不同时期断根对花生植株生长的影响

为了探明断根时期对花生植株生长的影响，为确定适宜的断根时期提供依据。在大田覆膜栽培条件下，研究了不同时期断根对花生植株生长的影响。研究结果表明，断根可降低花生株高，减少主茎叶片数、分枝数、单株开花数和果针数，且随断根时间的提前而影响明显；适期断根有利于延缓花生叶片衰老，使适宜叶面积系数维持较长时间，增加有效分枝数和有效果针数，并可较少干物质的无益消耗、减少过多的冗余生长，有利于荚果形成；断根过晚基本不影响植株生长。本试验以开花后15~20天进行断根处理对植株生长的综合效果较好。

Effect of Different Stage of Root Cutting on Growing Dynamic of Peanut

In order to study on effect of different stages of root cutting on growing dynamic of peanut, provide theoretical basis for the reasonable stage of root cutting. A field experiment under mulching was conducted to study the effect of different stages of root cutting on growing dynamic of peanut. The results showed that, root cutting could reduce the plant height, number of leaves and branches, number of flowering and needles per plant of peanut, the earlier cutting the root, the more obvious effect was. The reasonable stage of treatments was helpful to delay leaf senescence in peanut, maintain the suitable leaf area index for a long time, increased the effective number of branches needles and less useless dry matter accumulation, reduced the excessive growth redundancy, in favor of pod formation; Later treatments caused minor damage to roots of peanut; there was little effect on redundancy reducing and compensation effect. In this experiment, the fifteenth day to the twentieth day after flowering of root cutting could obtain the best effect on plant growth.