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The long residue of atrazine, vulnerable to sensitive crops
A reader of Bufeng Town, Tinghu District, Yancheng City, said on December 29, 2010, that the local summer maize of more than 10 mu was sown in early July. After sowing, 42% of Dingojing was used to remove turf and no weeds appeared. problem. After corn was harvested, spinach and transplanted cabbage were sowed in the field. Spinach seedlings and cabbage seedlings were inhibited from growth, and died seedlings of varying degrees. He asked whether the spinach and cabbage were damaged by 42% of diisobutyramine suspoemulsion residue. Kosaiyu of Jinan Kesai Kenonong Chemical Co., Ltd. of Shandong Province hopes that 42% of Dingyizuan to Zunzhu suspension emulsion contains butachlor 4%, isoprofloxacin 20%, and atrazine 18. Registered for spring maize field and summer corn field closed treatment to control annual weeds. The recommended dosage per hectare of pure spring corn field is 1575~1890g, which is equivalent to 250~300ml per mu; the recommended dosage of pure corn per hectare in summer corn field is 1260~1575g, equivalent to 200~250ml per mu. Butachlor is an amide selective pre-emergence herbicide. It is mainly absorbed by weed seedlings and young secondary roots and inhibits protein synthesis in the body, causing swollen and deformed young shoots, dark green color and ultimately death. The drug can be decomposed by soil microorganisms, the effective period of 30 to 40 days, the normal use of post-planting crop security. Propisochlor is a selective herbicide that is mainly absorbed by germinating plant shoots and inhibits protein synthesis. In the soil can be decomposed by the soil microorganisms, the effective period of 60 to 80 days, normal use has no effect on the after-cultivation crops. Both of the above two agents can be used for soil sealing before spinach sowing and cabbage before transplanting. The small amount of butachlor and propiopamine left in the former won't cause phytotoxicity to spinach seedlings and cabbage seedlings. Atrazine is a selective system for internal absorption of pre-emergence and post-emergence herbicides. It is mainly absorbed by the root system, with little stem and leaf absorption, and can be quickly transferred to the weeds meristem and leaves to interfere with photosynthesis and make weeds. death. The half-life in the soil is 35 to 50 days, and the half-life in groundwater is 105 to 200 days. Atrazine has a long duration of effect and can easily cause damage to sensitive crops such as soybeans, rice, beets, rapeseed, flax, watermelon, melon, wheat, barley, and vegetables. Production should be controlled by the amount of drugs used, or mixed with other herbicides to reduce the amount of drugs to avoid harm to the crop after the crop. Spinach and cabbage are sensitive to the drug, and residual drugs may cause phytotoxicity to spinach and cabbage. After the sensitive crops of after-cultivation are damaged by residual atrazine, if the area of ​​pesticide damage is small, the soil can be changed and replanting large-grained seed crops or large potatoes to reduce losses. Spraying drugs such as alizarin lactones and sodium nitroprusside to promote growth will help alleviate drug damage. It has been reported that the spraying of 8 mg/L of sodium propionate sodium can relieve 0.6 mg/kg of residual atrazine in the soil and cause harm to soybeans; the sodium propionate and wet earth are uniformly mixed in 1:4 and used for rice. The seedlings were rooted at a rate of 0.05-0.2 g per plant and were inserted into a field with a residual concentration of 0.6 mg/kg of atrazine, and rice could grow normally. Polyamines, spermine and ammonium nitrogen can reduce the adverse effects of atrazine on crops.