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After chasing the cracked sweet potato tubers into the expansion period, the cracking fertilizer should be applied. On the one hand, it can satisfy the nutrients needed for the expansion of potato chips, and promote the expansion of the roots; on the other hand, it can prevent premature senescence of stems and leaves, enhance photosynthesis, and increase nutrient accumulation. According to the test, when sweet potato is applied to crack fertilizer, it can generally increase yield by about 30%. The time when the sweet potato is applied to the cracked fertilizer is generally carried out when cracks appear on the surface. The specifics should be based on the growth of sweet potatoes and soil conditions. For example, in the early stage, the field of fertilization is insufficient, the soil layer is shallow and the plant growth is poor. The field can be applied as early as possible. The amount of topdressing can be applied to the decomposed human and animal manure 800 to 1000 kg per acre, or 6 to 7 kg of urea. 600 kg, sloping cracks. If the field with sufficient fertilization in the early stage and strong plant growth can be applied less or only soil fertilizer and potassium fertilizer, no nitrogen fertilizer. Immediately after topdressing, the soil was plucked, and the soil was crushed in the trench to be cracked at the crack in the surface.
Foliar sprayed sweet potato enters the late growth stage, and the root absorption capacity is weakened, which can be classified into foliar spray fertilizer. For the weak hilly slopes, plain sands or fields with premature aging tendency, 0.5% urea solution can be sprayed; for the fields with high growth potential and high fertility level, 0.2% potassium dihydrogen phosphate solution can be sprayed or 2% to 3% of superphosphate leaching solution; 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture can be sprayed on the general field, sprayed once every 7 to 10 days, and even sprayed 2 to 3 times. It is appropriate to carry out 70 to 100 kilograms of spray fertilizer per acre every day.
Sweet potato swell
From late August to early October, it is the key period for the formation of sweet potato roots in spring and summer. This period is the key period for the formation of yield, and it is the period when fertilizer is most needed. It is timely to pursue the application of bulk fertilizer and has a significant effect of increasing yield.
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