我省地处中原,夏季降雨量较大,气温较高,既有利大豆、玉米、芝麻、花生、棉花等夏季作物的生长,也有利于各种夏季杂草的滋生和蔓延,所以控制杂草危害是我省夏播作物实现一优双高的重要环节,必须认真抓好。 一、夏播作物地杂草优势种及其危害 据调查,我省夏播作物地杂草种类很多,其优势种为牛筋草、稗草、狗尾草、马唐、大画眉草、野苋、刺苋、马齿苋、小藜、龙葵、铁苋菜、田旋花、野茼麻、苍耳、小蓟等十几种。这些杂草的发生高峰期在6月中下旬,生长旺盛期在7月份。此时夏播作物正处在幼苗期,根系小,长势弱,而杂草密度大,根系发达,长势旺。加之这一阶段雨天较 The province is located in the Central Plains, the summer rainfall is larger, the temperature is higher, not only benefit the growth of summer crops such as soybean, corn, sesame, peanut, cotton, but also conducive to all kinds of summer weeds breeding and spread, so weed control Harm is the summer sowing crops in our province to achieve an excellent high and an important link, we must seriously do a good job. First, the summer sowing crop weed dominant species and its harm According to the survey, the province of summer sowing crops to weed species, the dominant species of tendon grass, barnyard grass, Setaria, crabgrass, large thrush grass, wild amaranth, Amaranthus, purslane, quinoa, Solanum nigrum, iron amaranth, Convolvulaceae, wild Aglaia, cocklebur, thistle and other dozen. The weeds peaked in late June and peaked in July. At this time summer sowing crops are in the seedling stage, small roots, growing weak, and weeds density, root system, prosperous. Coupled with this phase more rainy days