I. Can urea be soluble in water and then fertilized?
Urea is generally spread on the ground, and it can also be used as a foliar fertilizer. The urea is water-soluble and then sprayed on the foliage, so the urea can be water-soluble before fertilizing.
Water-soluble urea generally needs to choose the appropriate concentration according to the needs of the application of crops, and then put it into a watering can, and spray it in the morning or evening every day. When spraying, it is mainly sprayed on the back of the leaves.
Second, what is the appropriate ratio of urea to water
There are various ways to use urea, such as foliar spraying or root irrigation after adding water. Yes, but pay attention to control the water ratio of urea, so how much water is suitable for urea?
When urea is mixed with water for foliar fertilizer spraying, it is mainly selected according to different crops:
1. The urea solution sprayed on wheat, corn and other cereal crops has a concentration of 1.5-2%, usually diluted 500-650 times. One mu of land needs 15-20 kg of urea solution. The ratio is 100 kg of clean water and 1.5-2 kg of urea granules. After dilution, spray.
2. The concentration of urea solution sprayed on leafy vegetables and melon vegetables is 1.5-2%. Generally, urea is diluted 650-1000 times. One mu of land needs 20-30 kg of urea solution. , the proportion of the ratio is 100 kg of clean water, add 1-1.5 kg of urea particles, and spray after dilution.
3. For solanaceous vegetables such as tomatoes, peppers and eggplants, the concentration of spraying urea solution is 0.3%, and the urea is diluted 3300 times. One mu of land needs 20-25 kg of urea solution. Add 0.3 kg of urea granules to 100 kg of clean water.
4. When watering flowers, the spray concentration should be 0.02-0.2%, and the urea spray concentration of seedlings should not exceed 0.2%.
Three, the harm of high concentration of agricultural urea
After the agricultural urea is mixed with water, it is usually foliar spraying or root irrigation. It will cause harm to crops: when foliar spraying, if the concentration is too high, it will cause damage to the leaves, the phenomenon of leaf burning will occur, and the photosynthesis of the leaves will be affected; when the concentration is too high, the seedlings will be burned. .
