Monopotassium Phosphate (MKP) Fertilizer 0-52-34, Water-Soluble

Greenway Biotech Monopotassium Phosphate (MKP) 0-52-34 is a single water-soluble salt, potassium dihydrogen phosphate (KH₂PO₄). It guarantees 52% available phosphate (P₂O₅) and 34% soluble potash (K₂O) and contains no nitrogen.

Gardeners use it for tomatoes, vegetables, and fruit trees where a soil test shows low phosphorus, weighed and mixed into the soil, and as a leaf spray: 38 g in a gallon of water makes a 1% spray for young vegetable leaves. Hydroponic and fertigation growers use it as the phosphorus source in published university recipes. Keep its concentrate apart from calcium concentrates such as calcium nitrate, because calcium and phosphate form insoluble precipitates, and keep calcium and magnesium fertilizers out of the spray tank.

The product page gives amounts per plant, per tree, and per gallon, with a calculator. It adds no nitrogen and is not a complete fertilizer. Registered with CDFA. Packed in Madera, California, in 1 to 50 lb bags.