1. Look at the seedlings: During the branching and potato period, the formation of underground root nets, the expansion of the tubers, and the absorption of fertility are strong. To increase the leaf area and increase the photosynthetic production efficiency, it is necessary to fertilize fertilizers early to reach Long-term purpose. Better growth can reduce fertilizer use. If the amount of nitrogen applied to raise the seedlings or the group tree is larger, the potato fertilizer can only be topdressed with potassium fertilizer, and the application of potassium sulfate can be about 10 kg. 2. Look at the time: The potato fertilizer is generally applied about 45 days after the planting. At this time, the ground part has been dumped under the ridge. The potato block has been basically shaped. On the side of the ridge, it is broken with a plough to open 1/3, then applied fertilizer. . Breaking the ridges and fertilizing can improve the ventilation condition of the soil, which is conducive to the expansion of the tubers. The main fertilization is potassium fertilizer. Topdressing potassium fertilizer can make the stems and petioles thicken, keep them young and promote the expansion of tubers. 3. Look at the water: An important principle of sweet potato fertilization is to control the amount of nitrogen fertilizer under good water conditions so as not to cause stems and leaves to grow. In the high-temperature and dry areas in July and August, nitrogen fertilizer should be applied before the drought to promote the mulching of stems and leaves before drought. In autumn and rainy years, the number and frequency of topdressing may be appropriately reduced, and vice versa. 4. See soil quality: sandy soil, good ventilation, but poor fertilizer and water retention performance, fertilizer effect is not lasting, and easy to lose, to increase the application of organic fertilizer to improve the soil, a small amount of fast-acting fertilizer, increase the frequency of top dressing. Viscous soil, due to poor permeability, slow decomposition of fertilizer, but strong fertility, so the amount of fertilizer should not be too small, can be more than appropriate amount of recovery, appropriate to reduce the frequency of topdressing. 5. Sweet potatoes cannot use fertilizers containing chlorine. When ammonium chloride, potassium chloride and other chlorinated fertilizers are used in excess of a certain amount, not only will the starch content of the potato block be reduced, but also the potato block will become resistant to storage.
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