2 parts of fertile topsoil not planted with cucurbits can be used, 1 part of decomposed animal manure is added, and the excrement is fine, sieved and mixed. In addition, 1.5 kg of diammonium phosphate and 0.5 kg of potassium nitrate are added per cubic meter of soil. Add water to the sprayer, and spray the edge while mixing with the dirt. Then add 0.5 kg of biological potassium fertilizer per cubic meter of soil and mix well.
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