How to choose herbicide varieties when mixing herbicides
Selection of varieties when mixing herbicides
(Agricultural Wealth Network) Herbicide mixing is one of the important measures in integrated weed management. Through the mixing of herbicides, the weed control spectrum can be broadened, the weed control effect can be improved, the appropriate application period can be extended, phytotoxicity can be reduced, residual activity can be decreased, and the occurrence and development of herbicide resistance can be delayed. It is an important measure for improving the level of herbicide application. Whether two herbicides can be mixed should best be determined by a compatibility test. In the test, water is used as the carrier, and the herbicides to be mixed are added in sequence: water-based formulations, wettable powders, suspension concentrates, and emulsifiable concentrates. After each agent is added, it should be stirred thoroughly and left to stand for 30 minutes. If the emulsifying, dispersing, and suspending performance is good, they can be mixed. The selection of varieties for mixing herbicides should consider the following factors:
① When two or more herbicides are mixed, the herbicides should have a synergistic or additive effect on each other, and must also be physically and chemically compatible. After mixing, no precipitation, layering, or coagulation should occur.
② When two or more herbicides are mixed, the herbicides should not produce antagonism toward each other, and the phytotoxicity to crops after mixing should not easily increase.
③ The herbicide varieties mixed should preferably be different types of herbicides, or have different mechanisms of action, so as to maximize the weed control effect and maximize the delay of the occurrence and development of resistance.
④ The herbicide varieties mixed should differ in weed control spectrum or in their sensitivity to the growth stages of weeds.
⑤ For the herbicide varieties mixed, consideration should be given as far as possible to combining fast-acting and slow-acting properties, long residual period and short residual period, easy diffusion and difficult diffusion in soil, and herbicide varieties with different sites of action.
⑥ The selection of herbicide varieties for mixing and the determination of dosage should be comprehensively determined according to factors such as the weed species in the field, degree of occurrence, soil texture, soil organic matter content, crop type, and crop growth status.
The weed control effect after herbicide mixing is affected by various factors. Before large-scale application, tests and demonstrations should first be carried out at different ratios and different dosages, or it should be done under specific technical guidance.
① When two or more herbicides are mixed, the herbicides should have a synergistic or additive effect on each other, and must also be physically and chemically compatible. After mixing, no precipitation, layering, or coagulation should occur.
② When two or more herbicides are mixed, the herbicides should not produce antagonism toward each other, and the phytotoxicity to crops after mixing should not easily increase.
③ The herbicide varieties mixed should preferably be different types of herbicides, or have different mechanisms of action, so as to maximize the weed control effect and maximize the delay of the occurrence and development of resistance.
④ The herbicide varieties mixed should differ in weed control spectrum or in their sensitivity to the growth stages of weeds.
⑤ For the herbicide varieties mixed, consideration should be given as far as possible to combining fast-acting and slow-acting properties, long residual period and short residual period, easy diffusion and difficult diffusion in soil, and herbicide varieties with different sites of action.
⑥ The selection of herbicide varieties for mixing and the determination of dosage should be comprehensively determined according to factors such as the weed species in the field, degree of occurrence, soil texture, soil organic matter content, crop type, and crop growth status.
The weed control effect after herbicide mixing is affected by various factors. Before large-scale application, tests and demonstrations should first be carried out at different ratios and different dosages, or it should be done under specific technical guidance.