Pesticide compounding should be scientific
Regulating valve is a fluid control device, it can control fluid flow, pressure, temperature and other parameters, in order to achieve the purpose of regulating fluid flow characteristics. It is composed of a piston or ball spool, in which there is a manual or electric mechanism with adjustment function, it can control the position of the piston or ball spool, so as to change the pressure and flow rate in the valve, so as to adjust the flow characteristics of the fluid.
The main function of the regulating valve is to adjust the flow rate, pressure and temperature, so that the fluid flow characteristics are more stable, so as to improve the efficiency of the fluid. It can regulate the flow of fluid to keep it at a low level, thus saving energy; The pressure of the fluid can also be adjusted to keep it at a low level, thus reducing noise in the piping system; The temperature of the fluid can also be adjusted to keep it at a low level, thus preventing condensation in the piping system, etc.
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First, the type of compound
1. Insecticide plus insecticide: It is the combination of insecticides of different types and different modes of action. At present, there are mainly organophosphorus and organophosphorus, organophosphorus and pyrethroids, organophosphorus and carbamate. Classes, organic nitrogen and carbamates, organic nitrogen and pyrethroids.
2. Insecticide plus fungicide: This type mainly plays a role in insecticide and bactericidal treatment.
3. Fungicide plus fungicide: Generally, a fungicide with a systemic therapeutic effect is used in combination with a protective fungicide. The systemic fungicide can be absorbed by plants and transmitted to various parts of the plant to play a bactericidal effect; the protective fungicide can not be absorbed by plants, but remains on the surface of the plant to prevent the invasion and infection of the bacteria.
4. Herbicides plus herbicides: generally match the long-lasting and short-term herbicide combinations; mix the systemic herbicides with the contact herbicide; according to the complementary insecticidal spectrum, the herbicides that kill the monocotyledon weeds Mixed with herbicides that kill dicotyledon weeds.
Second, the principle of compounding
1. Principle of synergy: the combination of two or more pesticides has two possibilities: synergy and efficiency reduction. Moreover, the ratio of the two pesticides is different, and the degree of synergy is also different.
2. Toxicity principle: After the pesticide is mixed, the toxicity will not increase, and the continuous efficacy period should be the same or increased, and the residue is not higher than the single agent.
3. Principles of phytotoxicity: Some pesticides are used safely for crops. Mixed use is easy to cause phytotoxicity. When preparing, the safety of crops must be considered.
4. Resistance principle: Selecting pesticides with negative cross-resistance (negative cross-resistance, that is, pests are resistant to one pesticide, while another pesticide is better for pests), at least there is no interaction resistance. Sex (interactive resistance is a pesticide in which a pest produces resistance to one pesticide and resistance to another pesticide). Generally, pyrethroids have no cross-resistance with organophosphorus and organic nitrogen pesticides and can be mixed.
5. Principle of acid-base reaction: Most of the pesticides used in production are neutral or acidic, and can not be mixed with alkaline pesticides such as stone sulfur mixture and Bordeaux mixture to avoid chemical reaction and reduce drug efficacy.
(Excerpt from "Agricultural Supply and Demand News")