What herbicides are there? Introduction to common agricultural types
Farmers all know that in the process of producing crops, herbicides are inevitably used, and there are many varieties of herbicides, which have good control effects on different weeds, and herbicides can help reduce nutrient consumption and increase crop yields. So what are the common herbicides in agriculture? Let's take a look together!
1. Pendimethalin
This is a selective herbicide for dryland crops. It is now widely used for weed control in corn, soybean, peanut, cotton, vegetables and other crops. It has wide applicability and can be sprayed directly. It can prevent weed seedlings from growing and can control grass weeds such as barnyardgrass, crabgrass, foxtail, sprangle-top, goosegrass and purslane. If used on perennial weeds, the effect is poor. It is generally sprayed on the soil surface after sowing and before emergence.
2. Pyrazosulfuron-ethyl
A systemic conductive herbicide. After being absorbed by weeds, it causes chronic death of weeds, and it has no herbicidal effect on rice. Its efficacy is stable, its safety is high, and its residual effect period is 25~35 days. It is suitable for rice seedling fields, direct-seeded fields and transplanted fields. It has good control effects on annual broadleaf weeds such as Cyperus serotinus, Scirpus juncoides, Monochoria vaginalis, water dropwort, Rotala indica, wild arrowhead, Potamogeton distinctus and duckweed. In most cases, it is mixed with soil and broadcast.
3. Pretilachlor
A herbicide specially used in paddy fields. It is safe for rice and has a broad weed-killing spectrum. Weed seeds absorb the agent during germination, while root absorption is relatively poor. It can only be used as pre-emergence soil treatment. When using it, attention should be paid to using a safener. It has significant control effects on annual grass weeds such as barnyardgrass, junglerice, sprangle-top, goosegrass, Eleocharis, narrowleaf water plantain and water amaranth. It is generally used after rice sowing.
4. Molinate
A systemic paddy field herbicide that can be absorbed by the roots and buds of weeds. It also has a relatively wide application period. However, its weed-killing spectrum is narrow. It is suitable for controlling barnyardgrass, Eleocharis and Cyperus difformis in paddy fields. When rice seedlings grow to the 3-leaf stage, use 100-150 ml of 96% emulsifiable concentrate per mu mixed with soil and broadcast. If barnyardgrass is at the 4-5 leaf stage, the dosage needs to be increased.
In summary, the introduction to common agricultural herbicides ends here. If everyone wants to use herbicides to control weeds, it is necessary to correctly select herbicides according to the weeds in order to achieve good control effects.
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