Fertilizers containing ammoniacal N or urea really should be watered in to forestall N decline for the ambiance. The sources of P are potassium phosphate and urea phosphate. Potassium is usually listed as potash (K2O) on the fertilizer label, as found On this example. The sources of K2O are potassium https://enkelundagro.com/product-category/water-soluble-fertilizer/