The growth and development of crops are indispensable for the three nutrients such as nitrogen, phosphorus and potassium. Farmers usually fertilize crops with fertilizers based on these three nutrients. However, some farmers have applied a large amount of nitrogen fertilizer and phosphate fertilizer, but they have neglected the application of potassium fertilizer. What are the symptoms of lack of potassium fertilizer in crops? How should farmers remediate?
First, the role of potassium in crops
Potassium is a very active element in plants that is usually distributed in the form of salt before being absorbed by plants:
1. Potassium can help plants absorb other nutrients (including water and oxygen) and promote plant growth.
2. Potassium fertilizer can enhance the resistance of crops, making crops more resistant to cold, frost, salt and pests. Tests have shown that increasing the application of appropriate amount of potassium fertilizer can effectively reduce the leaf spot, rice blast, and sheath blight of rice, powdery mildew of wheat, scab and rust of wheat.
3. Potassium can promote the photosynthesis of crops, improve the quality of fruits, and increase the sugar content, vitamin C content and color of fruits.
4. Potassium in legumes can enhance its own nitrogen fixation. Just like the proper intake of potassium-containing foods can make muscle tissue stronger.
Second, the performance of crops lacking potassium
(1) There is a similarity between the lack of nitrogen and phosphorus. The symptoms of potassium deficiency first appear as old leaves, and then the leaves will be micro-volume and yellow. If they continue, they will develop to the base of the plant, and then the plant will resist The weakened ability leads to vulnerability to disease, easy lodging, and cold and drought resistance;
(2) Fruits such as melons, fruits, and tomatoes are poorly colored and their quality is degraded. If humans eat potassium-deficient foods for a long time, then the human body may also be deficient in potassium. Because the body itself cannot produce potassium, potassium deficiency is mainly manifested as: heartbeat acceleration. Muscle weakness, nausea, vomiting, low Blood Pressure , cold heart and even confusion.
Third, the method of supplementing potassium for crops
Therefore, the growth and development of crops are inseparable from potash, so how to remedy the shortage of potassium crops?
(1) Potassium Fertilizer: There are many kinds of potash fertilizers on the market, but they should not be applied blindly, so that excessive potassium fertilizer is also easy to cause pests and diseases. Under normal circumstances, potassium fertilizer is used in the case of base fertilizer, top dressing, foliar spray or soilless cultivation. The fruit is swollen, applied or foliar sprayed in the early stage of fruit expansion. 0, 5% potassium dihydrogen phosphate, potassium nitrate, sulfuric acid Potassium and potassium chloride solution can be used.
(2) Human and animal organic fertilizer: Human and animal organic fertilizer mainly includes livestock manure, poultry manure, human excrement, etc., of which the proportion of manure in rural areas is relatively large. Since the potassium in the manure is almost entirely in a form that can be dissolved, the effectiveness of potassium in the manure is similar to the application of potassium fertilizer and the fertilizer efficiency is quite high.
(3) Straw returning: The straw in crops is not only rich in nitrogen and phosphorus but also rich in potassium. Straw returning has an excellent effect in supplementing soil with potassium deficiency. However, at present, a large amount of straw in China is directly burned as fuelwood, and most of the remaining straw ash is used in vegetable fields. The potassium that has been burned off the straw has been used a lot, and it is used in other places. There are fewer opportunities for soil to Supplement potassium. Therefore, the straw of the crop can be treated by other methods to supplement the missing potash in the land.
Nitrogen, phosphorus and potassium are the three major elements that promote the growth of crops. Farmers must apply rain and dew when fertilizing crops. Only in this way can crops grow healthily.
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