The application of wheat chemical weeding technology in our city has become more and more mature, but there are always some problems every year. The main problems are the problems of drug injury and the problem of unsatisfactory control efficiency. We now attribute the common problems and precautions in the application of wheat herbicides in our city. as follows:
1. Large amounts of herbicides such as Jiahuanglong and Shuanghuanglong (a net once for wheat) have a large impact on crops such as post-planted corn, watermelon, soybean, and cotton, often resulting in dry crops of corn, watermelon, and soybean seedlings. even death. Therefore, it is forbidden to use forsythiaside and Shuanghuanglong herbicides in the wheat fields of the above-mentioned crops and should be replaced with prometryn and butachlor. Alkaloids and Shuanghuanglong are restricted to transplanted paddy fields and should not be used in excess. Some fields use excessive amounts of Astragalus and Shuanghuanglong, which often cause the emergence of live rice seedlings that are not fully emerged and die.
2. The amount of pomegranate used is too large or the application is uneven, resulting in yellowing of the wheat leaves, stagnation or even death. The dose of 50% paracetamol should be controlled between 75g and 100g. The wet plots should be given in low doses, the dry plots should be given in high doses, and they should be evenly distributed in the 2-3 leaf stage and 1-2 leaf stage of the wheat seedlings. spray. Re-injection is strictly prohibited.
3. Hummer control Wheat grass weeds in wheat field should be in the 4th and 5th leaves of wheat. It is best to look at the 3-5 leaves of grassy weeds such as aegis, which must not be used in barley fields. Spray evenly and do not spray again. Last year, there was a farmer who had been spraying heavily because of spraying unevenly and where there was so much grass, causing damage to the wheat leaves. In addition can not be mixed with dimethyl tetrachlorm and other hormone herbicides to avoid phytotoxicity.
4. Excessive use of dimethyl tetrachlorine or use at low temperatures caused the chlorosis and yellowing of wheat leaves, the new leaves were onion-like, the curl of the ears was difficult to extract, and the malformed ear appeared. Dimethyl tetrachlorine is best used in the early spring wheat will be jointing un-joined, when the temperature is low, poor control and easy to produce phytotoxicity.
5. When using Astragalus, Shuanghuanglong, butachlor, prometryn herbicides, etc., we must pay attention to the quality of the site preparation, be sure to level the entire fine, or weeding effect is certainly not good. In addition, pay attention to the sensation. When the soil is too dry, it should be irrigated to make the soil wet, and then drain the water and then use the medicine. The weeding effect is poor in dry years, and the phytotoxicity is likely to occur in the rotten winter season. When using drugs, the soil moisture must be used to determine the dosage.
6. Note that the two do not spray: First, the sick and weak seedlings do not spray, and the second is not spray before and after cold air strikes. Chemical herbicides have more or less some influence on crops. If you do not pay attention to the above two sprays, it is very easy to produce phytotoxicity.
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