Abstract
The ecological research on tops and analytical investigations on tillerings according to their orders were carried on in order to study the relation between heights of ridges and too much moisture in soil. Varieties used were Wheat NORIN No. 72, Barley SHIGA-HACHIKOKU No. 5, and SHIGA-KAIRYO-HADAKA. 1. The change of leaf colour from green to yellow or purple were noticed from the days of February. Changes of colour and their degree appeared differently on wheat and barley. These facts show that the addaptation of wheat for too much moisture is larger than that of barley. 2. Remarkable differences were recognized between each plot of 2.0, 1.5, 1.0 and 0.5 Shakn plots, both in change of leaf colour and growing stayes in every variety. 3. The percentage of tillerings without heads were high in low ridge plots especially in barley, and further the percentage of tillerngs with heads in 0.5 Shaku plots was about a half of that in 2.0 Shaku plots. 4. The influence on the number of grains per head and weights of heads was considerably remarkable in low ridge plots especially on heads of higher order tillerings. The number of grains per plant in 0.5 Shaku plots were about one third of that in 2.0 Shaku plots. 5. The comparison between 2.0 and.0.5 Shaku plots was as follows: Mean number of grains per head: On main stems, 15 to 25%, on III, 45 to 60%, and on II, 21, 41 to 43%, less in 0.5 Shaku plots than in 2.0 Shaku plots. Weight of 100 grains: On main stems, 15 to 25%, on III, about 30%, and on II, 21, 25 to 35%, less the same. Iength of head: On main stems, about 10%, on III, 25 to 35%, and on II, 21, 20 to 25%, less the same. 6. The economical culture of wheat and barley is consedered to be hard in lower than 1.0 Shakn ridge, when the whole growing period is in the wet field.
