1. Look at the seedlings: In the branching and potato phase, the underground root net is formed, the potato block begins to expand, and the fertilizer is strong. In order to increase the leaf area and improve the photosynthetic production efficiency, it is necessary to topdress early to achieve strong potato and quick potato. Long and stable purpose. For better growth, the amount of fertilizer can be reduced. If the amount of nitrogen applied to the seedlings or the group is higher, the potato fertilizer can only be applied with potassium fertilizer, and about 10 kg of potassium sulfate can be applied per mu.
2. Look at the time: the potato fertilizer is generally applied about 45 days after planting. At this time, the above part of the ground has been ridged, and the potato block has been basically shaped. On the side of the ridge, the plough is broken by 1/3, and then fertilized. . Broken ridge fertilization can improve the ventilation of the soil and is conducive to the expansion of the potato tubers. The fertilization is mainly based on potash, and the application of potassium fertilizer can make the stem and petiole thicker, keep it young and promote the expansion of potato tubers.
3. Look at 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 arid regions from July to August, nitrogen fertilizer should be applied before the drought to promote the sealing of the stems and leaves before the drought. In the years with more autumn rain, the number and frequency of top dressings may be appropriately reduced, and vice versa.
4. Look at the soil: 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, the application of quick-acting fertilizer should be a small amount, appropriate increase in the number of top dressing. In clay soil, due to poor gas permeability, fertilizer decomposition is slow, but the fertility is strong, so the amount of topdressing should not be too small, and the amount can be chased more appropriately, and the number of topdressing is appropriately reduced.
5. Sweet potato cannot be applied with fertilizer containing chlorine. When a chlorinated fertilizer such as ammonium chloride or potassium chloride is applied in excess of a certain amount, not only the starch content of the potato pieces is lowered, but also the potato pieces become unreliable for storage.
2. Look at the time: the potato fertilizer is generally applied about 45 days after planting. At this time, the above part of the ground has been ridged, and the potato block has been basically shaped. On the side of the ridge, the plough is broken by 1/3, and then fertilized. . Broken ridge fertilization can improve the ventilation of the soil and is conducive to the expansion of the potato tubers. The fertilization is mainly based on potash, and the application of potassium fertilizer can make the stem and petiole thicker, keep it young and promote the expansion of potato tubers.
3. Look at 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 arid regions from July to August, nitrogen fertilizer should be applied before the drought to promote the sealing of the stems and leaves before the drought. In the years with more autumn rain, the number and frequency of top dressings may be appropriately reduced, and vice versa.
4. Look at the soil: 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, the application of quick-acting fertilizer should be a small amount, appropriate increase in the number of top dressing. In clay soil, due to poor gas permeability, fertilizer decomposition is slow, but the fertility is strong, so the amount of topdressing should not be too small, and the amount can be chased more appropriately, and the number of topdressing is appropriately reduced.
5. Sweet potato cannot be applied with fertilizer containing chlorine. When a chlorinated fertilizer such as ammonium chloride or potassium chloride is applied in excess of a certain amount, not only the starch content of the potato pieces is lowered, but also the potato pieces become unreliable for storage.
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