While N is expressed on an real elemental basis, P and K are expressed on an oxide basis (that is certainly, they’re contained during the phosphate and potash compounds).??? ???? ??????? ??? ??????? ??? ??????? ??? ????? ????? ?????? ????????? ???????? ??? ???? ????? ????? ?????? ?? ??????? ?????? ??? ??? ????? ????? ?????? ???? ???? ???? ????? ?