After the end of August, it is the peak period of summer sweet potato and potato tubers entering the expansion. At this time, we should pay close attention to the application of crack fertilizer.
On the one hand, it satisfies the nutrients needed for the expansion of potato chips, while preventing premature senescence of stems and leaves, enhancing photosynthesis and increasing nutrient accumulation.
Summer sweet potato chasing crack fertilizer, generally can increase production by 25% to 30%. The time for the application of crack fertilizer in summer sweet potato is generally 70 to 80 days after planting, and the potato block enters the peak period of swelling, and the crack occurs when the surface of the potato is cracked. The specifics should be based on the growth of summer sweet potato and soil quality. For example, in the early stage, the fertilizer is insufficient, the soil layer is shallow and the plant growth is poor, and the field can be applied as early as possible; the amount of topdressing can be 800-100 kg per person of 179 square meters of decomposed manure, or 6 to 7 kg of urea. 600 kg of water, sloping cracks. If the field with sufficient fertilizer 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. At the same time, in the later stage of growth, 0.3% to 0.4% potassium dihydrogen phosphate solution or 5% to 8% of ash ash leaching solution can be used. After 5 pm on sunny days, the foliage is sprayed, sprayed once every 7 to 10 days, and continuously sprayed. 2 to 3 times.
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