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Guiding Opinions on Northeast Corn Structure Adjustment
[ China Agricultural Machinery Industry News ] At present, the Northeast region is about to enter the critical period of spring ploughing. In order to implement the "Guiding Opinions of the Ministry of Agriculture on the adjustment of corn structure in the "sickle bend" area", effectively prevent the risk of pesticide residues in the crops from the long-lasting residual herbicides of Atrazine, and ensure that the structural adjustment is adjusted and stable, the Ministry of Agriculture The Plantation Management Department and the National Agricultural Technology Extension Service Center will organize relevant experts to conduct special research and propose the following technical guidance.
Guiding Opinions on Northeast Corn Structure Adjustment
First, rational layout and crops. The area where the corn planting structure is adjusted should be arbitrarily adjusted according to the situation in which the corn field is applied in recent years. First, continuous application of atrazine and its compound preparations for more than 3 years in corn fields, after the adjustment of silage corn or fresh corn; after continuous application for less than 3 years, the rear can be adjusted to grow silage corn, fresh food Corn, sorghum, scorpion or scorpion; after 1 year of decommissioning, other crops can be gradually adjusted. Second, the former sputum uses nicosulfuron-methyl and mesotrione to replace the field of atrazine, and the sorghum can be adjusted to grow silage corn, fresh corn, potato, spring wheat, soybean, rice, peanut, sunflower, miscellaneous grains, miscellaneous beans. , ramie, rapeseed, beet, flax, melon, vegetable, fruit tree or forage, and other crops; for two consecutive years, the use of benzopyrazone, nicosulfuron and the like to compound with atrazine, the implementation of atrazine In the reduced corn field, various crops other than beets can be grown. The third is the use of oxazin and acetochlor in combination with weeding, and the sorghum can be used to grow silage corn, fresh corn, potatoes, soybeans or peanuts.
Second, scientific selection of herbicide varieties. In areas where the corn planting structure is to be implemented, the herbicides with short soil residual period, no structural adjustment and crop growth should be selected according to the local grass phase, soil and climatic conditions, and the use of structurally modified crops should be avoided. Atrazine at risk and its compounded preparations. For pre-emergence soil treatment after sowing, acetochlor, metolachlor, propisochlor, pendimethalin, etc. should be used to control grass weeds, as well as oxasulfuron, isoxaflutole, and oxazin. Ketone, terbutin, etc. to control broadleaf weeds. After spraying, the chloroflupiric acid (isooctyl ester) and 2,4-D (isooctyl ester) should be used to control broadleaf weeds and nicosulfuron, mesotrione and phenylpyrazin. Control grass weeds and broadleaf weeds. At the same time, the treatment method should be selected according to the soil moisture and climatic conditions, and according to the composition of the weed population in the field, rational mix should be used to expand the spectrum of killing grass.
Third, promote the technology of the trip to Tianjin. In view of the fact that Atrazine prevents weeds in the corn field and is cheap, and it is difficult to replace it in a short period of time, it should be promoted to reduce the risk of medicinal damage to the crops. For loamy soils and good lyrical fields, indomethacin and acetochlor can be used for soil treatment before sowing. Atrazine should be strictly controlled within the recommended dosage to avoid over-use; sand or sloping fields Block, soil treatment should not be used. Post-emergence spraying treatment, the combination of atrazine and nicosulfuron, mesotrione or benzopyrazone was carried out, and the use of atrazine was controlled to be less than 50% of the recommended dose for soil treatment. At the same time, adding functional additives such as methylated vegetable oils to further reduce the amount of atrazine used; the nozzle standard and constant pressure application equipment are used to ensure uniform application and increase the herbicidal effect after reduction.
Fourth, timely resolution of the risk of phytotoxicity. According to local conditions, measures such as adding organic fertilizer, adequate irrigation before planting, accelerating the degradation of atrazine in the soil, or adopting seedling transplanting, etc., to prevent the risk of herbicide residues on the corn planting structure adjustment crops. Once mild phytotoxicity occurs in the field, plant growth regulators such as brassinolide are sprayed in time to reduce the adverse effects on the growth of the replanted crop.
Provided by the Plantation Management Division of the Ministry of Agriculture