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4115. Mathers, A.C., B.A. Stewert and B. Blair. 1975. Nitrate-nitrogen removal from soil profiles by alfalfa.. J. Environmental Quality, 4(3):403-405.
Alfalfa was shown to be effective in removing nitrate from soil profiles deeper than the annual crop rooting zone. In spite of being a N-fixer, alfalfa will utilize nitrogen from the soil first. It can be used in rotation with annual crops to reduce groundwater contamination by agricultural applications of N. T: Nitrate-N removal from soil by alfalfa by depth.