are farmers and small seed companies. They have not yet the standard storehouses to reserve seed of agricultural crops but commonly store seeds in uncontrolled temperature and moisture brick storehouses BSH . This study identified influences of that method of seed preservation on seed quality of rice maize and soybean seeds during storage. The results showed that seed moisture content is increased from start of storage to the eighth month and the seed quality is degraded compared to Vietnam standard of crop seed. Moisture contents of rice seed after 6 months maize seed after 4 months and soybean after 3 months storage were higher than that of the standard seed. Seed vigor and viability were evaluated by TZ and seedling growth rate test. The degradation of vigor and viability value appeared in all three kinds of seed but the strongest is a soybean seed degradation from down to if used longitudinally cutting procedure. The TZ test method gives similar result as germination test does so that TZ test can be used to evaluate germination capacity of rice maize and soybean seed with high accuracy. Germination percentage of three kinds of seed is reduced after 8 months in BSH. So that rice seed after 8 months maize seed after 7 months and soybean after 4 months storage lost grade of basic seed compared to Vietnam standard for crop seed. The germination rate is different when using different tests with different substrates and methods with the same crop seeds. A large amount of fungi lives on seed surface and increases through storage months in BSH. In this study no .