In recent years, with the widespread use of chemical herbicides and the evolution of weed communities, the use of a single herbicide has made it difficult to control a variety of mixed weeds. Therefore, more and more people pay attention to the mixed use of herbicides. The combination of herbicides can broaden the herbicide spectrum, increase the herbicidal effect, extend the application period, reduce the phytotoxicity, reduce the residual activity, and delay the occurrence and development of the herbicide resistance. It is an important measure to improve the application level of herbicides. . However, herbicides are not simply mixed randomly. Special attention should be paid to the following points:
Does not affect chemical properties
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 drugs
The physical properties such as emulsification, dispersion, wetting, and suspension that are involved in the mixed herbicide maintain a good state, do not disappear, and do not diminish, and it is better to enhance it.
Extend the effect of weeding range
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. 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.
Increase the number of reductions in retention period
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 WP to prevent annual and perennial broadleaf For weeds and sedges, if 50 grams of butachlor per mu is used in combination, the effect of removing mites can be improved, and the use of pesticides can be achieved once.
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 By reducing the amount of wilt-fertilizer by 3/4, the weeding effect in the corn field can still be guaranteed, and the impact on post-crop crops will be 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. For example, if the herbicides have high activity and are used improperly, they can easily cause phytotoxicity to the crops. In contrast, 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 4 Mixing use before leaf jointing or before the jointing of spring is more than 94% effective against swine fever, which is equivalent to single herbicide, but the cost is reduced by 22.5%. Compared with dimethyl tetrachlorine alone, the deformed spike is reduced by 0.85%. .
Inhibiting weed population changes
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.
According to local conditions, mixed with the first trial
The selection of herbicides and the determination of their dosage should be based on factors such as the type of weeds in the field, the degree of occurrence, the soil texture, the soil organic matter content, the crop type, and the crop growth status. The period and method of use of the herbicide involved in the blend must be consistent.
The herbicidal effect of herbicides after mixed use is influenced by various factors. Prior to application in large areas, tests and demonstrations should be carried out in different proportions and at different dosages, or under specific technical guidance.
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