In September, when sweet potato root swelling occurred and cracks appeared in the surface soil layers, irrigation of cracked fertilizers could promote the expansion of sweet potato roots. Fertilizers that can be used for grouting are: 750-1000 kilograms of human waste per acre, mixed with 500 kilograms of clean water, and then quilted at around 5 pm. 500 grams of potassium dihydrogen phosphate per acre, first dissolved in warm water, then mixed with 500 kilograms of water, water in the cracks. 2.5 kg of urea per mu, 10 kg of superphosphate, dissolved in a small amount of water, and irrigated with 500 kg of water. After dissolving 100 kilograms of ash per acre, soak for 5 hours, remove impurities, and irrigate 500 kilograms of water. In addition, it is worth noting that no matter which of the above methods is used to irrigate the roots, the action must be slow. After the fluid is applied, cracks should be immediately sealed with fine topsoil. This will reduce the exertion of fertilizer effect and the evaporation of moisture, and it will also be resistant to water. The role of dry seedlings. In the late growth stage of sweet potato, apply 3%-5% superphosphate solution or 0.3% potassium dihydrogen phosphate solution 75-100 kg per acre root.
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