There are two options to choose from:
First, spraying 2 to 3 times of 0.3% to 0.4% potassium dihydrogen phosphate solution in the later stage , or using a filtrate filtered with water ash or superphosphate.
The second is to apply 1 to 2 times of 10 kg to 15 kg of high-nitrogen compound fertilizer. The fertilizer has good water solubility, which is equivalent to fertilization.
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