Sources of data used in the analysis (available as accessory material on request)

Anderson G, Fillery I, Dolling P and Asseng S (1998) Nitrogen and water flows under pasture - wheat and lupin-wheat rotations in deep sands in Western Australia 1. Nitrogen fixation in legumes, net N mineralisation, and utilisation of soil-derived nitroge
Armstrong EA, Heenan DP, Pate JS and Unkovich MJ (1997) Nitrogen benefits of lupins, field pea and chickpea to wheat production in south-eastern Australia. Australian Journal Agricultural Research 48, 39-47.
Armstrong EL, Pate JS and Unkovich MJ (1994) Nitrogen balance of field pea crops in south western Australia, studied using the 15N natural abundance technique. Australian Journal Plant Physiology 21, 530-549.
Bell MJ, Wright GC, Suryantini and Peoples MB (1994) The N2-fixing capacity of peanut cultivars with differing assimilate partitioning characteristics. Australian Journal Agricultural Research 45, 1455-1468.
Bergersen FJ, Brockwell J, Gault RR, Morthorpe L, Peoples MB and Turner GL (1989) Effects of available soil nitrogen and rates of inoculation on nitrogen fixation by irrigated soybeans and evaluation of δ15N methods for measurement. Australian Journal of
Bowman AM, Smith W, Mullen C and Peoples M (2002) Do lucerne varieties vary in the amount of nitrogen they fix? In 'Fixed nitrogen in sustainable agricultural systems; Proceedings of the 13th Australian Nitorgen Fixation Conference'. Glenelg
Brockwell J, Gault R, Peoples M, Turner G, Lilley D and Bergersen F (1995) N2 fixation in irrigated lucerne grown for hay. Soil Biology Biochemistry 27, 589-594.
Dalal R, Strong W, Doughton J, Weston E, McNamara G and Cooper J (2004) Sustaining productivity of a vertisol at Warra, Queensland, with fertilisers, no-tillage, or legumes 7. Yield, nitrogen and diseas- break benefits from lucerne in a two-year lucerne-w
Dear BS, Cocks PS, Peoples MB, Swan AD, Smith AB (1999) Nitrogen fixation by subterranean clover (Trifolium subterraneum L.) growing in pure culture and in mixtures with varying densities of lucerne (Medicago sativa L.) or phalaris (Phalaris aquatica L.).
Dear BS, Sandral GA, Peoples MB, Wilson BCD, Taylor JN and Rodham CA (2003) Growth, seed set and nitrogen fixation of 28 annual legume species on 3 vertosol soils in southern New South Wales. Australian Journal of Experimental Agriculture 43: 1101-1115.
Evans J, Turner GL, O'Connor GE and Bergersen FJ (1987) Nitrogen fixaton and accretion of soil nitrogen by field grown lupins. Field Crops Research 16, 309-322.
Gault RR, Peoples MB, Turner GL, Lilley D, Brockwell J and Bergersen FJ (1995) Nitrogen fixation by irrigated lucerne during the first three years after establishment. Australian Journal Agricultural Research.
Hackney B, Dear B, Peoples M, Dyce G and Rodham C (2008) Herbage production, nitrogen fixation and water use efficiency of ten annual pasture legumes grown with and without lime on an acid soil. In: Proc 14th Australian Agronomy Conference, Adelaide (MJ U
Hayes RC, Dear BS, Orchard BA, Peoples MB, Eberbach PL (2008) Responses of subterranean clover, balansa clover, and gland clover to lime when grown in mixtures on an acid soil. Australian Journal of Agricultural Research 59: 824-835.
Herridge DF, Marcellos H, Felton WL, Turner GL and Peoples MB (1995) Chickpea increases soil N fertility in cereal systems through nitrate sparing and N2 fixation. Soil Biology Biochemistry 27, 545-551.
Horn C, Dalal R, Birch C and Doughton J (1996) Sowing time and tillage practice affect chickpea yield and nitrogen fixation 2. Nitrogen accumulation, nitrogen fixation and soil nitrogen balance. Australian Journal Experimental Agriculture 36, 701-706. (an
Khan DF, Peoples M, Schwenke G, Felton WL, Chen D and Herridge DF (2003) Effects of below-ground nitrogen on N balances of field-grown fababean, chickpea and barley. Australian Journal of Agricultural Research 54, 333-340.
Marcellos H, Felton W and Herridge D (1998) Chickpea in wheat based cropping systems of northern New South Wales I. N2 fixation and influence on soil nitrate and water. Australian Journal of Agricultural Research 49, 391-400.
McCallum M, Peoples M and Connor D (2000) Contributions of nitrogen by field pea (Pisum sativum L.) in a continuous cropping sequence compared with lucerne (Medicago sativa L.) -based pasture ley in the Victorian Wimmera. Australian Journal Agricultural R
McNeill A, Unkovich M and Slattery JF (2000) 'Managing nitrogen fixation inputs by crop, forage and pasture legumes on alkaline soils in southern Australia.' GRDC, UWA196WR, Canberra.
O,Connor, G E. Agronomic management of field pea (Pisum sativum) for N2 fixation and soil N improvement.MSc Thesis University of Melbourne 1993
Peoples M and Baldock J (2001) Nitrogen dynamics of pastures: nitrogen fixation inputs, the impact of legumes on soil nitrogen to Australian farming systems. Australian Journal of Experimental Agriculture 41, 327-346.
Peoples MB, Bowman A, Gault R, Herridge D, McCallum M, McCormick K, Norton R, Rochester I, Scammell G, Schwenke G (2001) Factors regulating the contributions of fixed nitrogen by pasture and crop legumes to different farming systems of eastern Australia.
Peoples MB, Brockwell J, Herridge DF, Rochester IJ, Alves BJR, Boddey RM, Dakora FD, Bhattari S, Maskey SL, Sampet C, Rerkesam B, Khan DF, Hauggaard-Nielsen H, Jensen ES (2009) Review article. The contributions of nitrogen-fixing crop legumes to the produ
Peoples MB, Gault RR, Scammell GJ, Dear BS, Virgona J, Sandral G, Paul J, Wolfe EC and Angus JF (1998) Effect of pasture management on the contributions of fixed N to the N economy of ley-farming systems. Australian Journal of Agricultural Research 49, 45
Peoples, MB (unpublished)
Rochester I and Peoples M (2005) Growing vetches (Vicia villosa Roth) in irrigated cotton systems: inputs of fixed N, N fertiliser savings and cotton productivity. Plant and Soil 271: 251-264.
Rochester I, Peoples M, Constable GA and Gault R (1998) Faba beans and other legumes add nitrogen to irrigated cotton cropping systems. Australian Journal of Experimental Agriculture 38, 253-260.
Rochester IJ, Peoples MB, Hulugalle NR, Gault RR and Constable GA (2001) Using legumes to enhance nitrogen fertility and improve soil condition in cotton cropping systems. Field Crops Research 70, 27-41.
Schwenke G, Peoples G, Turner G and Herridge D (1998) Does nitrogen fixation of commercial dryland chickpea and faba bean crops in north-west New South wales maintain or enhance soil nitrogen? Australian Journal of Experimental Agriculture 38, 61-70.
Smith CJ, Chalk PM, Noble CL, Prendergast JB and Robertson F (1993) Nitrogen fixation in a white clover-grass pasture irrigated with saline groundwater. Irrigation Science 13: 189-194.
Unkovich MJ, Pate JS and Hamblin MJ (1994) The nitrogen economy of broadacre lupin in southwest Australia. Australian Journal Agricultural Research 45, 149-164.
Unkovich MJ, Sanford P, Pate JS and Hyder M (1998) Effects of grazing on plant and soil nitrogen relations of pasture-crop rotations. Australian Journal of Agricultural Research 49, 475-485.
Unkovich, MJ (unpublished)

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