Cultivation for Seed Production of the Black-seeded Soybean “Tambaguro” for Edamame (Green Soybean) “Murasakizukin 3” in Kyoto Prefecture

Abstract

We tried to develop a cultivation method to obtain many seeds with a high germination rate in black-seeded soybean "Tambaguro" for Edamame (green soybean) cv. “Murasakizukin 3” in Kyoto prefecture. When “Murasakizukin 3” was sown at a later date, the winnowed grain yield was lowered, but the yield was increased due to the decrease of seed coat cracking, and the germination rate was high. From the results of this study, the best sowing time to obtain a stable high percentage of germination was after July 5–10 in Kyoto Prefecture. When the planting density was in the range of 3.1 to 6.3 hills m^–2, the winnowed grain yield increased with the increase in the planting density. When white-surface black-underside double multi was laid, the winnowed grain yield increased further, due to the increase in the hundred winnowed grain weight. This was considered to be due to the retention of soil moisture. However, the effect of foliar application of Ca and urea during the ripening period for the percentage of germination and yield was not clear.