夏直插花生高产生育规律的研究

1987～1994年在山东省泰安、临沂、莒南等地设点研究。夏直播覆膜花生生育期108d，大于10℃有效积温1513℃·d。叶龄与器官发育进程有一定对应关系。主茎高呈“S”型生长曲线。结荚中期LAI峰值达4．5，产量形成期平均LAI3.42。7月中始花，7月31日前为有效花期。8月10日前为有效针期。7月底开始形成幼果，9月初开始形成饱果。与春花生相比，夏直插花生的生育特点是，苗期短，有效花期短；饱果成熟期短，前期生长发育速度快，产量形成期分配系数高。

THE GROWTH DYNAMICS OF HIGH-YIELDING SUMMER GROUNDNUT SOWN DIRECTLY AFTER WHEAT HARVESTING

A series of experiments on sumrnr groundnut sown directly after wheat harvesting (SGSD) was conducted on irrigated land. An average yielding was over 6 t/hm2.The highest yield of 6.65t/hm2 was achieved on 2.7hm2. The growth period of SGSD was about 108 days. The grow-th dynamics of the main stem height closely follow a sigmoid curve. Final height of the main stem was about 52 cm. The LAl of SGSD occurred a peak (4.5) in the drid pod-setting phase. SGSD started flowering in the mid July. The effective bloowhng stage was 15~20 days. SGSD started formation of young pods in the end of July. The young pods developed to becorne mature pods in the early Suptember. The results indicated that SGSD had a shorter growing season, young seedling phase, effective bloodring stage, pod-maturity phase, and more rapid rate of groWth and development in the early season, higher partitioning percentage during the yield formation phase compared with spring groundnut.