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1, urea
Commonly used spraying concentration of 1% to 1.5% (ie 100 kg of water plus 1 to 1.5 kg of urea); in this range, dicotyledon, the concentration can be suitably lower; monocotyledon, the concentration can be suitably higher; seedling stage The concentration may be suitably lower; in the seedling stage, the concentration may be suitably higher.
2, through the calcium phosphate
The commonly used spraying concentration is 2% to 3%; the fertilizer should be thoroughly stirred after adding water, and after standing for 24 hours, it is filtered, and the clear liquid is sprayed.
3. Potassium dihydrogen phosphate
The commonly used spraying concentration is about 0.3%; the preparation method is to take 300 g of potassium dihydrogen phosphate plus 100 kg of water, fully dissolved and sprayed.
4, potassium sulfate
The commonly used spraying concentration is 1% to 1.5%.
5, zinc sulfate
The commonly used spraying concentration is 0.1% to 0.2%; a small amount of lime liquid is added to the solution and then sprayed.
6, borax (or boric acid)
The commonly used spraying concentration is 0.2% to 0.3%; when preparing the solution, the borax is first dissolved with a small amount of 45 ° C hot water, and then the water is added.
7, grass ash
The commonly used spraying concentration is 3% to 5%; after adding water with grass ash, stirring, standing for 15 hours, filtering and reuse.
Suitable concentration of commonly used foliar fertilizer
Fertilization of crops on the foliage is also called top dressing. It is an effective way to quickly supplement nutrients, remove the physiological diseases caused by lack of nutrients, promote crop growth and increase yield. The concentration of foliar fertilizer is very important. The concentration is too high, which not only causes fat damage, but even “burns†the damaged leaf surface and tissue, and the trace elements such as too high concentration may cause poisoning; while the concentration is too low, the fertilizer effect is not obvious. The appropriate concentrations of several commonly used foliar fertilizers are described below.
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