Chemical weeding in wheat fields has become a routine agricultural activity. The applied area accounts for more than 80% of the planting area. However, due to the selection, application method or application period of herbicides, the phytotoxicity or weeding effect of wheat is not good. The author believes that the following three aspects of chemical weed control in wheat fields should be noted: There are two optimal periods for controlling weeds in wheat fields to prevent weeds in wheat fields, namely before winter and spring. (1) Before winter: After the emergence of wheat, the weeds are used in the 3rd to 4th stage of the weeds, the wheat seedlings are not divided, the field coverage is low, the grass is small, and the drug resistance is poor. At this time, the herbicidal effect is good and the efficiency is high. (2) Spring: In the upper and middle of March of the next year, before the wheat jointing, the weeds are used in the 3rd to 4th stage of the weeds. It is strictly prohibited to use the medicine after the jointing of the wheat, which may cause different degrees of phytotoxicity. Whether it is winter or spring, it is advisable to use the medicine when the soil is wet. It is used from 9:00 am to 4:00 pm on sunny days. The temperature is high and the light is sufficient to enhance the ability of the grass to absorb liquid medicine. The spray should be thoughtful, the wheat field herbicide is a weed stem and leaf treatment agent, the grass body does not take the medicine, which is equal to invalid, and the water consumption per mu is not less than 30 kg.
Chemical weeding methods in wheat fields (1) Control of broadleaf grasses: such as wheat artemisia, amaranth, succulent mustard, wheat grass, Wang Wuliu, piglet, sorghum, etc., 75% of superstar dry suspension can be used per acre.克～1.4g or 10% benzosulfuron (McMulberry, Melaleuca, McKale, Wheatgrass, etc.) wettable powder 10g～15g or 10% thiasulfuron (wheat grass, wheat field green, etc.) The wettable powder is 10 g to 12 g, and the water is 30 kg to 45 kg (that is, the knapsack sprayer is 2 barrels of water to 3 barrels of water), and the grass is evenly sprayed. Adding 0.2% detergent to the liquid can improve the efficacy. (2) Control grasses: such as wild oats, see Mai Niang, etc., use 6.9% Huma concentrated emulsion 50 ml ~ 60 ml per mu, the same method. (3) If mixed with broadleaf and grasses, spray with the above agents. (4) If weeding with 72% 2,4? butyl ester, only in addition to broadleaf grass, it should be used before winter, the method is as follows: 40 ml of mu, 30 kg of drug sand, evenly spread in the field. Spring application should be used early, and it is easy to make wheat ears deformed after jointing. 72% 2,4?D butyl sulphur is not sprayed unless there is a special sprayer. The sprayer should not be used for spraying cotton fields or vegetable fields no matter how it is cleaned. (2,4-D butyl ester herbicides are sensitive to cotton and vegetables, and are easy to produce chicken claw-like phytotoxicity).
Manual compression sprayers with appropriate spray equipment can not be used with motorized sprayers to avoid waste of liquid medicine and cause damage to adjacent crops.
Chemical weeding methods in wheat fields (1) Control of broadleaf grasses: such as wheat artemisia, amaranth, succulent mustard, wheat grass, Wang Wuliu, piglet, sorghum, etc., 75% of superstar dry suspension can be used per acre.克～1.4g or 10% benzosulfuron (McMulberry, Melaleuca, McKale, Wheatgrass, etc.) wettable powder 10g～15g or 10% thiasulfuron (wheat grass, wheat field green, etc.) The wettable powder is 10 g to 12 g, and the water is 30 kg to 45 kg (that is, the knapsack sprayer is 2 barrels of water to 3 barrels of water), and the grass is evenly sprayed. Adding 0.2% detergent to the liquid can improve the efficacy. (2) Control grasses: such as wild oats, see Mai Niang, etc., use 6.9% Huma concentrated emulsion 50 ml ~ 60 ml per mu, the same method. (3) If mixed with broadleaf and grasses, spray with the above agents. (4) If weeding with 72% 2,4? butyl ester, only in addition to broadleaf grass, it should be used before winter, the method is as follows: 40 ml of mu, 30 kg of drug sand, evenly spread in the field. Spring application should be used early, and it is easy to make wheat ears deformed after jointing. 72% 2,4?D butyl sulphur is not sprayed unless there is a special sprayer. The sprayer should not be used for spraying cotton fields or vegetable fields no matter how it is cleaned. (2,4-D butyl ester herbicides are sensitive to cotton and vegetables, and are easy to produce chicken claw-like phytotoxicity).
Manual compression sprayers with appropriate spray equipment can not be used with motorized sprayers to avoid waste of liquid medicine and cause damage to adjacent crops.
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