二年生草木樨有越冬后来年早春再生的特性。草木樨翻压来年种春小麦,常发生再生草荒,影响春小麦的生长和产量,是阻碍草木樨绿肥推广的主要因素,群众贬称为“万年脏”。为了解决这个问题,从一九七八年我站在永昌县水源公社北地大队进行了秋天喷洒2,4—D丁酯防止再生的试验,获得成功,现总结如下: 一九七八年九月下旬,对水源公社北地大队四十余亩草木樨翻压前每亩用2,4—D丁 Perennial birch have the characteristics of winter regeneration after early winter. Grass and shrubs turn over the spring wheat of the past year, and often lead to the re-birth of grassland and affect the growth and yield of spring wheat. It is a major factor that impedes the promotion of green manure and green manure. The masses derogatoryly call it “dirty for thousands of years.” In order to solve this problem, I succeeded in the experiment of spraying 2,4-D butylate in autumn to prevent regeneration in the northern station of the Water Resources Commune, Yongchang County in 1978. It is summarized as follows: In late March, more than 40 mu of grassland and shrubs of the northern part of the Shuiyuan commune were drained with 2,4-D per mu