Studies on Oil Formation in Rape-Seed : III : On the spring-seeded rape at high lands

[摘要] Rape varieties, "Norin-No.12" and "Norin-No.16" were planted in spring at high lands in Nagano Prefecture, and processes of seed development and oil formation in seed were studied. The plants grew vigorously, and the growth rates of the pod and the seed were much more rapid than those in the autumn-seeded rape. But the seed was poorly filled up and its oil content was low. Iodine number of seed oil in "Norin-No.12" was low at the early stage of seed development, increasing rapidly untill the middle stage, and then declining slowly in the later period. In "Norin-No.16", later decline was rather obscure. Probably the relatively higher temperatures in summer accelerating the growth rate of seed during its development, hindered it from full enlarging and rich accumulation of oil, and moreover lowered the iodine number of the oil in the earlier stages.

[学科分类] 农业科学（综合）