The spring wheat field weeding should highlight an "early" word. Weeding in spring is an important period for controlling weeds in wheat fields. Herbicides in spring wheat include tribenuron-methyl, fructose oil, and 2,4-D butyl ester. They can be applied from the turning green of wheat to the early jointing stage, but they are generally used during the turn of wheat. Apply before March 15th to avoid adverse effects on the crop. In particular, the sooner the 2,4-D butyl ester is administered, the safer it will be.
In the spring wheat field, weeding and herbicide should be treated according to the symptom. According to different kinds of weeds, herbicides should be selected to improve the weed control effect. At present, Huaixian County uses 75% tribenuron-methyl (70%) tribenuron-methyl (7-1.8 g) and 30-40 kg (30-40 kg) sprays in wheat fields dominated by broad-leaf weeds such as sow wormwood, leeks, and rice wattles; Wheat fields such as wheat, wild oats, and bromegrass are used as the main wheat crops. Mu shall be sprayed with 6.9% Fuma 60-70 ml or 3% Shima EC 25-30 ml of water for 30-40 kg spray; Wild oats and other wheat fields mixed with monocotyledonous weeds and broad-leaved weeds can be added with 6.9% of the 6.9% Fima horse oil in each mu of medicinal liquid used in DuPont Superstars. Both types of weeds can be controlled. For severe cases of swine fever, 20% of the plots are sprayed with 50-60 ml of water per mu, and 30-40 kg of water. 2,4-D butyl ester emulsifier is easy to produce phytotoxicity to the dicotyledonous crops such as sorghum and cotton. In particular, the stumbling crops are cotton plots that do not use 2,4-D butyl ester as the herbicide. The medical equipment that used 2,4-D butyl ester cream should also be washed repeatedly to avoid the occurrence of phytotoxicity when the dicotyledonous crop is used.
In the spring wheat field, weeding must strictly control the dosage, the dosage is too small to affect the effect of weeding, and the excessive use of drugs has strong residual side effects, sometimes causing phytotoxicity to crops. Generally, 72% of the 2,4-D butyl ester emulsifiable concentrate has an application volume of 50 ml per mu; 75% Tribenuron-methyl Suspension (capsulant) is used in an amount of 1 to 1.8 g per mu; 75% DuPont Superstar Dry Suspension Reagent per acre The dosage is 0.9-1.4 g; 6.9% of the dosage of Fuma is 60-70 ml/mu, 3% of the amount of Sima-Emulsifiable Oil is 25-30 ml/mu, and 30-40 kg of water is sprayed. Do not arbitrarily reduce or increase the dose to avoid poor weeding or phytotoxicity.
The conditions for weeding in spring wheat fields are appropriate. The use of herbicides in wheat fields should be applied from 9 am to 4 pm in sunny, windy sunny days. High temperatures, light enough to enhance the ability of the grass to absorb liquid medicine, the wind easily cause liquid medicine drift, spraying uneven, causing damage to other crops (fruit and vegetable). The optimal application temperature of 2,4-D butyl ester cream should be controlled at 15°C or higher.
Spraying should be evenly applied. It is best to dilute the herbicide with a secondary dilution method. Mix the mother liquor first, then dilute it into a liquid solution, and spray it evenly. The amount of water used per mu is not less than 30 kg. .
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