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- D.M. Wheeler, S.F. Ledgard, C.A.M. de Klein, R.M. Monaghan, P.L. Carey, R.W. Mcdowell, K.L. Johns, OVERSEER® nutrient budgets - moving towards on-farm resource accounting , Proceedings of the New Zealand Grassland Association: Volume 65, 2003, Palmerston North
- S.F. Ledgard, D.A. Clark, M.S. Sprosen, G.J. Brier, E.K.K. Nemaia, Nitrogen losses from grazed dairy pasture, as affected by nitrogen fertiliser application , Proceedings of the New Zealand Grassland Association: Volume 57, 1996, Waitangi
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