Studies on the mechanism of hindrance to growth of wheat in the acidified soil.

[摘要] We investigated the growth and yield of 4 wheat varieties in different kind of soil, - One was soil (pH. 4.2) without lime and barnyard manure and had been given 50 Kg. of ammonium sulphate, 52 kg. calcium superphosphate and 18 kg. potassiumsulphate per 10 are every year since 1936, and the other (pH. 5.8) was the control, which had been given 6O kg. of lime per 10 are every year beside three kinds of fortilizer. In the early stage of growth, the seminal roots find much difficulty in going into the acidified soil, so they come up to surface to a degtee when the soil is frozen, but this phenomenon is scarcely caused in "HIRAKIKONUGI" variety. The decrease of the height of plant and the number of stem in the acidified soil is not remarkable in the early stage of growth, but conspicuous after the middie stage. This hindrance is least to "HIRAKIKOMUGI". As for the growth of root, in the acidified soil, the decrease of number and weight is not great in the early stage of growth, but it seems that their sideroots do not come out. In the middle stage, the growth extremely hindered and the ratio of root weight to that of control at the latter part of March is 36% in "HIRAKIKOMUGl", 17% in "AKABOZU", 16% in "KOMPIRA" and 12% in "WASEKOMUGI". the root-system at the last stage of growth in acidified soil. As to the yield, that of acidified soil is much less and the ratio of the weight of grains produced per unit area to that of control is 26% in "HIRAKIKOMUGI", 5% in "AKABOZU", 13% in "KOMPIRA", and the harvest of "WASEKOMUGI" is almast nothing.

[学科分类] 农业科学（综合）