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

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-...

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 action and low drug efficacy. The stability is low, and it is easily affected by the weather, resulting in poor weed control effect before rice seedlings, large dosage, and excessive use of herbicides, which easily affects the emergence and growth of rice seedlings

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