Fertilizer varieties are suitable for many types of fertilizers, but some are suitable for foliar spraying and some are not suitable for foliar spraying. Such as urea, potassium dihydrogen phosphate, borax, ammonium molybdate, zinc sulfate, etc. can be sprayed. Some chlorine-containing, volatile and insoluble fertilizers cannot be used for foliar applications such as ammonium chloride, ammonium bicarbonate, calcium magnesium phosphate, etc. The spray concentration should be suitable for the top-dressing according to the different fertilizers sprayed with the appropriate concentration. Urea 1%~3%, potassium dihydrogen phosphate 0.3%~0.5%, borax 0.1%~0.2%, zinc sulfate 0.2%~0.4%, ammonium molybdate 0.03%~0.05%, superphosphate leaching solution 2%~4% Ammonium sulfate 0.2% to 0.3%. To be targeted according to crop and soil nutrient-free conditions, in accordance with the principle of missing what supplement to spray. If the seedlings are thin and yellow, indicating that nitrogen deficiency, nitrogen spray should be the main; if the seedlings are generally long, should be sprayed with nitrogen, phosphorus-based mixture; if the seedlings look green, should be sprayed with phosphorus, potassium-based mixture. To spray different crops at different stages of the crop during the fertilizer-needed period is different for different fertilizers, and it is necessary to be flexible. For example, rice and wheat should be sprayed after full bloom; soybeans, peanuts and rape should be sprayed at the beginning and full flowering stages; corn and sorghum should be sprayed at the grain filling stage; sweet potatoes and potatoes should be sprayed during the fruit expansion period. The spraying site must be the absorption capacity of the leaf. The new leaf is stronger than the old leaf. Monocotyledonous crops such as rice, wheat, etc., have almost the same stomatal stomata on the leaves, and the leaves are easily affixed with fertilizer solution. The fronts of the sprayed leaves should be dominant, while the stomata of the dicotyledonous plants such as soybean and cotton are more than the leaves. And the sponge tissue on the back of the leaves has a strong ability to suck up fertilizer, and both sides of the leaves should be sprayed. It is best to select fertilizers with fertilizers that are applied outside the roots in relatively humid weather. Sunny days should be sprayed before 10 o'clock in the morning and after 4 o'clock in the afternoon. In cloudy and windless weather, it can be sprayed all day. To add active agent Add a small amount of active agent (such as neutral soap, washing powder) to reduce the surface tension of fertilizer solution, which is conducive to the spread and depth of fertilizer solution and improve the spraying effect.
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