混作飼料作物の種類の組合せが作物相互間に及ぼす形態的変化及収量について予報

抄録

1. Height of stalk. The mixculture increases the height of stalks in every tested crop, and the degree of increase varies with the kinds and the combination of crops. a) The increase in height of stalk by mixculture is much larger in sorghum than in corn, and both of them are higher by the mixculture with soybean than with mungbean. b) In case of the mixture of soybean, and of mungbean, the height of stalks are almoat equally increased, but the degree of increase varies with the kind of cereals with which the are combined. In the earlier stage, the height of both soybean and mungbean increases more by the combination with corn than with sorghum; while in the later stage, they are more with sorghum than with corn. 2. Number of nodes, length of leaves, and number of branches. Testing the number of nodes and the length of leaves, we cannot find any remarkable difference between pure and mixculture, and so the height difference in stalk may be ascribed to the length of the internodes. The number of bean branches decreases by mixture, and the degree of decrease is greater in mungbean than in soybean. And in each case the decrease by mixture is more with sorghum than with corn. 3. Leaf/stalk ratio. The rotio decreases a little with growth in each crop except mungbean. In case of soybean, the ratio is increased by mixture, especially, at an early harvest time. In mungbean, however, the mixture does not affect the ratio, though it is always higher than in soybean. On the ratio of both corn and sorghum, no remarkable effect is found by mixing. 4. Yield. (Converted into per acre.) As to the yield of single crop in raw matter, 21 ton of corn and 18 ton of sorghum in pure culture respectively are more than that of each crop in the other cases. And the result is in line with those in other reports. In the total yield, 22.5 ton of sorghum and soybean mixture and 21.8 ton of corn and soybean mixture are both a little better than the yields of those crops in pure culture. Both in soybean and in mungbean, a greater decrease in the yield is brought about by the combination with corn, and they do not show any definite relation between the harvest time and the degree of yield decrease due to mixture.