The hole eye dressing with a piece of wood hoe, in its 20-30 centimeters away from its main root, playing a hole about 30 cm deep, into the appropriate amount of three-element compound fertilizer, sealed with wet soil, if a hole in each side of its ridge The effect is better. The top dressing of cracks is sweet potato root swelling in September, when the surface layer of soil cracks, irrigation cracking fertilizer can promote sweet potato root swelling. Fertilizers that can be used for perfusion are: 750-1000 kg of human waste per acre, mixed with 500 kg of fresh water, and then quilted at about 5 pm; 500 g of potassium dihydrogen phosphate per acre, dissolved in warm water, then mixed 500 kilograms of fresh water is poured into the cracks; 2.5 kilograms of urea and 10 kilograms of superphosphate are used per acre. After dissolving with a small amount of water, 500 kilograms of water are poured into the roots; after dissolving with 100 kilograms of ash per acre, soak for 5 hours. Filtration of impurities, watered 500 kg Irrigation. In addition, it is worth noting that no matter which of the above methods is used to irrigate the roots, the action should be slow. After the fluid is applied, the cracks should be immediately sealed with fine topsoil, so that the volatilization of the fertilizer effect and evaporation of the water can be reduced, and the resistance can be reduced. The role of dry seedlings. There are many types of foliar fertilizers for foliar dressings suitable for sweet potato spraying. Commonly used are 1%-2% urea solutions, 2%-3% superphosphate extracts, 5%-10% ash extracts, 0.3% potassium dihydrogen phosphate solutions. Wait. Spraying time, the day is about 5 pm, generally 75-100 kg per acre spray, every 5 to 7 days and then spray once, and even spray 2 or 3 times. Striped Bonito,Sarda orientalis,Fresh Striped Bonito,Fresh Sarda orientalis Zhoushan Boda Aquatic Products Co.,Ltd , https://www.baida-aquatic.com