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除草剂为什么只杀杂草而不伤害作物?为什么对某些作物安全而对另一些作物有伤害呢?回答这个问题要从植物的形态特征、生长发育习性、生理生化特性和除草剂的理化性质来分析,下面着重讨论几个问题。 一、植物的形态特征与除草剂选择性的关系。 除草剂能否杀死植物,首先取决于剂液进入植物体内的多少。药剂必须紧密均匀的附着在植物茎叶的表面上,才能触杀或渗入植物组织内部而发挥毒效。但由于植物的形态特征不同,人们常常把它作为除草剂灭草的重要依据。 1.生长点的位置。双子叶植物的生长点
Why do weeds only kill weeds without harming crops? Why is it safe for some crops while others harmed? Answer this question from the plant morphological characteristics, growth and development habits, physiological and biochemical characteristics and the physical and chemical properties of herbicides To analyze, the following discussion focuses on a few questions. First, the morphological characteristics of plants and the relationship between herbicide selectivity. Herbicides kill plants first and foremost, depending on how much of the solution enters the plant. Pharmacy must be closely attached to the surface of plant stems and leaves in order to touch or infiltrate the plant tissue to play toxic effect. However, due to the different morphological characteristics of plants, it is often used as an important basis for weeding herbicide. 1. The location of the growth point. Dicotyledon growth point