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First, the quality of land preparation The quality of land preparation is directly related to the efficacy of acetochlor. 1. The quality of the land preparation is not good. The old grass is not cleaned up, which directly affects the weeding effect. Because acetochlor can only be absorbed by weed shoots and young roots, it has no control effect on the formed weeds. 2. The quality of the land preparation is not good, the soil is uneven, and the liquid can not be sprayed evenly, which will affect the herbicidal effect.
Second, the time of administration Acetochlor is a selective pre-emergence herbicide. Only when the weeds are used before the crops are planted, can the effects be exerted, and the earlier the better, the weeds that have been unearthed. Basically no defense.
Third, soil moisture The effect of acetochlor on weeds is mainly through the absorption of weed shoots and radicles, inhibiting the growth of young shoots and radicles, stimulating roots to produce tumor-like deformities, resulting in weed death. Certain soil moisture is conducive to improving the herbicidal effect. If there is continuous dry weather during the medication phase, the herbicidal effect will be greatly reduced. Therefore, first watering to increase soil moisture and then use it is one of the key measures to improve the efficacy of acetochlor.
Fourth, the phytotoxicity problem 1, acetochlor herbicide is prohibited on cucumber, rice, spinach, wheat, leeks, sorghum and other sensitive crops. 2, acetochlor herbicide in tomato, corn, soybeans, vegetables, rapeseed and other crops should be limited to 50 ~ 75 ml per acre, otherwise it is easy to produce phytotoxicity.
Author: Ping Guomin Source: Agricultural Science and Technology
In recent years, due to changes in planting structure, the dryland crops in China have expanded rapidly, and the use of dryland herbicide acetochlor in corn, peanuts, tomatoes, green beans and other crops has also increased rapidly. Some farmers have caused poor herbicidal effects due to improper use during use, and even caused phytotoxicity. To this end, the following four points should be noted when using acetochlor herbicides for weeding in drylands:
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