Watermelon is a very sensitive crop for herbicides. If improper herbicides are applied in watermelon fields, it will lead to a reduction in yield and yield. Therefore, watermelon field must be carefully selected and operated strictly in terms of selection of herbicide species, use time, dosage and method.
First, the correct choice of herbicides, grasp the application dose
There are many types of herbicides available for watermelon production. The commonly used types and application doses are: 48% trifluralin dosage 75-125 ml, 72% Dole EC 50-80 ml, and 33% weeding pass 80-130 Milliliters, 48% of Diolecamine Acre 200ml, 12.5% ​​Gaifu Amount 65-150ml, 15% Stereo Acres 75-130ml, 15% Accurate Kill Mu Amount 50-60ml, 48 Percentage of 150-200 milliliters of mussolin, and 65-100 milliliters of 10% gram-gram-mu, 40-50 kilograms of fresh water, respectively, were sprayed on the surface of the soil before the watermelon seedlings were transplanted. The trifluralin herbicide is easy to decompose after seeing the sun, and after spraying, the gingivae can be used to evenly spread the medicine and the depth is 5-7 cm so that the medicinal effect can be fully exerted. The spraying time was better with pre-emergence application of weeds, and grass weeds were applied at the 3-5 leaf stage. In order to prevent perennial weeds, we can use 200-400 ml of 41% glyphosate solution, spray 20-30 kg of clear water, spray on the nozzle of the sprayer, and spray with a protective cover to prevent the liquid from falling to the melon. Leaves phytotoxicity on the leaves.
Second, because of the application of time
The effect of applying herbicides on watermelon fields is related to the ecological environment. For example, herbicides applied to sandy loam soils are more effective than clay, but the viscous soils are safe after application, and the concentration of sandy loam soils is too large to cause phytotoxicity. Different accurately grasp the amount of medication. When the temperature rises above 20°C, the effect of killing the grass is better. When the temperature is not high in the spring, the dosage should be increased appropriately, and in summer when the temperature is high, the dose should be reduced as appropriate. When the soil moisture is good, the grass-killing efficiency is high. When the moisture level is poor, the grass-killing effect is reduced. The drug should be selected when the moisture is good.
Third, timely relief of injury
When a drug is inadvertently caused by drug use, measures must be taken to ease it. 1. Spray Huimanfeng or Zhuang Fuxing active liquid fertilizer 800-1000 times; 2. Spray and promote long-type plant growth regulator "802" (loving more potassium) 2000 times; 3. Spraying 0.05% 920 ( GA3) solution; 4 acres with 0.01% Tianfengsu (brassica lactone) EC 10 ml, spraying 30-40 kg of clean water.
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