小麦苗期镇压的增产效应

EFFECT OF YIELD INCREASED BY PRESSING-DOWN WHEAT AT SEEDLING STAGE

在贵州的生态环境下,小麦分蘖多而成穗率低,麦苗易出现年前拔节与旺长倒伏,产量低而不稳。为了改变这一状况,提高小麦产量,我们于1982～1983,1984～1985,1988～1989年进行了小麦苗期压麦试验。结果在总蘖数不增加的情况下,分蘖成穗率提高1.27～10.65％,有效穗数增加11.9～28.56％,比对照增产11.2～19.3％,兼有防早拔节、控旺长的功能。故苗期镇压是在本地生态环境下的一个良好调控措施。

Under the condition of ecological environment in Guizhou, wheat is liable to multiple tillering with lower effective percentage. As the result,wheat plants are prone to earlier elongation and lodging for excessive growth with low- and unstable yield.Therefore.the trial of pressing-lown wheat at seddling stage was carried out in order to change this situation and increase yield. The results showed that the effective tiller percentage increase by 1.27-10.65%, the effective norm of ears 11.9-28.56%, be higher 11.2-19.3% thanthe treatment in the yield. This practice also had the function of preventing wheat plant from early elongating and excessive growing. Thus the method of prssing-down wheat at seedling stage is a better in such a kind of ecological environment as Giuzhou.