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10088. Cowie, A.L., R.S. Jessop and D.A. MacLeod. 1990. Effect of soil nitrate on the growth and nodulation of winter crop legumes.. Austral. J. Expt. Agric. 30:651-654..
The relative effect of increasing external nitrate supply on the nodulation of three winter crop legumes was examined in a controlled environment experiment. Lupin, chickpea and field pea were grown at two nitrate concentrations of 2 and 8 mmol/L for 40 days. Shoot and root growth were not affected by nitrate contrations. Increased nitrate concentrations significantly reduced nodule number and nodule weight in all species. The inhibition of nodulation by increased nitrate concentrations was greatest in peas, followed by chickpeas, and least in lupins.