Water-Soluble Fertilizer
Monopotassium Phosphate (MKP)
Mono-Potassium Phosphate · KH₂PO₄ · 0-52-34
52% P₂O₅ + 34% K₂O
Monopotassium phosphate (MKP) is a fully water-soluble fertilizer supplying 52% phosphate (P₂O₅) and 34% potassium (K₂O) in a single chloride-free crystal. Its low salt index and high purity make it the standard phosphorus–potassium source for fertigation and foliar feeding on high-value crops. Cerantis supplies greenhouse- and fertigation-grade MKP to European distributors, blenders and specialty growers.
Product Specifications
Grade (N-P-K)
0-52-34
Phosphate (P₂O₅)
52% (min.)
Potassium (K₂O)
34% (min.)
Water Solubility
100% – fully soluble
Chloride Content
≤ 1% (chloride-free)
Solution pH
4.3–4.7 (slightly acidic)
Packaging
25 kg bags, 1 MT big bags
Lot Sizes
1–25 MT
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Applications
- Fertigation through drip and sprinkler systems on vegetables, fruit and vines
- Foliar feeding during flowering and fruit development (high P + K demand)
- Nutrient solutions for greenhouse and hydroponic production
- Chloride-sensitive crops such as berries, potatoes, vines and citrus
- Base component for water-soluble NPK and PK blends
- Starter applications where a low-salt phosphate source is required
Frequently Asked Questions
What is monopotassium phosphate (MKP)?
Monopotassium phosphate (MKP) is a fully water-soluble fertilizer with the formula KH₂PO₄, supplying 52% phosphate (P₂O₅) and 34% potassium (K₂O). It is chloride-free and has a low salt index, which makes it a premium phosphorus and potassium source for fertigation and foliar feeding. Growers use it mainly on high-value crops such as greenhouse vegetables, berries and vines.
What is the NPK grade of MKP?
MKP has an NPK grade of 0-52-34: zero nitrogen, 52% phosphate (P₂O₅) and 34% potassium (K₂O). Because it carries no nitrogen, growers can dose phosphorus and potassium independently of their nitrogen programme, which is useful during flowering and fruit set when nitrogen needs to be held back.
Is MKP chloride-free, and why does it matter?
Yes. MKP contains essentially no chloride (≤ 1%), unlike potassium chloride (MOP). Chloride can damage salt-sensitive crops such as strawberries, potatoes, tobacco, citrus and grapevines, and it raises the salt index of the nutrient solution. A chloride-free source like MKP supplies potassium without that risk.
MKP vs. MAP – which phosphate fertilizer should I choose?
MAP (monoammonium phosphate, 12-61-0) supplies phosphate with nitrogen and reacts acidic. MKP (0-52-34) supplies phosphate with potassium instead of nitrogen and has a milder, slightly acidic reaction. Choose MKP when you need potassium alongside phosphate, want to avoid extra nitrogen, or work with chloride-sensitive crops; choose MAP when an early nitrogen boost is the priority.
What crops and growing systems use MKP?
MKP is used mainly in fertigation and foliar programmes for high-value crops: greenhouse tomatoes, peppers and cucumbers, soft fruit and berries, table and wine grapes, citrus, and potatoes. It also suits hydroponic nutrient solutions and any system where a fast-dissolving, chloride-free phosphorus–potassium source is needed.
What does water-soluble MKP cost?
MKP prices depend on phosphate and potash feedstock costs, grade (greenhouse vs. technical) and order volume. As a specialty water-soluble product it trades well above bulk fertilizers such as MOP or DAP. Contact Cerantis with your grade, packaging and quantity for a current quotation.
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