2023 Volume 92 Issue 1 Pages 41-47
According to the analysis of yield data from 2016 to 2021, the economic yield of soybean cultivar 'Satonohohoemi' grown in Saitama prefecture was mainly determined by biological yield, and the effect of harvest index was very small. Therefore, the evaluation of soybean cultivation should be conducted by total weight measurement and growth analysis, not by decomposition into yield components. It was considered that the low biological yield of soybean in Saitama was caused by the insufficient leaf area index of the soybean canopy. As a countermeasure, sowing earlier or dense planting in late sowing was considered to be effective. However, the area where early sowing can be introduced is limited due to work conflicts with rice and wheat, and the amount of seed supply is insufficient for late dense sowing. Therefore, it was considered that a cultivation system in which the amount of seed left over from early sparse sowing was used for late dense sowing would be more realistic.
