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???? ??????? ?????? ????????? ?????? ????? ????? ?? ????? ??? ???????? ????? ?????? ????????????? ??????? ??? ????? ???????? ???????? ???????? ??????? ?? ??????? ??????????? ???? Anglo American Crop Nutrients. ????? ???????? ???? ??? ????? ???? ???????? ??? ??????? ????????? ?????? ?????? ???????? ???????? ???????? ???????.

??? ??? ??????? ??????? ?????? ???? ?????? ??????? ??? ??? ?? ????? ???? ????? ???????. ?????? ?????? ???? ???? ???? 260 ????? ??? ??? ?????? ????? ??? ?????????? ???????? ??????????? ??????????. ?????? ??????? ?? ????? ??????? ??????? ???????? ???? ?? ????? ??????? ??????? ?? ??? ???????? ?? ???? ????? ??????? ?????? ???? ??????. (???? ??? ?????? ??????: ??? ??????? ???? ?????? ?????? ?????? ???????)

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???? ??????? ??? ???? ??????? ?? ??????? ??????? ??? ?????? ?? ???? ??????? ?????? ????? ?? ???????? ???????? ?????? ????? ??????? ???????? ??????? ?? ?????? ????? ?????? ?????????. ????? ??????? ??????? ???? ?? ?????? ???????? ??? ????? ????? ??????? ??? ????? ????????? ??????? ?????? ??????? ??????? ?? ???????. ??? ???? ???? ??????????-15? ??? ???? ????? ??????????? ??? ??????? ???500 ?? ????? ??????? ??????? ?? ????????????? 50 ?????? ?????? ?? ???? ?????? ??????? ?????? ??????? ????? ??????? ??????? ???????. ??????? ?? ????? ????? ????????? ????????? ?? ???? ?????? ?????????? ?? ?????? ????? (N₂) ???????? (C) ?????? ?? ?????? ???????? ????????? ??? ?????? ??? ????? ??????? ???????.

??????? ????? ???? ?? ?????? ??????? ??? ?????? ?? ?????? ????????. ??? ??? 1978? ????? ??????? ??? ??? ??????? ?????? ?????? ?????? ???????? ?????? ???????? ????????? ??? ?????? ??? ????????? ?????? ??????? ?? ??????? ??? ????? ?????? ?????.

????? ??????? ???? ??????? ??? ?????? ?????? ??????? ??? ?????? ??????? ???????? ??????? ?????? ?????? ????? ???????? ??? ????? ????????? ??? ????? ??????? ?? ?????? ?????????.

??? ????? ?????? ??????? ???? ??????? ?? ?????? ??????? ??? ?????? 60 ?????? ?? 10 ????? ?? ?????? ????? ?????? ????????? ??????? ??????? ????? ??????? ???? ?????????????? ?????? ?????????????? ??????? ?? ??? ????? ?? ????? ???????? ????? ?? ???? ????? ??????? ??? ???????? ?? ?????? ??????? ?????????? ?? ?????? ???????? ???????? ?? ?????? ???????? ?? ???????? ??????? ???????. ???? ????? ???? ??? ????? ???? ?????? ?????? ?????? ???????? ?? ??????? ??????: "???? ????? ??????? ?? ???????? ??? ??????? ?? ????? ????????? ???????? ???????? ?????? ??????? ??? ?????? ???????? ????? ?? ?????? ???????".

???? ???? ????? ???? ??? ????? ?????? ??????? ?????? ???????? ?? ?????? ??????? ??? ????? ????????: "?? ????? ???? ????? ??? ?????? ?????? ??????? ?????? ????? ??????? ?? ??????? ????? ????? ??????? ????? ??????? ????????? ???? ??????? ?? ?? ??? ???. ????? ??? ??????? ??? ???????? ??????? ????????? ?? ?????? ???????? ?????????? ?????? ????? ?????? ??????? ???????? ??? ????? ???? ????????".