麦子与杂草同生于生态区域内,必然引起两者对生存空间的竞争。两者竞争最剧烈的时候,就是杂草对麦子质量影响最大的时期,同时也是麦田杂草防除的最佳时期。为了摸清最佳防除期,我们于1989～1990年,以麦田阔叶杂草为对象,对防除最佳期进行了初步研究,现将结果整理如下: 一、研究方法本研究采用分期人工拔草的方法,以产量结构为指标,比较不同时期除草的增产效应。 Wheat and weeds living in the same ecological region, will inevitably lead to competition between the two living space. The two most competitive when the weeds is the most affected wheat quality period, but also the best weed control wheat field. In order to find out the best control period, from 1989 to 1990, we took the broadleaf weed in wheat field as the object, and carried out the preliminary study on the best period of control. The results are summarized as follows: I. Methods of study In this study, Grass method, the yield structure as an indicator to compare the different period of weeding effect of increasing yield.