Response of growth, yield and grain quality of black soybeans as a function of different seeding dates and planting density
Kim, S.K.; Kim, D.H.; Son, B.Y.; Kang, D.J.; Shin, W.K.; Han, K.S.
RDA Journal of Crop Science 39(2): 39-45
Recently, demand and planting acreage of black soybean has been increasing because of its various use for cooking with rice, boiling soysauce, confectionery, medicinal use, and stuffing rice cake. Nevertheless, cultural technique for stable production, e.g. optimum seeding date and planting density, is not established. To elucidate the changes of growth characters. yield components and yield as affected by different seeding dates and planting densities, small grain Hamyang landrace and large grain Gumgeongkong 1 were experimented. Flowering and fruiting days were shortened by 16apprx17 days and 4apprx7 days when seeded late, respectively. Stem length. branch and pod number and yield were varied largely in different seeding date and planting density combination. Highest yield of Hamyang landrace was shown when seeded at May 22, but there was not significant difference in Gumgeongkong 1. Optimum planting density was regarded as 60 X 10 cm, one plant per hill for Hamyang landrace and 60 X 20 cm, one plant per hill with Gumgeongkong 1, respectively. Perfect grain rate was higher at late seeding than that of early seeding in both cultivars. It showed good seed uniformity at May 22 seeding with Hamyang landrace and at June 15 seeding with Gumgeongkong 1.