See the situation

In the branching and potato stage, underground root nets are formed, and the potato chunks begin to expand, and the suction fertility is strong. To increase the leaf area and increase the photosynthetic production efficiency, it is necessary to top-dress fertilizers early to achieve the purpose of promoting the growth of strong plants and rapid growth. Better growth can reduce fertilizer use. If the amount of nitrogen applied to raise the seedlings or clumps of trees is larger, only the potash fertilizer can be applied to the potato fertilizers, and about 10 kg of potassium sulfate can be applied to the mu.

See time

Potato fertilizer is generally applied about 45 days after planting. At this time, the part of the ground has been dumped under the ridge, and the tuber has been basically shaped. On one side of the ridge, the plough is used to break open 1/3 and then fertilize. Breaking the ridges and fertilizing can improve the ventilation condition of the soil, which is conducive to the expansion of the tubers. The fertilization is mainly potassium fertilizer. Topdressing potassium fertilizer can increase stems and petioles to keep them young and promote tuber enlargement.

Look at moisture

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 long. 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.

See soil quality

Sandy soil, good ventilation, but poor fertilizer and water retention, fertilizer efficiency is not lasting, and easy to lose, to increase the application of organic fertilizer to improve the soil, the application of quick-acting fertilizer to a small amount, 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.

Note that 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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