Scientific use of herbicides to prevent pesticides
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In production practice, the same herbicide can even be used in different regions and under different conditions, even in the same dose. Therefore, improving the use of herbicides and preventing the occurrence of phytotoxicity has become the primary problem of chemical weeding in farmland. How to prevent the occurrence of herbicide phytotoxicity?
One is to prevent misuse
There are many varieties of herbicides, and one variety is often produced by many manufacturers. The names of the products are varied, and many drugs are easily misused due to wrong names. This requires the majority of farmers to be clear when buying, is a dry field herbicide or a herbicide in rice fields. If a dry field herbicide such as "alachlor" is used as a butachlor, the word will be out of production. Therefore, the selection of herbicides should not only pay attention to the name, identify the three certificates, but also pay attention to similar types of outer packaging, similar names of fake and inferior pesticides, misleading consumers to use, causing phytotoxicity.
The second is to prevent improper use.
Excessive dosage, improper application period and improper use are often the main causes of phytotoxicity. The herbicide does not exceed the requirements of the instructions. For example, the herbicide butachlor in the paddy field is sprinkled with toxic soil after being inserted, more than 150ml per mu, the seedling is weak, not green, and when the water layer is too deep, the rice can be inhibited. Growing and tilling, even dead seedlings. For the rice field weeding, it is necessary to strictly control the dosage and application conditions. The temperature must exceed 28 degrees and the dosage should be appropriately reduced. Ultra-high-efficiency herbicides such as bensulfuron-methyl and pyrazosulfuron-methyl have high herbicidal activity and are easy to produce phytotoxicity. Butachlor is safer to apply toxic soil after rice is greened. However, if it is combined with land preparation before insertion, it will inhibit rice growth, delay tillering, encounter low temperature, abnormal high temperature or too deep water layer, and the disease will be more serious or even die. seedling. For herbicide concentrations in stem and leaf sprays that are too large, repeated sprays can also cause local phytotoxicity.
The third is to prevent residual phytotoxicity
Those herbicides that have long-lasting degradation in the soil should be carefully adjusted when planting the structure and replanting the crops. First, find out what kind of herbicides are used, what herbicides are used, and how long the residual effect period should be. The safety of the crops after the crop. Try not to use long-lasting herbicides.