After the summer heat, the sweet potato roots entered the peak of swelling, and cracks began to appear on the ridges of the potato fields. At this time, the anti-sweet potato cracking fertilizer was applied at a time to meet the needs of root tuber for nutrients and increase the sweetness of the potato chips and increase production by 20% to 30%.
The following three points are needed to prevent cracking fertilizers: First, select fertilizers. With a fast-acting nitrogen and phosphorus mixture as a good solution, the general mu urea 4-5 kilograms, superphosphate (leaching solution) 10 kilograms, add water 250-300 kilograms, but also can use rot lean hot and thin human urine 750 kilograms add water 750 kilograms, Pour in the evening. The second is the fertilization time. Should be to see the cracks, leaf color, variety and then determine fertilizer time. If cracks begin to appear in the ridges of the potato fields and the leaf color becomes light, the fertilizer can be topdressed. Early-maturing varieties were early top-dressed and late-maturing varieties were top-dressed late. The topdressing time is usually appropriate after the "summer heat" and before the "white dew"; the autumn sweet potato is appropriate after the "white dew" and before the "equinox". The third method is fertilization. Choose cloudy or sunny evenings. Fertilizer should be fully mixed, and according to the weather and dry and wet conditions of the soil to prepare a good concentration of fertilizer, sunny days dry should be more thin, Tianyin wetting should be thicker. It is necessary to chase ridges and ridges one by one along the cracks to make them uniform and avoid leakage. While applying cracking fertilizer, 100 kg of plant ash per acre is applied to supplement potassium, which can increase the effect of applying cracking fertilizer.
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