Q: Wu Jiansheng, Hefeng Town, Sishui County: There are two direct-flowing rice fields with a total of 2.6 mu of land. The emergence of seedlings is good. In the last few days, the seedlings have yellowed leaves and the plant strain rate reaches 100%. Some plants die. Sprouts are sown, and soil is closed with benzacetazone after sowing. The former crop was wheat, and the wheat field had used 20% chlorsulfuron wettable powder 5 grams per acre to weed control. Rice seedlings are the phytotoxicity of that herbicide? How to remedy?
Answer: Normal use of benzacetimidide after germination of rice seedlings will not cause adverse effects on rice. Chlorsulfuron is a long-lived herbicide with a residual period of 2 to 3 years in soil. It is limited to use in wheat fields with neutral and acidic soils in the rice-wheat rotation area of ​​the Yangtze River. In the acidic soils of southern Jiangsu and other places, chlorsulfuron used in wheat bran tends to decompose and generally does not cause phytotoxicity to rice. However, after successive application of these herbicides, the residual amount in the soil will increase and cause drug to rice. harm. The use of chlorsulfuron in wheat fields does not allow direct seeding of live rice, which may cause phytotoxicity to rice seedlings. The phytotoxicity showed that the growth of rice roots and shoots was blocked, the heart leaves could not be extracted, the growth spots were malformed or necrotic, the leaves were dark green or chlorotic necrotic, the internodes were shortened, the fibrous roots were small and aged, the growth was stagnant, and the plants were dwarfed and yellowed. Finally withered. The above-mentioned rice seedlings have yellow leaves and dead plants, which is likely to be harmed by residual chlorsulfuron. Rice is harmed by chlorsulfuron, and the application of naphthalene dianhydride and streptozocin has a certain harmful effect. The application of acidic fertilizers such as ammonium sulfate and superphosphate for pickling is better. If seedlings are particularly affected, transplants from other direct seeding rice fields should be considered.
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