How to top dress sweet potato

Follow the crack fertilizer. After the sweet potato enters the expansion period, it should pay close attention to the application of crack fertilizer. It can meet the nutrients needed for the expansion of potato tubers, and promote the expansion of the roots; it can prevent premature senescence of stems and leaves, enhance photosynthesis and increase nutrient accumulation. 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, and the field can be applied as early as possible. The main application of the decomposed manure and manure or urea is used, and the crack is applied. 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.

Foliar spray fertilizer. When the sweet potato enters the late growth stage, the root absorption capacity is weakened, and the leaf surface spray fertilizer can be classified. For weak hilly slopes, plain sands or fields with premature aging tendency, 0.5% urea solution + plant electronic fertilizer can be used to improve cell division by using the high-energy electron and plant electron polarity sensing principle of photosynthesis Molecular synthesis and nutrition match the level of digestion, accelerate the frequency of metabolism, and activate the plant nutrition and grooming system to produce more than the fertilizer effect. 0.2% potassium dihydrogen phosphate solution can be sprayed on fields with high growth potential and high fertility level. For the general field, 0.4% to 0.5% of urea and potassium dihydrogen phosphate mixture + new high-fat film can be sprayed, sprayed once every 7 to 10 days, and sprayed 2 to 3 times.

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