Seed dormancy in peanut (Arachis hypogaea L.)
1981
Lily Nemsung
Studies of peanut seed dormancy were conducted in the Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkhen Campus. Results showed that during seed development and maturation, peanut seed moisture content decreased rapidly during the period of 30-60 days after the peg had touched the soil surface. The seed moisture content was about 32% when peanut seed reached physiological maturity. After physiological maturity, seed moisture content changed only slightly. Seeds of SK-38, Tainan 9, Virginia bunch 46-2, TMV-3 and NC-17 attained physiological maturity at 60, 60, 60, 70 and 70 days after the peg had touched the soil surface, respectively. Maximum seed viability of all cultivars was found before the seeds were physiologically mature. Peanut seeds were maximum in size at about the same time the seeds reached physiological maturity, but maximum seed dry weight was reached a few days later. Poor germination of fresh peanut seed was possibly due to seed dormancy. The mature seed showed higher dormancy percentage than the immature or younger seed. Peanut seed dormancy was overcome by air-drying and the period of time of storage depending on the nature of dormancy of particular cultivars. Speed of germination, seedling root growth and seedling dry weight gave similar response in seed vigor level and maximum vigor was found among the seeds which had just lost dormancy
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