검정콩 기계조파시 (機械條播時) 파종시기 (播種時期) 와 밀도가 생육 및 수량에 미치는 영향

This study was conducted to compare the growth and yield, and to determine the optimum planting date and density in two improved black soybean varieties. The two varieties were planted by driller attached a tractor on May 21 and June 19, 1993, and treated five planting densities, respectively. field of Gumjeongkong 1 was similer for both planting dates, but that of Suwon 157 was remarkably reduced on June 19 planting compared to May 21. There was significant differences between planting dates in stem length, number of branches, seeds per plant, seed weight and yield. Planting density, also, significantly affected on stem length, number of branches and seeds per plant. Statistically significant interactions between planting date×variety and planting date×planting density were found at almost all characteristics, except between variety×planting density. Optimum planting date and density of Gumjeongkong 1 for high yield were June 19 and 33,000 plants per 10a, and those of Suwon 157 were May 21 and 22,000 plants per 10a, respectively. The coefficient of variation at different planting densities was high at stem length, number of branches, seeds per plant and yield, but low at number of main stem node, seeds per pod and 100 seed weight.