In recent years, due to the untimely prevention of weeds and even the lack of prevention and control period, due to the unreasonable use of pesticides and inappropriate control techniques, the application of herbicides to winter wheat is not effective. Therefore, it is very important to effectively control weeds occurrence, use herbicides and apply the correct weed control techniques to effectively control weeds in wheat fields.
I. Characteristics and hazards of weed occurrence in wheat fields
1. Due to the change of the farming pattern, the deep plowing is changed to rotary plowing.
2. The cross-region operation of the harvesting machine spreads the weed seeds in different places.
3. A single herbicide species, weeds produce resistance.
4. Farmers are afraid to give up the cure when they are afraid of the drift of the liquid.
5. Many years of re-grasping and other reasons caused the occurrence of wheat field weeds in a large area, many varieties, high propagation coefficient, rapid spread, heavy damage and other characteristics. Some wheat fields are as high as 600-1000 weeds per square meter, 4-6 varieties, serious enough to see more weeds and less wheat. These weeds and wheat compete for nutrition, compete for water, compete for light and compete for space resources. The historical data prove that the wheat weeds are not cured well, generally reducing production by 10% to 15%, and severely reducing production by 40%. Therefore, the control of wheat weeds should be highly valued, and we should grasp the timing of the eradication and eradication of weeds and herbicides. We must adopt the correct spraying method and completely clean the wheat field weeds.
II. Types of Weeds in Wheat Fields Wheat field weeds mainly include broad-leaved weeds such as Artemisia halodendron, leeks, pigweed, and lacquer, and gramineous weeds such as Aegilops corniculatum, Alopecurus and wild oats. The resistant weeds were 4 species of Artemisia halodendron, Aegilops tauschii, Bromegrass and Wild oats, accounting for more than 80% of the damage area.
Third, the wheat field weed occurrence law Winter wheat field weed sprout in the field there are two peaks. The first peak period is predominantly pre-winter, which occurs about 15 to 25 days after sowing and is more than 10 days after wheat was excavated, that is, in mid-November. The general year of emergence of weeds accounted for more than 80%, but Wheat is faster and more productive. The second is the peak of emergence with the emergence of wheat seedlings returning to green weeds in March of the following year.
Fourth, to grasp the appropriate period of control According to the growth law of wheat weeds, wheat weed control period can be divided into two prevention and control period is the first phase of the autumn period, that is, the growth of wheat 3 to 6 leaf stage, that is, weeds 2 ~ At the 5th leaf stage (about mid-November), it is the best time for chemical weeding in weeds in wheat field. At this time, most of the weeds in wheat fields are unearthed. The grass has a small resistance to insecticides, and the control effect is good. The primary control of weeds in the whole growing period is basically a drug use. , And the application of pesticides is early, the interval is long, the herbicide residue is small, the impact on the crop after the crop is small. However, due to early snow in 2009, basically missed this period. The second is the spring season, that is, the return of green wheat. The use of medication before the jointing of wheat is the last addition to the weeding of wheat fields.
5. The “Tianwei†double insurance for weed herbicides has strong internal conductivity and can be absorbed by the stems, leaves and roots of weeds. It is used for fast weeding of annual broad-leaved weeds in wheat and is not subject to temperature restrictions. No drift, no rebound, no harm to the surrounding crops, no effect on the next crop, wheat is the preferred herbicide. Two sets of per acre, the effect is excellent.
Sixth, adopt the correct spraying method
1. Select to spray at sunny noon above 5°C.
2. The application of secondary dilution method. First, add a small amount of water to the mother liquor, pour it into a sprayer that contains some water, and fill it with water.
3. The effect of spraying 30-45 kg of water per mu of wheat field will be good.
4. Sprinklers are 20 cm high from wheat seedlings and weeds, and are too high for easy drift. To do not miss the spray does not spray.
5. Increase the amount of water spray when the wheat field is dry, and do not water immediately after spraying.
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