Potato fertilizer requirement
During the entire period of growth of the potato, due to the different stages of the fertility, the types and quantities of nutrients it needs are also different. The seedling stage absorbed little fertilizer, and the hair growth period suddenly rose. The initial stage of tuberculosis could not reach the peak of total fertilizer absorption, and then it dropped abruptly and showed a unimodal curve.
The three elements of nitrogen, phosphorus, and potassium were absorbed at each stage of growth, and they were 6%, 8%, and 9% from the germination to the emergence stage, respectively, according to the percentage of total absorbed fertilizer; the period of hair growth was 33%, 34%, and 36 respectively. %; Tuber period was 56%, 58% and 55%, respectively.
Among the three factors, potato absorbs the most potassium, followed by the least nitrogen and phosphorus. In the plant growth, the amount of phosphorus absorbed basically remains balanced.
The absorption of nitrogen, phosphorus, and potassium in organs such as roots, stems, leaves, and tubers, the general trend is to change with the requirements for changes in the growth of organs. For example, the uptake of nitrogen by roots, stems, and leaves is reduced during the period of potato, followed by the transfer of nutrients to the tuber and the gradual ageing of these organs. However, the tubers maintain a balanced absorption condition. Phosphorus uptake by stems is high during the period of potato growth. There is a peak that is obviously related to the energy consumption of organic matter in the process of tuber handling.
Magnesium is the core element of chlorophyll, and it is also one of the components of the enzyme, so the absorption changes with the growth of the leaf, and the tuber absorbs the least amount of magnesium and does not change much. Calcium is a gluing substance of cells, so it absorbs most during the hair growth stage, and the cells of the tuber are always in a state of fragmentation, proliferation, and continued enlargement, so the amount of calcium required tends to be stable.
In the late-stage and vigorous-junction transition period, trace elements copper and boron have a special effect on the net photosynthetic productivity of advanced plants. Copper is included as an oxidase component, which can enhance the respiration effect, increase the protein content, and retard the leaves. Become old, enhance drought resistance and so on. Spraying copper or boron mixture at the flowering period has the effect of increasing production.
If the plant lacks certain elements or trace elements during the growth period, it will show some specific symptoms. It is necessary to make up for the nutrient in time according to the different symptoms of the plant so as not to reduce the production.
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