牧草跡地に於ける種子の発芽について : (4)Vicia属種子の発芽について

抄録

In the present paper are given the results of studies on the relation between germination and depth of seeding of nine varieties of Vicia seeds in the soil used after F. elatior L. and from the soil used after sweet potato-wheat. Both soils were cultivated at the same time and used for five years. The experiments were carried out from October to November in 1954,with the following results. (1) Germination of Vicia varieties was good in the soil of rather dried condition, and the maximum of the depth of its seeding was about 7 cm. (2) Vicia seed germinates well in the soil used after F. elatior L. and also, it was good when the amplitude of soil moisture as well as soil temperature was high. (3) The soil under the F. elatior L. cultivation has promoted soil aggregation, and the amplitude of soil moisture and soil temperature in the upper parts of this soil is very remarkable ; this gives good conditions for the germination of Vicia varieties. (4) The germination of early maturing varieties, such as V. narbonensis, V. benghalensis and V. dasycarpa was especially good in the soil used after F. elatior L. cultivation, compared with the soil used after wheat-sweet potato cultivation. This was regarded as having some relation with the high soil temperature and porosity. (5) The fact that only germination of V. satica (Japanese wild variety) was worse when compared with the plot used after wheat-sweet potato cultivation, requires more study.