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各种农药对作物具有不同的生理作用,使用时所需有效浓度、剂量也就不同。会不会发生药害,一般以发挥防治效果所需的最低浓度或剂量和作物对农药最高耐受浓度或剂量(即发生药害的最低浓度)两个值的差异(即防治指数也是安全系数)来表示安全程度。即:(作物对农药的最高耐受浓度或剂量)/(农药对有害生物的最低有效浓度或剂量)=化学防治指数化学防治指数越大,对作物越安全,化学防治指数小于1的药剂,肯定会发生药害。
Various pesticides have different physiological effects on crops, the effective concentration required when used, the dose is different. Will phytotoxicity occur, usually in order to exert the control effect of the minimum concentration or dose and the highest concentration of pesticides on crops or pesticides dose (ie, the minimum concentration of phytotoxicity) of the two values ?? difference (that is, the control index is also a safety factor ) To indicate the degree of safety. Namely: (the highest concentration or dose of crop to pesticide) / (the lowest effective concentration or dose of pesticide to pest) = chemical control index The bigger the chemical control index, the more safe the crop, the chemical control index is less than 1, Surely there will be phytotoxicity.