Diagnosis and Fertilization of Potato Nitrogen, Phosphorus and Potassium Fertilizers

Nitrogen fertilizer

Excessive application of nitrogen fertilizer in potato will result in long stems and leaves, small and small potato, and poor taste; if the nitrogen fertilizer is scarce, the plant grows thin, short, yellow and yellow, and the leaves of the base are prematurely withered and the yield is reduced. The nitrogen deficiency of the potato is carried out by using 5-8 kg of urea with water, and the nitrogen nutrition is added immediately.

2. Phosphate fertilizer

Although the demand for phosphate fertilizer in potato is small, the effect of phosphate fertilizer on plant growth and yield increase is significant. Increasing the application of phosphorus fertilizer can increase the utilization of nitrogen fertilizer by the plant, promote the accumulation of dry matter and starch in the stem, increase the storability of the stem, and increase the application of phosphate fertilizer to promote root growth and improve the cold resistance and drought resistance of the plant; the phosphate fertilizer is insufficient and the plant grows slowly. Short erect, the leaves become smaller, the leaves are dark green, the photosynthetic strength is low, the yield is decreased, and rust spots are generated in the tubers. It can be sprayed with 0.3% to 0.5% potassium dihydrogen phosphate solution every 8 to 15 days, continuously. 2 to 3 times.

3. Potash

The application of potassium fertilizer is beneficial to enhance the photosynthesis of plants, promote the synthesis of carbohydrates, proteins, fats and cellulose, so that the plants can grow vigorously, and the effects of enhancing plant resistance to lodging, cold and disease are significant. When potassium is insufficient, The plant growth is inhibited, the internodes become shorter, the stems are dwarfed, the plants are densely clustered, the leaves are shrunk, the leaves are dark green, the later leaves are bronzed, the leaves are dead and curled, the stolons are shortened, the roots are thin, the tubers become smaller, and the potatoes are It is gray, can be sprayed with potassium dihydrogen phosphate, and can also be sprayed with 0.02% ~ 0.1% potassium sulfate to reduce or eliminate the symptoms of potassium deficiency.
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