Fertilizer selection should generally select fertilizers that can quickly enter the leaves, such as ammonium sulfate, ammonium nitrate, potassium chloride, potassium sulfate, calcium superphosphate, and ammonium phosphate. Fertilizer concentration is generally high concentration, such as urea is 0.3% -0.5%, potassium sulfate is 0.6% -1%, ammonium phosphate is 0.3% -0.5%, magnesium sulfate is 0.3 = 2% -0.3%. Adding active agent to add detergent, soap and other surfactants in the fertilizer solution can reduce the surface tension of the fertilizer solution, which is beneficial to improving the spraying effect. The fertilization time is usually when the fruit tree needs the most elemental spraying. The amount of boron needed for the full flowering period should be sprayed with borax in time. Usually do not apply urea flowering, can be sprayed 10 days after flowering. Before the critical period of spraying calcium fertilizer spraying site, calcium fertilizer should be sprayed on the fruit. The back sucking fertilizer is faster than the leaf surface, therefore, the effect of the leaf back spraying is better than the leaf surface spraying.
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