Because nitrogen drives vegetative growth, and that becomes unwanted once a crop moves from leaf production into flowering and fruiting. MKP supplies high phosphorus and high potassium with no nitrogen at all, so a grower can support flower initiation and fruit fill without provoking further leaf growth that would compete for resources and shade the crop.
2
What is the analysis of MKP?
0-52-34, meaning no nitrogen, 52 percent phosphorus as P2O5 and 34 percent potassium as K2O. It also contains no chloride and no sodium, which matters for chloride-sensitive crops and for recirculating hydroponic systems where both accumulate.
3
Does MKP help with alkaline irrigation water?
Yes. Its solution is mildly acidic at around pH 4.5, which counteracts alkaline irrigation water locally and helps keep phosphorus in solution rather than precipitating as insoluble calcium phosphate in the tank or the dripline. That is a practical advantage in hard-water regions where scaling of emitters is a recurring problem.
4
Can MKP be used as a buffer?
Yes. Paired with the alkaline DKP it forms the potassium phosphate buffer system, widely used in fermentation, in isotonic and protein beverages and in biological media. The ratio between the two salts sets the working pH, and the total concentration sets how much acid or alkali the buffer can absorb.
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