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What are the four key points of field management for sweet potato cultivation?
First is topdressing to promote seedling growth. Cultivate 7-10 days after planting; per mu, use 20-30 loads of human and livestock manure water mixed with 10-15 kg of ammonium bicarbonate or 5 kg of urea (preferably 7-10 kg of 40% high-efficiency compound fertilizer) to irrigate the planting holes; at the same time, per mu, apply 100-150 kg of plant ash mixed with 25-30 kg of superphosphate between the holes, do not