With the change of the farming system and the influence of climatic factors, great changes have taken place in the weed communities in wheat fields. The number of vicious weeds in the wheat field in the wheat fields has increased and the scope of occurrence has been continuously expanding. They compete with wheat to compete for water, win light, and compete for space. As a result, individual development of wheat has been impaired, the population structure has become smaller, and the uniformity of wheat in the field has decreased, which has led to a decrease in wheat yield and a decline in quality, and has seriously affected wheat production. The area in our county has reached more than 100,000 mu, with an average density of 38 plants per square meter, and the highest density is more than 100 plants. All townships in the county have occurred in varying degrees. The peak period of weeds sprouting in the field is generally more pre-winter, small weeds before winter, and easy to control, so the pre-winter weed control is a critical period for weed control.
1, the correct choice of suitable herbicides.
(1) Broad-leaved weed control. In my county, we mainly use broadleaf weeds such as sow wormwood, leeks, and wheat straw, and we can use double fluorine 2A 4 chlorine, 2g 4g chlorine, 80g per mu, and even spray of 30kg water. .
(2) Control of grass weeds. For the wheat fields dominated by bromegrass, priority was given to prevention and control in Suining. The wheat fields dominated by the thallus were selected for prevention and treatment. The wheat fields dominated by gramineous weeds such as apricots and wild oats were selected as the thrips. Mu with 3 grams of Suining water 30 kg spray, when dispensing the first use of a small amount of water dubbed mother liquor, according to the dilution of water, stir evenly after the uniform spray.
(3) For the mixed fields of grass weeds and broad-leaved weeds, a mixture of fluorinated 2 A 4 chlorine plus tigris can be used.
2. Several issues need to be noted in the prevention and control:
(1) Weeding time. Usually one month after the winter wheat planting, my county is from late October to early November, with 3-4 leaves of wheat and 2-3 leaves of weeds. The general temperature is not less than 10 degrees.
(2) Scientific compounding. Spray all kinds of herbicides, not verified by experiments, do not spray with organophosphorus pesticides to avoid phytotoxicity.
(3) Safe medication. Strictly control the amount of medication, the period of medication, and the amount of water used. The spray should be even and thorough.
(4) Select suitable weather. Herbicides should not be used in inclement weather.
(5) After the application of drugs to thoroughly clean, so as not to cause damage to other crops.
(6) The removal of the land with poor chemical and weed control effectiveness should be done manually.
(7) Because 2,4-D butyl ester is sensitive to cotton, vegetables, fruit trees and other dicotyledonous crops. After the drug is used, there are residual medicines and then sprayed cotton and other crops are often phytotoxic and need to be used exclusively for medical equipment. Therefore, in wheat fields in the cotton and peanut areas, try not to use 2,4-D butyl esters, especially in the spring, pay attention to cotton, peanuts, fruit trees and other dicotyledonous plant injury occurred.
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