On the effect of the opening time of irrigation on the growth of rice plant. - Report 2 - (I) -

[摘要] At the 83 rd meeting of the Crop Science Association (1949), we reported already the first result on the effect of the opening time of irrigation about the growing and yield of the transplanting rice. This time we have studied on the above-mentioned subject applying the method of direct sowing and transplanting. Among them we are now going to report on the growing of root investigated by the washing method. (1) In comparing of direct sowing with the transplanting, the former is superior to the later in the growing of top and root. (2) In the direct sowing, we could not find any difference in the dry matter between the division filled with water from the beginning and the one filled just before the head forming, but in the transplanting it was found the division filled with water from the beginning was the best than the others. (3) In the transplanting division, the section filled with water on the 26 th of July was heavier in the dry matter of root than that filled with water on the 16 th of the same month.

[学科分类] 农业科学（综合）