Answer: Need to apply nitrogen fertilizer, potassium fertilizer, organic fertilizer, trace element compound fertilizer. Each mus of 15 kg of urea, potassium potassium sulfate 50 kg, trace elements can also be used in conjunction, calcium does not need to deliberately applied, Guanzhong soil is not deficient in calcium, but the soil is mostly alkaline, calcium is not easily absorbed. When fertilizing, pay attention to digging the pit to spread the fertilizer evenly and water it.

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