岡山県北部における春播きと短日処理がダイズ品種'丹波黒'のエダマメとしての収穫期および収量に及ぼす影響(発育制御)  [in Japanese] Effect of Spring Seeding and Short-day Treatment on Harvest Time and yields of Soybean Cultivar 'Tanbaguro' as Green Soybean in the North of Okayama Prefecture(Growth Regulation)  [in Japanese]

'丹波黒'エダマメの早期収穫を図るため,早期播種および開花初期の短日処理を検討した.1998年3月1日から15日の間に播種すると,7月上旬に収穫できた.また,総収量は播種期が早いほど多かった.一方,3月25日以降に播種すると,7月中に収穫することはできなかった.2001年の試験では3月上旬に播種しても,収穫期が8月中旬となった.これは,開花前の気温が1998年に比べて低かったためと考えられた.しかし,開花初期に5日間短日処理すると,安定して莢の肥大が進み,7月上旬に収穫ができた.処理日数が長くなるほど収穫開始は早くなったが収量は減少した.

Seeding time and short-day treatment in an early period of flowering of 'Tanbaguro', a late bearing soybean cultivar, were evaluated for summer harvesting. When the plant was seeded between March 1 and 15, 1998, it could be harvested in early July. The total yield was higher as the seeding time was earlier. However, when it was seeded on or after March 25, it could not be harvested in July. In 2001, the harvest time was mid-August even when the plant was seeded in early March, probably because the temperature before the flowering period was lower in 2001 than in 1998. However, when short-day treatment was performed for 5 days in the early flowering period, the pods enlarged steadily, and the plant could be harvested in early July. As the short-day treatment period was prolonged, harvesting could be started earlier, but the yield decreased.