In the later stage of yam, it is difficult to dissolve the phosphorus and potassium compound fertilizer, and it is not good to open the ditch and cover the soil. What should I do?

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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