This standard specifies the dosage, application period, method, crop variety sensitivity, and safe interval of crops after rotation for 21 sulfonylurea herbicides to control weeds in the field. This standard is applicable to guide the safe, effective and reasonable use of the above sulfonylurea herbicides in rice, wheat, corn, soybean, rapeseed and other crop fields to control weeds, so as to achieve the purpose of increasing production and efficiency. NY 686-2003 Guidelines for the Rational Use of Sulfonylurea Herbicides NY686-2003 Standard Download Decompression Password: www.bzxz.net

NY686—2003
This standard is formulated to guide the scientific, reasonable and safe use of sulfonylurea herbicides, reduce the negative impact of improper use on agricultural production, and enable them to play a positive role in agricultural production. This standard includes the application technology of 21 sulfonylurea herbicides in rice, corn, soybean, rapeseed, lawn, woodland, non-cultivated land, dosage, application period, application method, control target, safe interval between application and subsequent crop sowing, and precautions. Each standard has been developed based on a large amount of data obtained through field efficacy tests in two places for two years or more, combined with the experience and lessons learned from large-scale promotion; through two-year two-point residue tests, the effects of the residues of such long-residue herbicides in the soil on the growth of subsequent crops and the safe interval between the application of the previous crop and the sowing of the subsequent crop were determined by combining instrumental analysis and bioassay, so as to reasonably arrange crop rotation and reduce damage to subsequent crops; ways to maintain efficacy, reduce the amount of pesticides used, improve crop safety, avoid and delay weed resistance, protect the ecological environment, and ensure the yield and quality of harvested agricultural products are formulated based on a large amount of data and information obtained. The technical requirements of this recommendation are more instructive and operational. This standard is proposed by the Ministry of Agriculture of the People's Republic of China. The drafting unit of this standard: Pesticide Control Institute of the Ministry of Agriculture. The main drafters of this standard: Liu Xue, Wei Fuxiang, Jia Fuqin, Zhang Jia. This standard is interpreted by the Pesticide Control Institute of the Ministry of Agriculture. 1 Scope
Guidelines for the rational use of sulfonylurea herbicides
NY686—2003
This standard specifies the dosage, application period, method, crop variety sensitivity, and safe interval of crops after rotation for 21 sulfonylurea herbicides to control weeds in the field.
This standard is applicable to guiding the safe, effective and rational use of the above sulfonylurea herbicides in rice, wheat, corn, soybean, rapeseed and other crop fields to control weeds, so as to achieve the purpose of increasing production and efficiency. 2 Terms and Definitions
The following terms and definitions apply to this standard. 2.1
Sulfonylurea herbicide is a type of herbicide with a sulfonylurea structure in its molecule. The general chemical structure includes three parts: aromatic ring, sulfonylurea bridge and heterocyclic ring: aromatic ring
wherein X=N, CH
Y = C1, COOH, CO,CH,, SO2CH,CH,, CH2CF3, CF,, OCH2C1, OCH2, OCH2CF, NO2, OCH2CHs.O(CH2)2OCH3O(CH2)2CI.COOC, Hs.CON(CH,)2R=CH3
R, =CH:, CI.OCH. 、CHOF2、NHCH3、N(CH:)2、CF:、SCHR2 - OCH,、CH3、C1、CHOF2、OC2 Hs、OCH2CF:The herbicidal activity varies with the nature and position of each substituent. The above chemical structures, through model structure transformation and modification, when the benzene ring is changed to pyridine, phenanthracene, furan, naphthalene ring, the compound also has strong activity. Amidosulfuron has no aromatic ring structure and no substituent on the sulfonylurea bridge; contains trinitrogen ring or pyrimidine ring, and the fourth and sixth positions on the ring contain substituents CH:、OCH3、CI; monosulfuron is a single substituent. The above are collectively referred to as sulfonyl urea herbicides. This type of compound has high activity against weeds and can be used to control weeds in farmland, forest land and non-cultivated land. 2.2
Long-residual herbicide After use, the herbicide remains in the soil for a long time. Even if there is a trace amount of residue, it is easy to cause damage to sensitive crops in the following crops. This type of herbicide is called a long-residual herbicide. Sulfonylurea long-residual herbicide varieties include chlorsulfuron, metsulfuron-methyl, ethametsulfuron-methyl, chlorimuron-methyl, monosulfuron-methyl, etc.
3 Technical criteria for the use of sulfonylurea herbicides
3.1 Technical criteria for use (see Table 1)
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3.2 Conditions of Use
3.2.1 Selection of Agents
The selected agents should be products that have obtained pesticide registration, and the product quality inspection should meet the requirements of relevant standards. 3.2.2 Selection of Crops and Cultivated Varieties
It should be used only within the scope of registered crops, and the varieties with strong drug resistance that have been tested and demonstrated should be selected. 3.2.3 Objects of control
The herbicide spectrum of the selected pesticide should be consistent with the types of weeds in the field. 3.2.4 Cultivation conditions
Cultivation conditions should be in line with the actual local agricultural production. The selected plots should be where no pesticides were used in the previous crop or the used pesticides have no effect on the current crop. The seeds should be covered with soil and the seedlings should be strong. 3.2.5 Dosage and application method
The dosage should be strictly in accordance with the recommended dosage, and the application amount should be calculated based on the actual application area. When preparing the solution, the secondary dilution method is adopted. First prepare the mother solution, then dilute it, and spray it evenly immediately after mixing. The water consumption should be in line with the actual local agricultural production. Generally, a fan-shaped nozzle non-ultra-low volume sprayer is used, and the spray pressure is controlled at more than 3 atmospheres. After spraying, the spray equipment is thoroughly cleaned. 3.2.6 Application period
The pesticide should be applied according to the label instructions of the product used. 4 Main factors affecting the long-residual sulfonylurea herbicides and reasonable use technology 4.1 Factors affecting the long-residual herbicide
The length of sulfonylurea herbicide residue in the soil is mainly determined by the characteristics of the compound itself and the quality of the product, as well as the dosage, soil characteristics (soil pH, soil type), application period, spray quality, temperature and humidity. We should be cautious about the promotion of long-residual herbicides and adhere to the principles of testing, demonstration and promotion. 4.1.1 Soil pH
The degradation rate of sulfonylurea herbicides in the soil varies with the pH value. They are easily degraded under acidic conditions of pH ≤ 7, and degrade slowly in alkaline soils of pH> 7.
4.1.2 Soil texture
The organic matter content of soil has little effect on the biological activity of sulfonylurea herbicides. Generally, the residual activity in soil with high organic matter content is lower than that in soil with low organic matter content.
4.1.3 Soil temperature and humidity
Soil temperature and humidity affect the degradation rate of sulfonylurea herbicides. Generally, high temperature and high humidity are conducive to the hydrolysis of the agent; on the contrary, the agent decomposes slowly and the residual period in the soil is prolonged. 4.1.4 Residual accumulation of sulfonylurea herbicides Chlorsulfuron and metsulfuron-methyl are applied at high doses for many years, resulting in the accumulation of residues in the soil, which aggravates the impact on subsequent crops. High dose application for many years should be avoided.
4.2 Reasonable use of technology
4.2.1 Reasonable arrangement of subsequent crops
Different crops have great differences in sensitivity to long-residual herbicides, and crops with strong drug resistance should be arranged for subsequent crops. 4.2.1.1 Effects of Chlorsulfuron on Subsequent Crops After the fields were treated with Chlorsulfuron, the following crops should not be planted: beets, corn, sorghum, soybeans, millet, rapeseed, lentils, cotton, sunflowers, pumpkins, tobacco, sugarcane, green onions, celery, peppers and other sensitive crops, and these crops should not be interplanted in wheat fields; at the same time, wheat stubble fields that have been treated with Chlorsulfuron cannot be used for rice seedling raising, direct seeding, seedling throwing, and seedling transplanting. In terms of drug resistance, rice is resistant to chlorsulfuron, and large seedling transplanting rice has strong drug resistance. At the recommended dose, it is safe for transplanted rice to be treated with an interval of about 200 days after the drug. 10
4.2.1.2 Effects of metsulfuron-methyl on subsequent crops NY 686—2003
After using metsulfuron-methyl in the field, the subsequent crops should not be planted: rapeseed, cotton, soybean, mung bean, corn, peanut, red bean, cabbage, sesame, melon and other sensitive crops, and these crops should not be interplanted in wheat fields. The sensitivity of metsulfuron-methyl to subsequent rice is as follows: stem rice, glutinous rice, hybrid stem rice > conventional glazed rice > hybrid glazed rice; early rice, late rice; avoid raising rice seedlings in wheat stubble fields and direct seeding fields. At the recommended dose, an interval of more than 150 days after the application is safe for transplanted rice.
4.2.1.3 Effects of ethametsulfuron-methyl on subsequent crops Rice is relatively sensitive to ethametsulfuron-methyl, and the sensitivity of different rice types to ethametsulfuron is in the following order: direct seeded rice > transplanted rice; stem rice, glutinous rice > rice; early rice > single season medium rice or single late rice. Planting cotton, peanuts, and soybeans in the following crops is relatively safe, but it is not safe for rice (seedling fields, direct-seeding fields) and corn. In areas where the recommended dose and soil pH is <7, the interval after the drug is more than 180 days, which is relatively safe for transplanted rice. 4.2.1.4 Effects of chlorimuron-methyl on subsequent crops The soil half-life of chlorimuron-methyl is (7-20) days. After using metsulfuron-methyl in the field, the following sensitive crops cannot be planted in the second year: rapeseed, beets, potatoes, carrots, onions, pumpkins, white-seeded melons, mustard, cabbage, lentils, sunflowers, tobacco, direct-seeding rice, etc., and soil cannot be taken for seedling soil. In terms of drug resistance, wheat ≥ corn, sorghum, and millet. Chlorimuron-methyl should be limited to soybean continuous cropping areas and wheat-soybean rotation areas, with a minimum interval of 90 days for planting wheat and an interval of more than 300 days for planting corn, millet, cotton, and peanuts. 4.2.1.5 Effect of monosulfuron on subsequent crops After monosulfuron is applied to the field, it is safe to sow corn and soybeans at an interval of 150 days, which is suitable for use in wheat-summer corn rotation areas. The sensitivity of different subsequent crops is in the order of rapeseed>upland rice>amaranth>sorghum>sesame>soybean>corn>millet>wheat and oats. Rapeseed is the most sensitive, and rapeseed, rice, amaranth, sorghum and other crops should not be planted as subsequent crops. 4.2.2 Application technology to reduce the amount of long-residual herbicides 4.2.2.1 Use of adjuvants
For post-emergence spray, generally 1% of vegetable oil adjuvant or non-ionic surfactant (0.1~~0. 25)% should be added to the diluent.
4.2.2.2 Reasonable mixing
Select suitable mixing agents to reduce the amount of sulfonyl herbicides. Mixed pesticides should be safe for the crop, complementary to the control targets, non-antagonistic, easily degradable in the soil and with diverse modes of action. They should be mixed and rotated, and used in reasonable combinations. 4.2.2.3 Agricultural measures and weed control should be coordinated
An environmentally friendly farmland weed control technology system combining agricultural measures, ecological regulation and chemical control should be established. Specifically, reasonable close planting, increased application of organic fertilizers, and reduced row spacing; use mulch or rice straw and wheat straw to cover to reduce the occurrence of weeds; maintain soil moisture, improve drug efficacy, and reduce the amount of drugs used. Under drought conditions, use mechanical soil mixing or ridge planting after sowing to apply pesticides mechanical soiling in time to suppress and protect picking to reduce pesticide loss, increase irrigation water, and accelerate pesticide degradation.
4.2.3 Use safeners to reduce pesticide damage to sensitive crops. Generally, seed dressing with protective agents is used, such as using 0.5% NA (1,8-naphthalene anhydride) to treat seeds of corn, wheat, barley, rice, and sorghum, which increases their resistance to chlorsulfuron and metsulfuron; spraying plant growth regulators (such as gibberellins, brassinolide, Kangkai, sodium nitrophenolate, etc.) promotes crop growth and improves safety.
4.2.4 Prevention of resistance
Rational rotation of herbicides with different action targets should be selected; at the same time, the planting method of water-dry crop rotation should be taken into account.2 Reasonable mixing
Select suitable mixing agents to reduce the dosage of sulfonyl herbicides. Mixed agents should be safe for the crop, complementary to the control targets, non-antagonistic, easily degradable in the soil, and have a variety of modes of action. They should be mixed and rotated, and used reasonably. 4.2.2.3 Coordination of agricultural measures and weed control
An environmentally friendly control technology system for farmland weeds should be established that combines agricultural measures, ecological regulation and chemical control. Specifically, reasonable dense planting, increased application of organic fertilizers, and reduced row spacing; use mulch film or rice straw and wheat straw to cover to reduce the occurrence of weeds; maintain soil moisture, improve drug efficacy, and reduce the dosage. Under drought conditions, use mechanical soil mixing or ridge planting after sowing to apply the drug, mechanical soiling, timely suppression, and picking to reduce the loss of the drug, increase irrigation water, and accelerate the degradation of the drug.
4.2.3 Use safeners to reduce pesticide damage to sensitive crops. Generally, seed dressing with protective agents is used, such as using 0.5% NA (1,8-naphthalene anhydride) to treat seeds of corn, wheat, barley, rice, and sorghum, which increases their resistance to chlorsulfuron and metsulfuron; spraying plant growth regulators (such as gibberellins, brassinolide, Kangkai, sodium nitrophenolate, etc.) promotes crop growth and improves safety.
4.2.4 Prevention of resistance
Rational rotation of herbicides with different action targets should be selected; at the same time, the planting method of water-dry crop rotation should be taken into account.2 Reasonable mixing
Select suitable mixing agents to reduce the dosage of sulfonyl herbicides. Mixed agents should be safe for the crop, complementary to the control targets, non-antagonistic, easily degradable in the soil, and have a variety of modes of action. They should be mixed and rotated, and used reasonably. 4.2.2.3 Coordination of agricultural measures and weed control
An environmentally friendly control technology system for farmland weeds should be established that combines agricultural measures, ecological regulation and chemical control. Specifically, reasonable dense planting, increased application of organic fertilizers, and reduced row spacing; use mulch film or rice straw and wheat straw to cover to reduce the occurrence of weeds; maintain soil moisture, improve drug efficacy, and reduce the dosage. Under drought conditions, use mechanical soil mixing or ridge planting after sowing to apply the drug, mechanical soiling, timely suppression, and picking to reduce the loss of the drug, increase irrigation water, and accelerate the degradation of the drug.
4.2.3 Use safeners to reduce pesticide damage to sensitive crops. Generally, seed dressing with protective agents is used, such as using 0.5% NA (1,8-naphthalene anhydride) to treat seeds of corn, wheat, barley, rice, and sorghum, which increases their resistance to chlorsulfuron and metsulfuron; spraying plant growth regulators (such as gibberellins, brassinolide, Kangkai, sodium nitrophenolate, etc.) promotes crop growth and improves safety.
4.2.4 Prevention of resistance
Rational rotation of herbicides with different action targets should be selected; at the same time, the planting method of water-dry crop rotation should be taken into account.
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