Scientific medicine timely weeding method

Due to cross-regional harvesting and long-distance transfer of seeds, as well as single use of fensulfuron and weeding, most of the weed populations in wheat fields have changed, and the number of malignant weeds has increased, and the range of occurrence is increasing. How to use medicine scientifically to achieve the effect of saving labor and time and timely weeding? Based on practical experience, the author proposes a method of “three reforms, two strictnesses, and one choice” for the reference of farmers.

First, the change of single drug for mixed use of a single herbicide for a long time, easy to make weeds resistant, and the accumulation of residual amounts in the soil, will inhibit the growth of the next crop. The use of mixed medicines can complement each other, expand the range of weeding, and reduce phytotoxicity. Commonly used mixed agents are: 10% phenylsulfuron-methyl WP 10g per acre and 56% sodium dimethyltetrachloride-soluble powder 100g per acre; or 15% wheat straw WP -20g per acre with helper 5 ml. It can effectively prevent weeds such as wormwood, leeks, crickets, and piglets.

Second, change the low-water coarse spray for large-volume fine spray. Generally, the water consumption per mu will be increased from the original 12.5~15 kg to 25-35 kg, and it will be sprayed into small spray evenly and finely.

Third, change the dilution to two dilutions. The herbicides such as benzosulfuron or wheat straw are first added with 1~1.5 kg of water and shaken to form a mother liquor. Then add appropriate amount of water and dilute to the required concentration.

Fourth, strict control of the concentration of the drug used, the herbicidal effect is poor; the drug consumption is large, easy to cause wheat to produce phytotoxicity. Therefore, the herbicide should be used strictly in the use concentration. 10% of 10% bensulfuron-methyl WP, or 72% of 2,4-D butyl emulsifier 40-50 ml, and 20% of dimethyltetrachlorohydroxide 100 ml per acre.

V. Strict control of the period of drug use During the period from the four-leaf stage to the period before jointing, the drug is the strongest, which is the best period for drug use. When spraying, choose sunny and windless weather, spray at 8 to 11 in the morning and 3 to 5 in the afternoon. The temperature is below 10 °C ~ 18 °C, and medication is strictly prohibited.

Sixth, choose the appropriate method of application of herbicides There are two kinds of herbicides: spray and smear. 1 Use the spray method to change the nozzle downwards to spray obliquely forward, so that the liquid is sprayed more into the soil gap. 2 Spread the medicine sand, dilute with 2~3 liters of 72% 2,4-D butyl ester emulsifiable concentrate, 30-40 kg of fine sand, mix well and scatter in the wheat field. This method is simple and easy, and does not use spray equipment.
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