After sweet potato enters the root swelling phase, it should pay close attention to cracking fertilizer. On the one hand, it can meet the nutrients needed for tuber enlargement and promote the expansion of tuberous roots; on the other hand, it can prevent premature aging of stems and leaves, enhance photosynthesis and increase nutrient accumulation. According to experiments, sweet potato topdressing crack fertilizer can generally increase production by about 30%. The time for applying sweet potato cracking fertilizer should be based on the growth of sweet potato and soil conditions. Pre-fertilization, thin soil, and poor plant growth can be applied as early as possible. Each mu can be applied to decompose human and animal manure water 800-1000 kg, or urea 6-7 kg water 600 kg. , Shun cracks applied. Plants with adequate early fertilization and vigorous plant growth can be treated with less or only earth fertilizer and potash and no nitrogen fertilizer. Immediately after topdressing, soil is cultivated. The soil in the trenches is broken and ploughed into the cracks on the surface.
After the sweet potato enters the late growth stage, the root absorption capacity is weakened and the foliar spray can be classified. In areas with weak hilly slopes, plain sandy land, or fields with premature aging, 0.5% urea solution can be sprayed. Fields with prosperous vegetation and high levels of fertility can be sprayed with 0.2% potassium dihydrogen phosphate solution or 2%-3% of superphosphate leaching solution; general field, can spray 0.4%-0.5% of urea and potassium dihydrogen phosphate mixture, spray once every 7-10 days, even spray 2-3 times, each 70-100 kilograms of spray fertilizer per acre is suitable for sunny evenings.
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