Long-acting rice pre-emergence special herbicide and preparation method thereof

A herbicide and rice seedling technology, applied in the direction of herbicides and algicides, botanical equipment and methods, plant growth regulators, etc., can solve the problem of affecting the emergence and growth of rice seedlings, poor weed control effect, and drug efficacy Low stability and other problems, to achieve a good effect of sealing grass, maintain the number of emergence and growth quality, maintain the effect of emergence rate and growth quality

Active Publication Date: 2021-02-26
HAINAN SHENNONG DAFENG SEED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of weeds in the direct seeding paddy field and the long emergence period, in the process of sealing the soil before the seeding and killing the weeds, the existing rice pre-emergence compound herbicides often have a short duration of

Method used

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  • Long-acting rice pre-emergence special herbicide and preparation method thereof
  • Long-acting rice pre-emergence special herbicide and preparation method thereof
  • Long-acting rice pre-emergence special herbicide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Embodiment 1-a kind of preparation method of long-acting rice pre-emergence special herbicide, comprises the steps:

[0032] (1) mixing urea and a 37% formaldehyde solution with a mass concentration of 1:2 in a molar ratio, and heating and mixing in a 70° C. water bath for 2h, with a pH value of 8.0, to obtain a urea-formaldehyde prepolymerization solution;

[0033] (2) using bensulfuron-methyl, bispyribac, clomazone and acetone, carry out ultrasonic stirring and mixing according to the weight ratio of 0.2:0.8:2:14 to obtain the initial mixed solution of herbicide A; Acetochlor and acetone are 1:1:16 to carry out ultrasonic stirring and mixing according to the weight ratio to obtain the initial mixed solution of herbicide B;

[0034] Wherein, the frequency of ultrasonic mixing is 30kHz, the power of ultrasonic treatment is 300W, the time of ultrasonic treatment is 5min, and the stirring speed is 200r / min;

[0035] (3) Mix the initial mixed solution of herbicide A, chit...

Example Embodiment

[0041] Embodiment 2-a kind of preparation method of long-acting rice pre-emergence special herbicide, comprises the steps:

[0042] (1) mixing urea with a 37% formaldehyde solution in a molar ratio of 1:2, and heating and mixing in a water bath at 80°C for 2.5h, with a pH value of 8.0, to obtain a urea-formaldehyde prepolymerization solution;

[0043](2) using bensulfuron-methyl, bispyribac, clomazone and acetone, carry out ultrasonic stirring and mixing according to the weight ratio of 0.5:1.2:3:18 to obtain the initial mixed solution of herbicide A; Acetochlor and acetone are carried out ultrasonic stirring and mixing according to the weight ratio of 3:3:28 to obtain the initial mixed solution of herbicide B;

[0044] Among them, the frequency of ultrasonic mixing is 35kHz, the power of ultrasonic treatment is 400W, the time of ultrasonic treatment is 10min, and the stirring speed is 400r / min;

[0045] (3) Mix the initial mixed solution of herbicide A, chitosan, dispersant,...

Example Embodiment

[0051] Embodiment 3-a kind of preparation method of long-acting rice pre-emergence special herbicide, comprises the steps:

[0052] (1) mixing urea and a 37% formaldehyde solution with a mass concentration of 1:2 in a molar ratio, and heating and mixing in a 75°C water bath for 2.0h, with a pH value of 8.0, to obtain a urea-formaldehyde prepolymerization solution;

[0053] (2) using bensulfuron-methyl, bispyribac, clomazone and acetone, carry out ultrasonic stirring and mixing according to the weight ratio of 0.3:1.0:2.5:16 to obtain the initial mixed solution of herbicide A; Acetochlor and acetone are ultrasonically stirred and mixed according to the weight ratio of 2:2:20 to obtain the initial mixed solution of herbicide B;

[0054] Among them, the frequency of ultrasonic mixing is 35kHz, the power of ultrasonic treatment is 350W, the time of ultrasonic treatment is 8min, and the stirring speed is 300r / min;

[0055] (3) Mix the initial mixed solution of herbicide A, chitosa...

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Abstract

The invention provides a long-acting rice pre-emergence special herbicide and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a urea formaldehyde prepolymer solution; (2) ultrasonically stirring and mixing bensulfuron methyl, bispyribac-sodium, isoxaflutole and acetone to obtain a herbicide A primary mixed solution; performing ultrasonic stirring and mixing on cyhalofop-butyl, metolachlor and acetone, and obtaining a herbicide B primary mixed solution; (3) performing secondary ultrasonic stirring and mixing on the herbicide A primary mixed solution, chitosan, a compound emulsifier and water to obtain a herbicide A emulsion; performing secondary ultrasonic stirring and mixing on the herbicide B primary mixed solution, mushroom proteoglycan,Arabic gum, a compound emulsifier and water to obtain a herbicide B emulsion; (4) respectively mixing with the urea formaldehyde prepolymer solution; (5) spray drying; (6) mixing the micro-capsule particles A and the micro-capsule particles B according to a mass ratio of 3: (0.5-1); the herbicide has a good prevention effect on broadleaf weeds and gramineous weeds, has a good continuous weed sealing effect, and can maintain good and stable seedling emergence number and growth quality.

Description

technical field [0001] The invention relates to the technical field of rice weeding, in particular to a long-acting pre-emergence special herbicide for rice and a preparation method thereof. Background technique [0002] With the continuous development of agricultural mechanization, the technology of direct seeding of rice has been newly developed, which can effectively solve the intensive production of rice in the case of insufficient labor. In the early stage of rice direct seeding, the occurrence of weeds is much higher than that in cultivated or throwing rice fields. Controlling weeds has an important impact on the high and stable yield of rice direct seeding. [0003] The weed control of direct seeding herbicides in rice mainly lies in the two periods of soil sealing treatment before seeding after sowing and spraying on stems and leaves after seeding. However, due to the large base of weeds and the long emergence period of direct seeding paddy fields, the existing pre-...

Claims

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Application Information

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IPC IPC(8): A01N47/36A01N43/54A01N43/80A01N39/04A01N37/22A01N25/28A01N25/22A01P13/00A01P21/00
CPCA01N47/36A01N43/54A01N43/80A01N39/04A01N37/22A01N43/16A01N25/28A01N25/22
Inventor 陈君陈伯韬翟志勇冯辉陈昌才温建平王小苹狄正海
Owner HAINAN SHENNONG DAFENG SEED TECH
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