Monopotassium Phosphate MKP
Potassium Dihydrogen Phosphate; Potassium Dihydrogenorthophosphate; Monopotassium Ortophosphate; MKP; E340
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What is Monopotassium Phosphate (MKP)?
Monopotassium phosphate (MKP), also known as potassium dihydrogen phosphate, is a highly pure, two-component chemical compound that serves as an excellent source of readily available phosphorus (P) and potassium (K) in horticulture and agriculture. Supplied as a fine crystalline powder, this premium-grade raw material is fully water-soluble, ensuring efficient, precise nutrient delivery and contributing directly to crop yield and quality. Thanks to the absence of nitrogen, chlorides, and heavy metals, monopotassium phosphate is ideal for safe, controlled plant nutrition – both in open-field cultivation and under cover.


Physicochemical properties
Monopotassium phosphate stands out for its complete water solubility, making it an ideal choice for fertigation as well as for demanding foliar feeding applications. It also has a moderately low pH and contains no sodium, chloride, or other harmful elements. This high level of purity allows for safe use even in the most sensitive crops, including hydroponic systems.
How Does Monopotassium Phosphate Work?
Monopotassium phosphate (MKP) has a broad-spectrum effect in agriculture and horticulture – it stimulates root development, supports flowering, and enhances fruit setting and ripening.
Additionally, potassium dihydrogen phosphate effectively promotes the growth of young plants, boosts their resistance to stress, and improves the uptake of essential nutrients.
Monopotassium phosphate contains, among other elements, potassium – an essential nutrient responsible for regulating the plant’s water balance. It significantly boosts the plant’s resistance to drought and other environmental stress factors.
Monopotassium Phosphate in the Fertilizer Industry
Monopotassium phosphate plays a key role in modern plant nutrition, especially where precise nutrient delivery is essential and the risk of soil salinity must be minimized. Thanks to its exceptional purity and complete water solubility, it is widely used in fertigation and foliar feeding – across large-scale agriculture, professional horticulture, and fruit cultivation.
Potassium dihydrogen phosphate is also an excellent choice during periods when nitrogen supply needs to be limited—such as during flowering or fruit ripening. It is safe and highly versatile, allowing for flexible fertilization strategies tailored to the plant’s current needs. It improves the quality and quantity of yields while minimizing the risk of nutrient loss.
Monopotassium Phosphate in Horticulture
Monopotassium phosphate has earned particular recognition in both professional and home gardening – primarily thanks to its purity, excellent solubility, and absence of harmful elements such as sodium or chloride. As a result, potassium dihydrogen phosphate is highly effective for fertilizing sensitive plants grown both in open fields and under cover. Importantly for growers, it can be safely used in vegetable crops (such as tomatoes, cucumbers, peppers, onions, and lettuce), fruit trees (including apples, cherries, plums, sour cherries, and peaches), as well as a wide variety of ornamental plants.
In greenhouse horticulture and hydroponic systems, monopotassium phosphate is primarily used as a reliable source of phosphorus and potassium during critical stages of plant development—such as bud formation, flowering, and fruit setting. A high-quality monopotassium phosphate supports efficient nutrient management, whether applied through fertigation or foliar feeding. In addition, thanks to its low salt index and slightly acidic solution, it effectively enhances the uptake of other micronutrients.


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