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2. The concentration and dosage of foliar spray fertilizer should be appropriate. The concentration of foliar application should be light in the early stage and should be concentrated in the middle and late stages. The amount of acre used is less in the early stage and more in the middle and late stages. The urea concentration is generally 0.3% to 0.5%, and 750 to 1500 kg per hectare; ammonium nitrate, ammonium sulfate, potassium sulfate concentration is 0.2% to 0.4%, and 1200 to 1800 kg per hectare; potassium dihydrogen phosphate concentration is generally 0.3. %～0.2%, the dosage per hectare is 750～900kg; the concentration of superphosphate leaching solution is generally 1%～3%, the dosage per hectare is 750～1500kg; the concentration of boric acid is generally 0.03%～0.1%, the dosage per hectare is 750 ~1200 kg; grass ash leaching solution, 225 kg of grass ash per hectare, 150 kg of heating water, soak for 1 day and night, filter impurities and add 750-830 kg of water spray.
3. Grasp the time, frequency and focus of foliar spray fertilizer. Foliar topdressing should be carried out on a windless sunny day. It is best to have 3 to 4 days of fine weather after spraying. However, it is generally best to spray in the evening. It is more suitable to spray after the morning dew is dry. After the first spray, Spray once every 7 to 10 days and spray continuously for 3 to 4 times. Foliar spray fertilizer should pay attention to the current use, not long-term release. Try to spread the front and back of the blade evenly to get better yield.
In addition, by spraying two or more kinds of fertilizers or pesticides, it is possible to improve work efficiency and save fertilizer, but it is not possible to mix acidic and alkaline fertilizers and pesticides that cause antagonism. Adding a small amount of active agent (such as neutral soap and washing powder) to the fertilizer can reduce the surface tension of the fertilizer solution, which is beneficial to the spreading and deepening of the fertilizer solution and improve the spraying effect.
From: Modern Rural Newspaper (Jiang Wenhu)
Three points of vegetable foliar topdressing
1. It is advisable to use fertilizer applied by foliar application. Melons, mushrooms, and legumes should be sprayed with phosphorus, potassium, zinc, copper fertilizer, etc., such as potassium dihydrogen phosphate, potassium sulfate, chicken manure and rabbit manure, etc. Improve quality. In the expansion period of potato vegetables, phosphorus-potassium-rich fertilizers such as superphosphate leaching solution, plant ash leaching solution, potassium dihydrogen phosphate, ammonium phosphate, etc. should be sprayed on the foliage. Leafy vegetables should be sprayed with fertilizers with high nitrogen content in the appropriate growth period, such as urea, ammonium nitrate, decomposed human and animal urine, etc., and spray the corresponding trace elements.
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