DiPotassium+Phosphate

The pH of a dipotassium phosphate solution is almost neutral. It is formed by the stoichiometric neutralization of [|phosphoric acid] with [|potassium hydroxide] : H3PO4 + 2 KOH → K2HPO4 + 2 H2O
 * Dipotassium phosphate** (K2HPO4) - also phosphoric acid, dipotassium salt; dipotassium hydrogen orthophosphate; potassium phosphate, dibasic - is a highly water-soluble salt which is often used as a fertilizer, food additive and buffering agent . It is a common source of phosphorus and potassium.

Fertilizer
This active ingredient is commonly sprayed on leaves as a fertilizer, and seems also to help control certain fungal diseases on ornamentals. When used in association with another fertilizer, dipotassium phosphate is approved for use in the manufacturing of pesticide products intended to control certain fungal diseases. When label directions are followed, this active ingredient is not expected to harm people or the environment. The active ingredient in dipotassium phosphate seems to have a mixed mode of action involving direct toxicity to the pathogen aided by a boosting of the plants defense mechanisms due to the fertilizing properties of the compound.