Sweet potato is a potassium-promoting crop. The relevant data shows that: 1,000 kilograms of fresh potatoes contain 5.5 kg of potassium oxide, 3.5 kg of pure nitrogen, and 1.75 kg of phosphorus pentoxide, and the ratio of the three is 3:2:1. Potassium can prolong the leaf age, promote the photosynthetic product to the potato block, reduce the concentration of photosynthate in the leaf, and increase the photosynthetic capacity of the leaf; Potassium can promote the formation activity of the potato block, increase the number of cells, and accelerate the enlargement of the tuber; Potassium can improve the quality of the tuber Improving disease resistance and drought resistance, and enhancing storage stability; In the case of prosperous growth of stems and leaves, potassium fertilizer can inhibit the growth of the underground and promote the expansion of potato wedges. The potassium content in the leaves is less than 0.5%, which means that potassium deficiency symptoms are present. Sweet potato lacks potassium in its early growth period, with small leaves, short nodes, and short petioles. Leaves near the growing point are slightly white, and the leaves are uneven. In the late period of potassium deficiency, the growth of stems and leaves was slow, and the chlorophyll was absent between the veins of the old leaves. In severe cases, the leaves turned yellow and died. Because potassium is easily transferred in the body, potassium in the old leaves can be transferred to the new leaves when potassium deficiency occurs, so potassium deficiency generally starts from the old leaves first. Potassium deficiency in the soil mainly affects the activity of enzymes, which in turn influences the metabolism of carbohydrates, such as synthesis, decomposition, and operation, and reduces the yield and quality of sweet potatoes.
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