October 24, 2021

Explain the duration of common herbicides in the soil

In this year's answer to a technical call, a customer asked me how long it took to grow corn after the high-efficiency flupirtine was applied. The herbicides were all known to be high-efficiency flupirtine is a broad-leaf crop field for controlling grasses. Weeds, corn is a grass crop, according to the theory can not be planted, but in practice, as long as it does not cause phytotoxicity to farmers can still solve the current problem can still be used.

Explain the duration of common herbicides in the soil

Back to the topic, the issue of pesticides on soil persistence, meaning and significance of the pesticide half-life of digestion are similar, but understand different perspectives, digestion pesticide half-life: namely pesticides in half the time required for digestion, if a half-life of the pesticide digestion 1 day, then the original residue is 10ppm, then 5ppm after 2 days, 2.5ppm after 4 days, and so on, in theory, pesticides will not be 100% degraded in plants or soil. The soil retention period of pesticides is more than 2 times the half-life of pesticide digestion, and the crops that are sensitive to some pesticides cannot grow the crops as long as they contain the pesticides in the soil. Therefore, for some commonly used pesticide theories The soil duration (or soil digestion half-life) is briefly introduced, but provides a data reference and provides a theoretical basis for practical applications.

1. High-efficiency flupirtine: its half-life in soil is about 20 hours, which is easy to decompose pesticides in soil, so theoretically it is affected in planting corn after wilt weed poisoning (≥7 days) Not very big, but it is recommended to plant broadleaf crops as safest.

2. Quinoxaline: digestion and digestion half-life in soil within one day, mainly microbial digestion, faster digestion, half-life of 19 hours in pH9 buffer solution, in sesame soil and sesame plants, The half-life of digestion was 1.35 days and 1.18 days, respectively.

3. Pyridoxine: rapid hydrolysis in moist soil, digestion half-life of less than 7 days, theoretically in aqueous solution photolysis digestion half-life of 6 days.

4. Cyhalofoprin: The half-life of digestion in soil is less than 4 hours and does not cause toxicity to fish.

5. Acetyl oxalic acid: The hydrolysis half-life is 2.2 hours at a pH of 9 and 64 hours at a pH of 7, and is stable in an acidic medium.

6. Cholesterol and grass: The half-life of digestion in soil is 1-10 days.

7. Carbendazim: The soil is rapidly decomposed by microbial action, and the half-life of digestion is about 11 hours. However, according to different types of soil digestion speeds, under the same conditions, the dissolution rate is yellow soil>black soil>red soil, so In the yellow soil region of North China, acesulfame is suitable for planting other crops after 2 days of use;

8. Fomesafel: The half-life of digestion is 3 weeks in the irrigated soil and 6-12 months in the aerobic soil of the laboratory, so in the plots where the agent has been used, except for soybeans, red beans and mung beans, It takes at least 12 months for the crop to be planted to be relatively safe for crops.

9. Oxyfluorfen: The digestion in the soil is slow, the half-life is digested for 30 days, and finally it is decomposed into carbon dioxide by microorganisms in the soil.

10. Acifluorfen: The half-life of soil digestion is 30-60 days, and 110 days under light conditions.

11. Fluroxypyrazine: It is present in most types of soil for a short period of time. The half-life of digestion in the wild ranges from 1 to 7 days. It is rapidly digested, mainly by the action of microorganisms and hydrolysis.

12. Acetochlor: Mainly used for soil closure before emergence, the duration of its application in the soil is 8-10 weeks.

13. Metoclopramide: The half-life of digestion in soil is about 26 days, the duration of effect is 8-12 weeks, and the soil half-life is also different according to the soil texture and climate of each place. The half-life is 10-12 days and Jilin is 16-17 days.

14. Propisochlor: The duration of the soil is 60-80 days

15. Acetochlor: 30-50 days in water

16. Butachlor: The half-life of digestion in soil is about 30 days, and the duration of effect is about 6 weeks.

17. Diflufenacil: Under normal temperature and oxygen supply conditions, the half-life of digestion is 15-50 weeks. The length of time depends on soil type and organic matter content, and the digestion rate accelerates decomposition with increasing temperature and humidity.

18. Methionamide: The shelf life is more than 30 days, and it can not be used in rice seedling stage.

19. Enemy: The average half-life of digestion in rice plants and soil is 1.2 days and 1.3 days.

20. 2 methyl 4-chloroisooctyl ester: The half-life of digestion and digestion in soil is less than 7 days, but the half-life of digestion in water is less than 1 month, and the residual period in moist soil is about 30 days.

21. 2,4-D isooctyl ester: The residual period of 2,4-D in the soil is about 20 days.

22. Wheatgrass: In the case of 500 grams of active ingredient per hectare, the residual period is 60-75 days, and the area with dry and dry conditions will be prolonged.

23. Isoxantine: The half-life of digestion in soil is 10-137 days. The digestion depends on the microorganisms in the soil. The chemical duration is at least 6 months. The effective ingredient is 700 grams per hectare. The period is also different, corn is 9-12 months, wheat, peanuts, millet, sunflower, vegetables are 12-16 months, beets and sorghum are 9 months, and flax is 9-16 months.

24. Chlorpyrifos: The half-life of digestion in soil is 1.8-8.6 days.

25. Glyphosate: When 95% of the glyphosate isopropylamine salt soluble powder is 0.32 g per square meter of soil, the half-life of digestion in the soil is 10.86-16.08 days, and the degree of microbial influence in the soil is in turn Nematodes, bacteria, fungi.

26. Glufosinate: The half-life is 8.9 days in loam and 25.6 days in sand.

27. Shakespeare: The half-life of digestion in loam is 1.51-2.65 days.

28. Trifluralin: The half-life of trifluralin in aquaculture water is about 35 days, the half-life in soil is 57-126 days, it is not easy to be leached by rain, the active ingredient per hectare is 720-1080 g, 12 Corn and wheat can be grown in the month and beets can be grown in 24 months. And the higher the fat content of the seeds, the safer the application of trifluralin.

29. Zhong Dingling: The half-lives in the soil are 9.04 and 11.17 days, respectively, in the case of a dose of 1800 g/ha and twice the amount of recommended agent.

30. Pendimethalin: The half-life in soil is 14.7-19.5d, and the residual period is generally 6-9 weeks.

31. Mesotrione: The half-life of soil residual digestion is 3.51 - 3.83 days, but when the active ingredient per hectare is 150 grams, wheat can be grown after 4 months, soybeans and flax, potato can be grown after 10 months. Sunflower, December rapeseed, and beans and beets are grown in August.

32. Dicyclic sulcotrione: The soil in water has a shelf life of 6-8 weeks.

33. Zantoxarone: The half-life in soil is only a few hours.

34. Oxazone: The half-life in soil is up to 125 days.

35. Alkene: The half-life in soil is 12-26 days.

36. Herneone: The half-life in soil is 3-26 days

37. Isoxaflutole: It can be used for 8-10 weeks before planting. When the active ingredient per hectare is 71-170 grams, it is necessary to plant soybean, sorghum, sunflower, potato at least 6 months apart. Tomatoes; 4 months of growing wheat, 18 months of rice, peanuts, millet, cotton and vegetables.

38. Azinone: The half-life in soil is about 28 days, and the duration of effect is up to 90 days. When the active ingredient per hectare is 350-700 grams, it is necessary to plant wheat and kidney beans at least 4 months apart, and plant for 8 months. Rice, planting flax, sorghum, sunflower for 12 months, and growing beets, canola, tobacco and vegetables for 18 months.

39. Oxazone: The half-life in soil is 2-6 months.

40. Propyne oxaloquinone: The duration of the soil is approximately 30 days.

41. Cyclopentazone: The duration of the soil is approximately 50 days.

42. Oxazinone: The half-life of digestion in water at 50 ° C is about 30-60 days.

43. Herbicide: The theoretical half-life of the soil is 9.6-12.5 days.

44. Octanoyl bromide: The theoretical half-life of the soil is 15 days.

45. Chlorflupiracetic acid: The theoretical half-life of the soil is 7.76-8.37 days.

46. ​​Atrazine: The residual period can generally last for about half a year. When the active ingredient per hectare is greater than 2000 grams, in addition to corn, sorghum and sugar cane, it takes at least 24 months to grow other crops.

47. Purification: It can be adsorbed by soil cosmids for a period of 20-70 days.

48. Xicaojing: It is neutral in the soil and has a long-lasting effect of 35-45 days.

49. Cyanazine: The half-life in moist soil is 14-16 days, and the efficacy period is 2-3 months.

50. Tetinjing: The duration of the soil is 3-10 weeks.

51. Destroy the net: This agent can be adsorbed by the soil for a period of 20-70 days.

52. Simazine: It has a long residual effect in the soil and can last for up to one year. When the active ingredient per hectare is 2240-4480 grams, it needs to be separated by at least 24 months except for corn, sorghum and sugar cane. Other crops.

53. Isoproturon: The half-life in soil is about 20 days, and the duration of application in autumn is 2-3 months.

54. Diuron: low water solubility, low leaching in soil, 680-5000 grams per hectare, its long-lasting period can be 8-16 months, low-dose 2-3 months.

55. Diquat is fast: the half-life of digestion in the soil is 2.42 days.

56. quinclorac: the half-life of digestion in soil is 16.6-21.9 days, and the field water is 15.4-16.9 days. When the active ingredient per hectare is 106-177 grams, soybeans, watermelons and peppers need to be planted at least 4 months apart. Plant corn for 10 months and other vegetables and other crops for 24 months.

57. Imidazoic acid: The half-life of digestion in soil is 1-3 months, but when the active ingredient per hectare is 75 grams, it takes at least 12 months to grow corn, wheat, tobacco; 24 months to grow rice, sorghum , millet, 40 months to grow vegetables.

58. Imazamox: The half-life of digestion in soil is 10.3-11.8 days. When the active ingredient per hectare is 45 grams, it is necessary to plant wheat at least 4 months, millet for 12 months, rapeseed for 18 months, and flax. Planting corn, sorghum, peanuts, vegetables and other crops for more than 9 months.

59. Nicosulfuron: The theoretical half-life of soil in the soil is 9.63-13.59 days. When the active ingredient per hectare is 60 grams, it is necessary to plant wheat at least 8 months apart, and soybeans, cotton and peas can be planted in 10 months. December Planting rice, peanuts, and alfalfa; planting other crops such as vegetables for 18 months.

60. Bensulfuron: The theoretical half-life of soil in the soil is 8.61-10.34 days, and the residual period is about 60 days.

61. Thiosulfuron-methyl: the half-life in soil is 6-12 days under natural light, 14 days in the absence of light, the temperature is 30 °C, and the half-life in soil with a pH of 8 is 12 hours, but it is generally considered to be in soil. The residual period is about 30 days.

62. Pyrazosulfuron: The half-life of digestion in field water and soil is 5.29-6.42 days and 4.99-6.42 days, respectively, and the duration of effect is generally 25-35 days.

63. Bensulfuron-methyl: The half-life of digestion in soil is 4-21 weeks and 15-40 days in water.

64. Sulfonamide: The soil half-life in Changchun City, Jilin Province is 14.1-14.2 days.

65. Methyl disulfuron: The theoretical half-life of the soil in the soil is 9.47-10.7 days.

66. Trifluridinesulfuron sodium salt: It is rapidly digested in soil with a half-life of 7.19 to 8.51 days.

67. Pyrazinsulfuron: The half-life in aerobic soil is 39.3 days. The half-life in water was 196.2 days (pH 7, 25 ° C).

68. Formamide sulfonate: It is easily degraded in most cultivated soil under normal conditions with a half-life of 1.5-9.4 days.

69. Chlorpyrazin: The theoretical half-life of soil in the soil is 7-16.9 days.

70. Isosulfuron: Under aerobic conditions, the theoretical half-life of the soil is 2-10 days.

71. Diflufenacil: The rate of degradation in soil is determined by soil temperature and humidity, with a half-life of 1.0-8.5 days at 20-25 °C.

72. Penoxsulam: In the paddy field, the half-life is 2-13 days.

73. Chlorosporin: The average half-life in soil is 18d; the photolysis in water is fast, the half-life is <1h, and the active ingredient per hectare is 37.8g. It needs to be separated by 3 months of wheat, 9 months of corn, rice, Cotton, sorghum, peanuts, and alfalfa; sunflower and tobacco are grown for 30 months.

74. Azoxysulfuron: The half-life of digestion in soil is 1-3 months. When the active ingredient per hectare is 48-60 grams, peanuts, sweet potatoes and kidney beans should be planted at least 4 months apart. Rice is grown for 6 months. Planting sorghum, potatoes, and peas for 12 months; planting vegetables for 26 months.

75. Flufensulfame: At 30 ° C, its hydrolysis half-life is 1.1-17.3 days, and the soil digestion half-life is 18-52.5 days.

76. Pyrimidin: The half-life of digestion in water is 3.41-3.89 days, and the half-life of digestion in soil is 2.77-4.07 days.

77. Bismuth: The half-life of digestion in paddy water and soil is 1.77 and 2.33 days.

78. Chlorfluridol: The half-life of digestion in soil is 10-30 days.

79. Oxazolamide: The half-life in soil under normal conditions is 40-60 days, and the half-lives in the paddy fields in Nanjing and Nanchang are 1.3 and 2.3 days, respectively.

All of the above-mentioned agents are only some of the common drugs on the market. The digestion in the soil follows the first-order reaction kinetics, including the ingredients, concentration, soil type, organic matter content, temperature, humidity, microbial activity, crops grown in the season, etc. The effects of complex relationships are mainly caused by soil degradation, hydrolysis, photolysis, soil adsorption, leaching, chemical volatilization, and microbial degradation.

The above pesticides are based on the half-life of the original drug component in the soil. According to the chemical pesticide environmental safety evaluation test criteria, the degradation half-life of the pesticide in the soil, the degradation of the pesticide in the soil is divided into four grades, namely T1 /2<1 month, pesticides are easily degraded; in January, pesticides are difficult to degrade. Therefore, except for the individual herbicide varieties, most of the other herbicides are in the range of easy degradation. And the concentration of the drug is based on the experimental and recommended registration dose as the basic reference value, and its duration in the soil is only a general theoretical range, but there is no certain period, but only provides a theoretical reference for the cultivation of the inverted crop. .

Nowadays, due to the use of chemical pesticides all the year round, the soil pollution caused by pesticide residues and the reduction of cockroaches have caused serious damage to the soil. The country now advocates zero growth of pesticides. Therefore, from the perspective of the pharmacological properties of the medicament itself, some pesticides that are easy to dissolve are also used for agriculture. The environment plays a positive role.

(Source: Pesticide Market Information)

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