Most of the "oxachlor" herbicides on the market are amide herbicides, mostly soil treatment agents, which are mainly applied before the crops are post-emergence. The control effect of annual grass weeds is good, and the control effect on broadleaf weeds is poor. Under normal circumstances, the control effect: acetochlor > metolachlor = propisochloramine > butachlor > alachlor.
Let me introduce the product characteristics and usage methods of each "oxachlor" herbicide:
Acetochlor
The period of validity is 40 to 70 days. It is mainly kept in the soil layer of 0~3cm. It can cause phytotoxicity under high temperature, high humidity or low temperature and high humidity after medicine, but it can return to normal after 10~15 days. Applying medicine 24 to 72 hours after sowing is easy to cause phytotoxicity. The main part of the weed absorption is the bud, so it must be applied before the weeds are unearthed.
Metolachlor
The effective period is 30 to 35 days, and the activity naturally disappears 10 to 12 weeks after application. Monocotyledonous weeds are mainly absorbed by the bud sheath, and the dicotyledonous weeds are absorbed by the shoots and radicles, and are transmitted upwards to inhibit the growth of the shoots and fine roots. The sensitive weeds die after being germinated or just unearthed or poisoned. . Gramineous weeds have stronger absorption capacity than broadleaf. It is advisable to apply the medicine 3 to 5 days before transplanting. The seed is used for pre-emergence 1 to 2 days after the broadcast. The drug is easily degraded by soil microbes and has a moderate effect period.
Propisochlor
The shelf life is 60-80 days, which is safe for the crops. It is not effective for perennial grass weeds and broadleaf weeds. The drug is suitable for mulching field, irrigated fields and summer crops and southern dryland applications. Rice buds are very sensitive to them.
Butachlor
The period of validity is about 60 days. It is effective for weeds and weeds before the 2-leaf stage. Putian is used for 3 days after sowing, and the herbicidal effect is good; before or after herbicidal effect is general, it is easy to produce phytotoxicity in advance. Water can't drown in the heart.
Alachlor
The time to control weeds is generally about 60 days. Can be adsorbed by the soil, not easy to leaching, and not easy to volatilize. Rice, sorghum, millet, cucumber, leeks, and spinach crops are very sensitive to it. The depth of the mixed soil is preferably not more than 5 cm.
Other "oxachlor" pesticides with different pharmacodynamic effects depending on the environment and method of use:
Acetochlor
It lasts for 30 to 50 days in paddy fields. When used alone, it can only be used for transplanting paddy fields. It is harmful to seedlings when used in polders and live fields. However, the addition of safeners can make up for the deficiency. When the dosage is too large, the leaves of the seedlings, the tip of the leaves and the leaves are green and curled, and the growth of the plants is inhibited.
Ketochlor
The period of validity is about 40 days. Cucumber is very sensitive to it, and its safety is worse than that of butachlor. It is not suitable for rice field, live field and seedling, weak seedling and water leakage.
Naproxil
The half-life is as long as 12 weeks. It is effective in the pre-emergence or post-emergence 1 leaf stage. Gramineous wheat, Liliaceae, celery, fennel, fennel, and lettuce are sensitive to it.
Enemy
Used in rice fields, it breaks down quickly in the soil. It is a highly selective contact herbicide that does not conduct and acts only at the contact site and is only used as a stem and leaf treatment agent. Rice can not be used within 10 days before and after spraying, can not be mixed with 2,4-D, and can not be used with liquid fertilizer.
Herbicide
The period of validity is about 60 days. After application, keep the shallow water layer for 5-7 days, no drainage, and no string irrigation. Suitable for mulching field, irrigated fields, summer crops and dryland applications in the south, rice buds are very sensitive to them.
Dibenzoylamine
Long-lasting effect. It takes about one year after application to grow wheat, etc. It has special effects on 1-year-old broadleaf weeds and grass weeds. However, it is less effective for perennial weeds. It must be applied before the germination of weeds, and the residual period is as long as 1 to 2 months. If it is applied during the growth period of weeds, it is invalid.
Methionamide
It has a shelf life of more than one month and is used in paddy fields. For the special effect of valerian, the rice is transplanted after 3 to 10 days, and the water-retaining layer is 3 to 4 cm. It should not be applied in the rice seedling stage, especially in the seedling stage.
Pirfenamide
It is a carotenoid biosynthesis inhibitor and is a broad-spectrum selective wheat field herbicide. The use of it should be noted that the application of diflufenic is longer, and it can be applied from the sowing date to the early winter; the efficacy period in the soil is longer, and the pig scorpion, the mother-in-law, the leeks, etc., which are later germinated, can be considered. However, in the case of pre-emergence application, heavy rain, especially during the bud period, can cause the crop leaves to temporarily discolor. At the same time, the drug should be used alone before germination. It is necessary to finely level the land, and then cover it closely after planting, and then apply the medicine. After the medicine, the topsoil layer cannot be turned.
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