Occurrence and Chemical Control Techniques of Weed in Wheat Field
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According to practice, the key to doing a good job of chemical weed control in wheat fields is to clarify the types of weeds and their occurrence patterns, to grasp the appropriate period of drug use, and to achieve proper remedy. Now introduce its law of occurrence and chemical control technology. First, the law of the occurrence of weeds in wheat fields: The first time in the autumn of mid-October, the weeds that occurred were Maijiagong, sow wormwood, quail, porcupine, bryophyte, broodstock, lacquer, The summer solstice grass and the geese do not eat grass. All of them are weeds. The majority of these weeds are naturally dead in winter. Most of them can safely pass through the winter and bloom in the coming April to May. The second peak is in late spring from the end of March to early May. In addition to the above-mentioned several weeds can continue to occur, there are gray gray dishes, flat storage, purslane, Xanthium and other occurrences. These weeds bloom, mature and mature before the harvest. In general years, the occurrence of weeds is mainly in autumn, and the occurrence of weeds accounts for about 80% of the total. It has a high density of occurrence, a long symbiotic period with wheat, a serious harm, and a great impact on wheat. Second, weeds in the wheat field of chemical control technology: 1, wheat field weeds chemical control strategy is the prevention and control of autumn wheat in the tillering period, supplemented by the spring wheat return to the prevention and control of the small early in the principle of governance. This is because autumn wheat is applied during the tillering stage. Most of the weeds have emerged, with small weeds, weak roots, and poor resistance to the drugs. Applying a small amount of the herbicide yields an ideal herbicidal effect, and the wheat seedlings have strong resistance. Safe for wheat. In the spring, since the weeds have grown, the roots are developed, the drug resistance is enhanced, and the amount of wheat seedlings is increased, so that a large amount of medicinal liquid is retained by the wheat leaves, and only a small part of the liquid spray is sprayed on the weeds. It helps to increase the weeding effect. 2. Chemical control technology for wheat field weeds. In the case of plots dominated by weeds such as sow wormwood, medlar, lacquer, burdock, etc., 72% 2,4-D butyl ester emulsion can be used per 50ml of 667m2 or 20% of it to make it long-lasting emulsion per 667 Square meter 50-60 ml, spraying 30 kg of water on weeds for 2 to 3 leaf phases. When 2,4-D butyl herbicides are used, care should be taken to avoid the chemicals floating over sensitive crops nearby. The sprayer must be dedicated and must not be used on dicot crops to prevent phytotoxicity. For wheat fields dominated by Flourish, Pork, Wheat, etc., 75% of the superstar dry suspension agent can be used for 1 gram per 667 square meters, or 10% phenylpropanol WP for 10 grams per 667 square meters; or The ideal weeding effect can be achieved by applying 20% ​​of its Long Cream to 50-60 ml per 667 square meters, spraying 30 kg of water to the weeds at the 2 to 3 leaf stage. For a variety of weeds mixed with wheat, herbicide mixing technology can be used, for example, can be used McNangle 1+1 (benzotrinone powder) can also use 2,4-D butyl ester and its use of mixed and so on.