Dipotassium Hydrogen Phosphate (DKP) — Frequently Asked Questions

To avoid sodium. In recirculating hydroponic and fertigation systems sodium accumulates and becomes toxic to plants, since it is not taken up in the quantities it is applied. In fermentation media sodium loading has to be controlled for the same reason. The potassium salt does the identical chemical job while supplying a nutrient rather than a contaminant.

Potassium phosphates are strongly deliquescent, meaning they absorb enough atmospheric moisture to dissolve in it. Bags left open will cake and eventually liquefy, and the material loses assay as it takes up water. It should be stored sealed in a dry area and part-used packaging resealed immediately.

As a nutrient salt and a buffer at the same time. It supplies potassium and phosphorus, both required in quantity for microbial growth, and its alkaline reaction pairs with the acidic MKP to hold the medium at a chosen pH as the fermentation generates acid. That dual role is why the potassium phosphate pair is standard in fermentation media.

Around 9, mildly alkaline. That makes it the base component of a potassium phosphate buffer system, paired with the acidic MKP at pH 4.5. Blending the two in different ratios sets the working pH anywhere between those points, which is how biological and process systems are held stable.