Understanding this fertilizer's price and make-up is vital for Kenyan agriculturalists . Currently, this type of fertilizer sells for anywhere from around 3,500 KES to Ksh 4,500 per unit, based on the vendor and area . Typically , the standard phosphate make-up contains 18% ammonia, 52% P2O5 , and 0% potash , although modified blends may be found r