Studies on the Emergence of Rice Seedlings Seeded in Autumn and Winter : I. Relation of seeding time to survival of seeds in soil and rate of sprouting seeds

[摘要] The present paper dealt with the survival process of seeds during winter and early spring and the rate of sprouting seeds which were seeded on cropless fields or between rows of barley or wheat from November to April. 1. The earlier the seeding time was, the more the rate of sprouting seeds was decreased. Moreover the rate of sprouting seeds became lower in the order of cropless fields, between rows of barley and between rows of wheat. The time of sprouting was approximately same in seedings from December to March, delaying slightly in those in November and April. 2. Seeding in November showed more dead seeds three months after seeding than that in January. The rot of seeds in soil began at a part of the embryo and extended to the endosperm. 3. Water content of seeds reached to 32%, 3.0% and 29% one month after seeding in case of the seeding in November, December and January, respectively. 4. In view of the above facts, assumably, seeds are liable to rot in the low temperature period (i. e. January), when their physiological phase in germination proceeds during the preceding period of corn-paratively high temperature (i. e. November).

[学科分类] 农业科学（综合）