Does not affect the chemical nature of the drug. After two or more herbicides are mixed, no chemical reaction occurs between the agents, and the chemical properties of the various active ingredients cannot be changed. For example, organic organophosphorus herbicides are prone to alkaline hydrolysis under alkaline conditions, so they should not be mixed with alkaline herbicides or alkaline substances, or they can only be used as they are. For the same reason, acidic herbicides can not generally be mixed with alkaline substances. Many herbicides containing metal ions such as copper, manganese, and zinc often form soluble metal salts under acidic conditions, which may easily cause phytotoxicity or render herbicides ineffective.
Does not destroy the physical properties of the drug. After two or more herbicides are mixed, no chemical reaction occurs between the agents, and the chemical properties of the various active ingredients cannot be changed. The physical properties of the herbicides involved in mixing, such as emulsification, dispersion, wetting, and suspension, remain in a good state and do not disappear or diminish, and they can be better enhanced.
Extend the scope of weeding and increase control effectiveness. At present, most herbicides widely used in production are selective. The use of herbicides with different herbicidal spectrums should be complementary and the mechanism of action should be complementary in order to achieve the purpose of controlling more types of weeds. Before large-area applications, tests, demonstrations, or specific technical guidance should be carried out in different proportions and at different dosages. For example, the combination of acetochlor and atrazine or saxein can significantly expand the scope of weeding; the use of herbicidal ether alone in rice returning green can only control alfalfa grass and calfgrass. For example, when mixed with methamphetamine, It can control the dicotyledonous weeds such as Sancao grass and wild leeches.
Extend the duration of weeding and reduce the number of medications. When herbicides are used, they should be used in a mixture of a long duration and a short shelf life to provide complementary effects. This will not only control weeds that have sprouted in the early stages, but also basically control the weeds during the whole growing period of the crop. For example, the use of trifluralin and herbicidal ether in the cotton field can generally prevent grass damage in the whole growth period of cotton; it can be used for early post-emergence treatment in paddy fields with 10% rice straw-free wettable powder, which can prevent annual and perennial growth. For weeds and sedges, if 50 grams of butachlor per mu were used in combination, the effects of herbicide removal could be improved, and the use of pesticides could be achieved at one time, and the purpose of rice fields could not be harmed.
Reduce phytotoxicity and increase safety. Some herbicides have a long residual period and are likely to cause adverse effects on the crops under the crop. For example, wilt is used to control weeds in corn fields. It is very safe for corn and has good weed control effects. However, it cannot be used to sow sensitive crops. Otherwise, the injury is very serious. If you use alachlor and wilt The reduction in the amount of wilt-fertilizer by 3/4 still ensures the weeding effect in the corn field, and the impact on the post-planting crop is greatly reduced.
Reduce costs and increase efficiency. Herbicides should be used in combination to reduce the number of medications and dosage, save labor, and reduce production costs. If the herbicides have high activity, if they are used improperly, they are liable to cause phytotoxicity to the crops, and the herbicides and dimethyl tetrachlorine can be mixed and used in half with a single dose, which can overcome the weakness of their single use in pre-winter wheat. The control effect of mixed use before and after the spring stage of the leaf stage was more than 94%, which was equivalent to that of the herbicide alone, but the cost was reduced by 22.5%. Compared with the use of dimethyl tetrachlorine alone, the deformed spike was reduced by 0.85. %.
Inhibit weed population changes and maintain ecological balance. Rational use of herbicides should also have the effect of suppressing population changes in weeds and reducing weed resistance. At the same time, we must also play a role in protecting natural enemies of pests and maintaining agricultural ecological balance.
Mixed with local conditions. The selection of herbicides and the determination of the dosage should be based on factors such as the type of weeds in the field, the degree of occurrence, the soil texture, the content of soil organic matter, the type of crops, and the reproductive status of crops. The period and method of use when the herbicides of different formulations are mixed must be consistent and mixed according to a certain ratio and specific mixing principles.
The herbicidal effect of the herbicide mixture should follow the principle of mixing. Affected by various factors, prior to large-area application, tests, demonstrations, or specific technical guidance should be carried out in different proportions and at different dosages.
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