In recent years, the application area and application rate of herbicides in agriculture have increased year by year, which has brought greater convenience to farmers and saved a lot of agricultural time. However, due to human factors, improper application of herbicides also brought to farmers. A lot of troubles have adversely affected production. In the recent period, similar problems on the Internet have increased. I have found some relevant information, and I have also learned about some old farmers. I am teaching you a few tricks. First, improper storage, blind misuse. Due to improper storage of the herbicide, the label of the package is detached or the label is corroded. It is not clear that the herbicide is used as an insecticide or a bactericide, or is not applied according to the label of the herbicide, causing phytotoxicity. Prevention method: Keep the herbicide properly and prevent the packaging label from falling off. If the label is found to be missing, a new label should be attached immediately to indicate the name of the herbicide and the method of application. Second, the amount of drug used is too much, and the concentration is too large. The application amount and concentration of the herbicide are more strict than the insecticide and the bactericide. Each herbicide has a prescribed amount. For example, if the amount of superstar is too large, it can cause phytotoxicity to wheat. Prevention method: Strictly control the amount and concentration of herbicides. If necessary, irrigate and degrade before the effect of the drug, destroy the soil layer or contact the manufacturer for remedy. The third is improper use of drugs. Once the herbicide is applied improperly, it will cause phytotoxicity. For example, when many herbicides are applied to the seeds, they are susceptible to phytotoxicity; in the case of sensitive crops and high winds, the herbicides are sprayed, and a large amount of dew drops drift on the sensitive crops to cause phytotoxicity. Prevention methods: According to weeds, herbicides, environmental conditions, choose different application methods, master the technical points of safe and efficient application of herbicides, and do the right medicine. The fourth is to blindly mix pesticides. The herbicide mixture can improve the herbicidal effect, treat diseases, insects and grasses, save medicine, and has the advantages of labor saving, time saving and money saving. However, if blindly mixed, it will not only have no synergistic effect, but will reduce the efficacy and cause phytotoxicity. Prevention method: It is forbidden to use the herbicide. Mixed pesticides should be mixed, observed, tested for efficacy and phytotoxicity. According to the test, the common varieties that can reduce the efficacy after mixing, and the occurrence of phytotoxicity are: propanil and organophosphorus, carbamate pesticides; mixed with grass and bentazone; mixed with metformin and acidic pesticides; Stabilizing and mixing with bentazon can cause phytotoxicity. When mild phytotoxicity occurs, farmland management should be strengthened, loose soil, water accumulation, fertilizer application and growth promoters should be restored to restore crop growth and avoid loss of phytotoxicity. For heavier phytotoxics, targeted remedial measures should be taken immediately on the basis of identifying the causes of phytotoxicity: if cotton is harmed by dimethyltetrachloride, it can be topped and re-topped, so that the remaining leaves can grow new branches. , cultivating new strains, while saponin and sodium nitrite promote growth; after the rice seedlings are harmed by dimethyltetrachloride, immediately apply lime and ash to detoxify, spray 920, foliar fertilizer to promote the growth of rice seedlings as soon as possible . If the smear rice field kills the herbicide, it should be drained immediately, and then drained and drained. For the farmland where chlorsulfuron, metsulfuron-methyl and other leaching agents are toxic, immediately fill the water, and the quick-discharge speed is used for leaching. If it is a sulfonylurea herbicide, it can spray naphthalic anhydride and alizarin lactone immediately, and then add acid fertilizer ammonium sulfate and superphosphate to pickle. For herbicides with low mobility in the soil, such as trifluralin, it can deepen the soil, turn over the soil, promote its volatilization, dilute the residual drug with more soil, and increase the application of organic fertilizer to promote microbial degradation. . Indochazine medicinal damage, such as small phytotoxicity, can be changed, replanting large seeds or large potatoes to reduce losses; spray photosynthetic accelerator: alizarin lactone And foliar fertilizer. Herbicides are classified into selective herbicides and non-selective or herbicidal herbicides according to their ability to identify crops and weeds. In some books, the selectivity of herbicides is divided into six categories: position selectivity, time difference selectivity, morphological selectivity, physiological selectivity, biochemical selectivity, and protective substances or safener selectivity. In fact, this has the selectivity determined by the characteristics of the drug itself, and the different application methods and effects for crop and weed differences. It should be a selective use technique. Let's talk about non-selective herbicides, also called killer herbicides. The masses are called "one sweeping light." Glyphosate, paraquat (chlorine), sodium pentachlorophenol, etc. can only be used when there is no crop in the field, and can be sown or transplanted after the agent is inactive. It should be noted that the speed of these herbicides is reduced, and the temperature is often reduced when the temperature is high, the soil does not retain water, and the rainfall is slow. In fact, this is already the difference in the time to start using crops and weeds, and it is also a technique that uses time difference selection. If the difference in the distribution of crops and weed seeds and roots in the soil is used, the agent is spread on the surface of the soil by 1 to 2 cm, which can kill or inhibit the weed seeds that can germinate in the shallow layer, while the crops (such as wheat) or fruit trees The roots are deep and unaffected. For example, after soy sowing, alachlor (lace) is used before sowing, and corn, cotton, soybean, peanut, wheat and other crops are pre-emerged with acetochlor after sowing. It should be noted that in the soil sand, the organic matter content is low, in the case of rainfall or the formation of stagnant water, the agent may penetrate downwards, prone to phytotoxicity. Seeds that are sown shallower, such as some vegetable fields, are not suitable for use with such agents. By the same token, if you are spraying paraquat in an orchard, you must choose a windless weather, preferably when the airflow rises in the afternoon is not obvious, so that the weeds sprayed onto the ground by the medicament will not drift to the leaves of the fruit trees. Or outside the orchard. The third is to use the difference in the morphology of crops and weeds, typically using 24-butyl butyl ester. The drug is a hormone-selective herbicide. The low concentration has a stimulating effect on plant growth, and the concentration is high and inhibits or even kills. One of its selective weeding effects is that the growth points of the grass crops are covered by layers of leaves, while the growth points of the dicotyledon weeds are always exposed. Thus, under the same spraying conditions, the growth point of the dicotyledonous weeds is higher, which causes distortion or inhibition. When using such a drug, pay attention to the application time. It is not advisable to use the drug before and after the jointing of the wheat. Otherwise, the wheat will also form a deformed ear. It is also necessary to spray the windless weather to prevent the pesticide from drifting to the surrounding vegetables or melons and fruit fields. After spraying, the equipment must be carefully cleaned to avoid affecting other farmland. Like the use of props in rice fields, it is due to the difference in the biochemical reactions of the chemicals in rice and alfalfa. Rice can rapidly hydrolyze the enemy, which is arguably true selectivity. Similar herbicides such as rice Honda use He Da Zhuang, corn fields use simazine and atrazine, soybean fields use fensulfuron, and carrot fields use trifluralin. They are safe to use in the appropriate fields, but they can be plagued by the wrong field or excessive residue. Metal Crafts,Wire Mesh Deep Processing,Mrtal Wire Mesh Yishen Wire Mesh Products Co., Ltd. , http://www.hsgabionmesh.com