麦茬复播大豆生育进程、干物质积累及产量形成规律研究初报

研究表明：①麦茬复播大豆（晋豆20号）从7月对日至8月20日是一生中植株高度增长最快的时期，平均每天增高2.14cm，8月30日达到最高值；②7月20日至8月3日是叶龄发育最快的时期，平均每2．5d增加1个叶龄，8月20日达到最大叶龄;③8月5－20日为荚果形成的高峰期，8月24日左右达到最高值;④麦茬复播大豆全株干物质积累的高峰期在8月19目前后，在前后14d内积累的干物质占一生积累的干物质总量的35．8％；⑤荚果干物质积累的高峰期为9月2日前后，在此前后14d内积累的干物质占荚果总干重的52．5％。

Preliminary Studies of the Growth,Dry Matter Accumulation and Its Yield Formation Rule in Successive Soybean after Winter Wheat

In this study, the result indicated. ① the fasthet peried of plant heigh increase for suceessivesoybean after wheat was from July 23 to August 20, average increase 2. 14cm/day, up to the final heighton August 30. ② the fastest period of leaf-age development was from July 20 - August 3, arerageincrease 1 leaf/2.5 days. up to the maximum leaf-age on August 24. ③ the peak period of pod formation was from August 5-August 20, up to the highest value on August 24,or so. ④ the peak periodof the dry matter accumuation for the whole plant was about August 19,or so. Within 14 days, the drymatter accumulation made up 35.8% of the lifetime. ⑤ the peak period of pod dry matter accumulationwas September 2 or so, within this period, the pod dry matter accumulation made up 52.5% of the totaldry pod weight.