From late August to early October, sweet potato root expansion was planted in spring and summer. This period is the key period for the formation of yield, and it is the period with the most need for fertilizer. The application of large-scale fertilizer in a timely manner has a significant increase in production.

After applying the cracked sweet potato sweet potato block into the expansion period, 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 can be increased by about 30% after applying cracking fertilizer. The time for sweet potato to apply cracking fertilizer is generally performed when there is a crack in the surface. Specific should be based on the growth of sweet potato and soil conditions. For example, if the fertilization is insufficient in the previous period, the soil is thin and the plant growth is poor, the field may be applied as early as possible, and the amount of topdressing fertilizer per acre may be 800-1000 kg of decomposed human or animal manure, or 6-7 kg of urea. 600 kg, Shun crack application. If there are sufficient fertilizers in the early stage and the plants grow vigorously, you can use 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.

Foliar sprayed sweet potato into the late growth stage, the root absorption capacity weakened, can be classified as spray fertilizer. 0.5% urea solution may be sprayed on weak hilly slopes, plain sands, or fields with premature aging; 0.2% potassium dihydrogen phosphate may be sprayed on fields with prosperous vegetation and high fertility levels. 2%-3% of superphosphate soaking solution; 0.4%-0.5% of urea and potassium dihydrogen phosphate mixture can be sprayed on the general field, sprayed once every 7-10 days, and sprayed 2-3 times. Each spray of fertilizer fertilizer 70-100 kg per acre, sunny evening is appropriate.

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