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Symptoms of NPK - Potassium 

Nitrogen is the component of chlorophyll, chlorophyll a and chlorophyll b are nitrogen compounds.


Phosphorus content in plant body is second to nitrogen and potassium, and it is generally higher in seeds.


Potassium is the main nutrient element of plants, and it is also one of the three factors that often affect crop yield due to insufficient supply in soil.

(二) Potassium


Principle 1 : Potassium is the main nutrient element of plants, and it is also one of the three factors that often affect crop yield due to insufficient supply in soil. The potassium content of crops is similar to that of nitrogen, but higher than that of phosphorus. In many high yield crops, potassium content is higher than nitrogen content. Potassium is different from nitrogen and phosphorus, and it is not an organic compound in plants. So far, no potassium containing organic compounds have been found in plants. Potassium is dissolved in plant juice in ion state, and its main function is related to metabolism of plants.

Principle 2 : Potassium can promote photosynthesis, and potassium deficiency weakens photosynthesis. Potassium can obviously improve the absorption and utilization of nitrogen by plants and quickly convert it into protein. Potassium also promotes plant economic water use. Because potassium can accumulate in crop cells more, it increases the osmotic pressure of the cells and moves water from the low concentration of soil solution to the high concentration of root cells. When the potassium supply is sufficient, the crops can effectively use water and keep it in the body, reducing the transpiration of water.

Principle 3 : Another characteristic of potassium is that it helps crops to resist stress. One of the important physiological functions of potassium is to enhance the regulation of cells on environmental conditions. Potassium can enhance the tolerance of plants to various adverse conditions, such as drought, low temperature, salt content, disease and insect pests, lodging, etc.

Principle 4 : The most common potassium deficiency symptom of plants is burning along the leaf edge. First, it starts from the old leaves at the lower part, and gradually expands to the upper leaves, and has spots. The growth of K deficient plants is slow and the root system is poor. The stem and stem are fragile and often fall back. The seeds and fruits are small and dry. The resistance of plants to diseases was low. It has obvious lodging resistance, which can increase the taste of fruits and vegetables.