The effectiveness of some herbicides remaining in the soil after being used for more than one year can easily cause sensitive post-plant crops to suffer different degrees of phytotoxicity, and they must be taken seriously and avoided as much as possible.
First, choose different herbicides according to different soil characteristics, microbial species, climate and irrigation conditions. Herbicides containing chlorsulfuron-containing components are mainly degraded in the soil by hydrolysis. When Daejeon encounters alkaline soil, low rainfall in the year, and soil drought, their residual period in the soil tends to be prolonged, and crops are susceptible to flooding. On the other hand, when acid soils, soils are wet or irrigation farmland, the residual period is shortened. After the crop is relatively safe.
2. Before planting crops after planting, it should be known whether the herbicides applied to the former crop have phytotoxicity on the crops of the rear crop. For example, if herbicides containing chlorsulfuron-methyl, metsulfuron-methyl, such as wheat straw, wheat straw, etc. are used before, then crops such as corn, soybeans, cotton, peanuts, etc. cannot be cultivated, nor can they be used for paddy fields. In recent years, the use of tribenuron (also known as superstar, broad-leaf net) in some places has produced different degrees of phytotoxicity on the mandible peanuts, resulting in difficulties in seedling emergence, slow growth, and reduced yield.
Third, improve the application methods to reduce the amount of soil residues. First, the amount of drug to be accurate, spray should be uniform, do not leak spray, do not re-spray. If herbicides containing chlorsulfuron-methyl components are applied year after year, they will not only cause phytotoxicity to crops but also have phytotoxicity to crops of the current season. The second is that the use period should be flexible. It can be applied before the crop is sown, before the seedlings, or after the seedlings. At present, Pust, Guangmiaoling and Atrazine should use early post-emergence spraying to achieve the purpose of reducing the dosage and reducing the residue. When used after emergence, add additives or synergists to improve efficacy and reduce the amount of medication. The third is rational application of pesticides. The use of chlorsulfuron in combination with 24-D butyl ester can reduce the amount of chlorsulfuron used by 50%. Pussite soil treatment can be mixed with trifluralin, acetochlor, alachlor, saxin and others. Stripe spraying with Pusit and Guangmianling can reduce the dosage by more than 30%.
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