Potassium deficiency: Lack of potassium causes the lower leaves of the main stem to turn yellow, the edges to become withered and dry, and even to wither. However, the dead leaves still adhere to the main stem and do not fall off for a short period of time. In addition to the leaves at the bud eyes, all other leaves will be affected. Excessive potassium can lead to magnesium deficiency or salt poisoning, affecting the production of new cells, causing the bud eyes of the main stem to grow incompletely, and the leaves near the new buds and the leaf edges to wither.

Sufficient potassium can promote the speed of plant photosynthesis, and promote the absorption of trace elements such as nitrate by the main stem. Potassium fertilizer contains a lot in ash. However, most of the potassium fertilizer needed at home comes from chemical fertilizers, such as potassium dihydrogen phosphate, ammonium sulfate, and potassium chloride, etc.

1. Long-term application or application on soil with a high calcium content can easily lead to soil degradation and alkalinization. In addition, ammonium sulfate cannot be used in aquatic crops, such as rice. When too much ammonium sulfate is used in rice, it can easily cause hydrogen sulfide poisoning.

2. Long-term application does not easily alkalinize the soil, and is often used in crops such as tobacco, fruits and vegetables, and fruits. During the growth period when crops require a large amount of nitrogen, potassium nitrate can be used. In addition, potassium nitrate can also be used during the normal growth period and fruit expansion period of crops.

According to the geological conditions of the soil layer, the potassium content, and the characteristics of different crops, select the most suitable type of potassium fertilizer. In addition, the effective potassium content in the soil layer directly determines the effectiveness of potassium fertilizer application. When the effective potassium content in the soil is too high, it will fix potassium in the soil, reducing fertility, while a lower effective potassium content is more conducive to the full exertion of potassium fertilizer effectiveness.

For soil plots where the effective potassium content in each kilogram of soil is less than 40mg, it is a severe potassium-deficient plot. Potassium fertilizer of 15-20kg per mu can be applied to carry out potassium supplementation. For plots where the effective potassium content is less than 80mg, potassium supplementation has a significant high yield effect, and plots where the effective potassium content is between 80-120mg generally do not need potassium supplementation.

For soil layers with poor water-solubility and sandy soil, although potassium application is more effective compared to heavy clay soil layers, due to its easy leakage, potassium content is relatively low. Therefore, it is recommended to increase the amount of potassium fertilizer applied, while heavy clay soil layers generally have a higher content of effective potassium, and can use less potassium fertilizer.

Expansion materials

After crops are deficient in potassium, the following main manifestations generally occur:

The straw of blood pressure becomes loose and easy to fall, with fewer and poorer quality spikes;

The lower leaves of the main stem turn yellow first and then brown, with the leaf edges showing a charred and withered appearance; when potassium deficiency is slight, the leaves will appear yellow-brown spots, but the petioles and the middle of the leaves are still green. When potassium deficiency is severe, all the leaves will turn brown-red or wither and fall off;

After supplementing crops with potassium deficiency, the roots and stems become shorter and fewer, and the main stem is very prone to aging;

Lack of potassium can also lead to inconsistent ripening of fruits, along with shrinkage in size, decline in taste, and reduction in quality.