Potassium can adjust the colloidal state of cell protoplasts, increase the intensity of photosynthesis, and promote the formation of starch and sugar in crops. It has the effects of improving cold tolerance, drought tolerance, disease resistance and lodging resistance for certain crops, fruits and vegetables. Appropriate supply of potassium fertilizer can also promote the absorption and utilization of nitrogen and phosphorus by crops, and increase crop yield and fruit setting rate.

When crops and fruit trees are lacking in potassium, they will manifest as physiological exhaustion. Within two or three days, the leaves of the plants will rapidly turn yellow or red, and then wither and fall off. The stems die, commonly known as red leaf stem blight. Therefore, before crops, vegetables and fruit trees are seriously lacking in potassium, effective potassium must be supplemented, and foliar spraying of potassium is the most economical and effective way to supplement potassium.

Potassium fertilizers currently used in the market are generally potassium sulfate, potassium nitrate, potassium chloride and their compound fertilizers. What kind of foliar spraying potassium fertilizer to choose is nothing more than the following criteria:

(1) High potassium content

(2) The solubility should be large

(3) It is easy to absorb and safe and harmless.

In order to be clear, we can compare several foliar potassium fertilizers currently commonly used as follows (among them, potassium chloride contains extremely high harmful substance chloride ions, which is basically out of consideration