试验分1983和1984两年进行.前茬分别为中糯、中粳稻,质地沙壤,地力中上.供试品种为扬麦4号小麦,10月底播种,播量每亩20斤,基本苗每亩12方左右.按镇压时主茎叶龄设七个处理:Ⅰ.主茎3+4叶期(冬前);Ⅱ.主茎5+6叶期(越冬期);Ⅲ.主茎7+8叶期(返青拔节期);Ⅳ.主茎3+4+5+6叶期(冬前+越冬期);Ⅴ.主茎5+6+7+8叶期(越冬+返青拔节期);Ⅵ.主茎3+4+7+8叶期(冬前+ The experiment was carried out in 1983 and 1984. The former crop was middle waxy, middle japonica rice, texture sandy soil, middle and upper soil.The tested varieties were wheat variety Yangmai 4, sown at the end of October, the sowing rate was 20 pounds per acre and the basic seedlings Each mu about 12 .According to the suppression of the main stem and leaf age set seven treatment: Ⅰ. Main stem 3 +4 leaf stage (before winter); Ⅱ. Main stem 5 + 6 leaf stage (overwintering); Ⅲ. Main stem 7 + 8 leaf stage (returning to green jointing stage); Ⅳ. Main stem 3 +4 +5 +6 leaf stage (before winter + winter); V. Main stem 5 +6 +7 +8 leaf stage Period); Ⅵ main stem 3 +4 +7 +8 leaves (pre-winter +