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掌握除草剂的选择这种选择性具有不同的作用方式,有些除草剂喷施茎叶后,由于杂草与蔬菜掌握除草剂的选择形态结构上的差别造成吸收药物的多少和速度不同所产生的杀草效果被称为生理选择性。有些除草剂在部分植物体内具有分解作用或由无毒转化为有毒的物质,从而形成生化的选择性。有些是灭生性的除草剂,任何植物凡接触到药剂都能被杀死。但我们可根据杂草与作物出苗的时间差,根系分布的深浅不同使用此类除草剂便会产生一定的时差和位差选择性。除草剂的杀伤对象不同季节,杂草类型不同,不同的蔬菜地杂草类型各异。如春季一般田块的杂草主要是早熟禾、看麦娘、蔼菜、马唐、灰绿黎等;而夏季菜地一般主要的杂草为马唐、牛筋草、狗尾草、野苋、繁缕,马齿苋、小蓟、灰绿黎等。不同的杂草及蔬菜对除草剂的敏感性不同。如杀草胺对单子叶杂草有特效,对阔叶杂草几乎无效。相反阔叶净对阔叶植物杀伤
Grasp the choice of herbicides This selectivity has a different mode of action, some herbicides spraying stems and leaves, due to weeds and vegetables to master the choice of herbicides on the morphological differences caused by the number and speed of absorption of drugs produced by different Grass killing effect is called physiological selectivity. Some herbicides in some plants with decomposition or non-toxic into toxic substances, thus forming a biochemical selectivity. Some are biocidal herbicides, and any plant that comes into contact with the agent can be killed. However, according to the time difference between emergence of weeds and crops and the different depths of root distribution, the use of these herbicides will produce certain time difference and bit-difference selectivity. Herbicide killing objects in different seasons, weeds of different types, different types of vegetable weeds vary. For example, the general weeds in spring are mainly bluegrass, maidenhair, Amanita, crabgrass, ash green and so on; while the main weeds in summer are Crabgrass, Gyps tendon, Setaria viridis, Chickweed, purslane, thistle, gray-green and so on. Different weeds and vegetables have different sensitivities to herbicides. Such as herbicides on monocotyledons have special effects, broad-leaved weeds almost ineffective. On the contrary broadleaf net broadleaf plant killing