The most nutrients in the potato are potassium, nitrogen and phosphorus, followed by a small amount of iron, boron, zinc, manganese, copper, molybdenum and sodium.
The demand for nitrogen, phosphorus and potassium was different in each growth period, and the seedling period was very small, accounting for 19%, 17.5% and 17% of the total.
The demand for hair growth increased sharply, accounting for 56%, 48.5%, and 49% of the total, respectively, mainly distributing stems and leaves, accounting for 67%, followed by tuber accounting for 33%.
The demand for potato production accounted for 25%, 34%, and 34% of the total, respectively, with tuber-based, accounting for 72%, while stems and leaves accounted for 28%. The absorption of calcium, magnesium and sulfur has little seedling period, the absorption rate is also slow, and the growth period is steeply increased until it slows down after the potato phase. The potato absorbs trace elements very little, the tuber yield is 1340 kg/mu, and the absorbed copper is 2.9 g, manganese 2.8 g, molybdenum 0.05 g, and zinc 6.6 g.
Most of the nitrogen, phosphorus and potassium required by potatoes are supplied by the soil, and most of them need to be supplemented by base fertilizer and top dressing. In general, for every 1000 kilograms of tubers produced, 4-6 kilograms of pure nitrogen, 1.66 to 1.85 kilograms of phosphorus pentoxide, and 8 to 10 kilograms of potassium oxide are absorbed from the soil.
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