콩 播種期에 따른 開花ㆍ成熟期 및 種實重의 品種間反應 差異

Varietal difference of flowering, maturity and yield in response to planting time in soybean

This experiment was carried out to get the varietal difference and year variation in flowering, maturity, and grain yield per plant for two years, 1991 and 1992, in response to five planting times each year from April 20 to July 10 with twenty days interval in fifty-five soybean varieties. The results were summarized as follows: Days from planting to flowering(DPF), flowering to maturity(DFM), planting to maturity(DPM), and grain yield per plant showed the highly significant variation for year, planting time, variety and planting time×variety. The variation of DPF and DPM by planting time was larger in early planting than late planting. The standard deviation(SD) of DPF was 11.4 at early planting, 4.0 at late planting, while the SD of DFM was 10.6 at early planting and 9.1 at late planting. The shortening degree of DPF by late seeding was small in early varieties and large in late varieties. Also, the early varieties showed less shortening in DPM duration by late seeding compared to the late maturing varieties. Yield per plant at early planting from April 20 to May 30 was almost same, but those at late planting from June 20 to July 10 was rapidily decreased.