Phosphorus chemicals

  • Potassium phosphite
Potassium phosphite

Potassium phosphite

  • CAS: 13492-26-7
  • MF: K2HPO3
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The phosphorus in the molecular formula of potassium phosphite is +3-valent phosphorus, and potassium dihydrogen phosphate are two completely different fertilizers, They are very similar in appearance, water solubility, and have partially the same agricultural uses. The CAS No of potassium phosphite is 13492-26-7 which is one of the main raw materials for the production of bactericidal nitrogen, phosphorus and potassium complex fertilizers, which can be mixed with nitrogen, phosphorus, potassium, sodium humate, sodium alginate, amino acids and other fertilizers, of which 0-530-340 is one of the fertilizer nutrient specifications after adding water. The mixture of potassium phosphite with copper, calcium, zinc, magnesium, boron, iron and other trace elements requires the addition of ion stabilizer or other chelating agents to prevent precipitation or flocculation in the process of compounding.


Basic information:

English name:Potassium phosphite;Dipotassium phosphite;Dipotassium hydrogen phosphite

CAS NO.:13492-26-7

Chemical formula:K2HPO3

H.S NO.:2835100000


Product Indicators:





P2O5(Converted to P2O3)








Heavy metal(Pb-based)


Water insolubles content



1. After the + 3-valent phosphorus of potassium phosphite is absorbed by crops, a series of electrochemical reactions such as REDOX and charge transfer occur, disrupting the normal physiological activities of pathogens, so as to kill or inhibit the damage of pathogens to crops.

2. After potassium phosphite is absorbed by crops, it can initiate the active defense system of crops against pathogens, improve the immune ability of crops against bacteria, fungi, viruses, etc., and inhibit the reproduction and growth of pathogenic cells, eggs, mycelia, etc.

3, It is reported that after a series of complex oxidation and biochemical reactions in the crop body, potassium phosphite can improve the contents of plant protection hormone, chitinase, polyphenol oxidase, peroxidase, glucanase, etc. of crops to a certain extent, promote the absorption of nutrients by crops, and play the effect of healthy crops.

4, Potassium phosphite may guide the cells of crops to produce lignin, increasing the thickness of the cell wall. The thickness of cell wall plays the first protective effect on the defense of pathogenic bacteria, and the increase of cell wall thickness may inhibit the fungal and viral diseases such as downy mildew, powdery mildew, black star disease, late blight, phytophthora infestation, blight, root rot disease, etc., thus improving the resistance of crops to disease.



1, It can be combined with amino acids, humic acid, seaweed organic fertilizer and calcium, boron, zinc, magnesium, iron, copper, molybdenum and other trace element fertilizer in accordance with scientific formula to form liquid water-soluble fertilizer, play a multiple fertilizer effect.

2, It has a certain auxiliary effect on some diseases, such as citrus canker disease and yellow dragon disease. It has an inhibitory effect on some fungal and bacterial diseases, and the synergistic effect is obvious after combining with synergistic additives, which can reduce the use of pesticides.

3. After the absorption of potassium phosphite, the guiding mechanism of crops can enhance immunity, promote root growth, promote photosynthesis of some crops, and increase the conversion rate of sugar and starch.

4, It can be used with a variety of crops, including vegetables, leafy vegetables, cucumbers, melons, watermelon, garlic, Onions, ginger, potatoes, red beans, peas, spinach, lettuce, cabbage, citrus, apples, pears, cherries, grapes, strawberries, peppers, tomatoes, chrysanthemum and so on.



1, Potassium phosphite avoid use with strong acidic, strong alkaline, strong oxidizing chemicals or fertilizers, otherwise it will lead to failure.

2, Potassium phosphite is easy to react with metal trace element fertilizer, and it is necessary to add additives or ion stability maintainers when mixing.

3, The single use of potassium phosphite should not be too much, generally speaking, spray dilution 1000-1500 times, punching application amount of 1-2Kg/ mu.

4, Avoid high temperature, drought, flowering period, young fruit period, tender use.


The bactericidal and controlling effect of potassium phosphite is closely related to the purity, quality, compound formula, use method, use time and other factors. The safety of potassium phosphite is closely related to the use of concentration, methods and other factors, in general, as long as the prescribed dosage is not exceeded, the scientific and reasonable use of the compound is safe, and after degradation, it becomes a potassium phosphate fertilizer, which also promotes the absorption of phosphorus and potassium in crops.

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