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R. N. Ames, L. K., St. Porter, T. V. John and C. P. P. Reid, “Nitrogen Sources and ‘A’ Values for Vesicular-Arbuscular and Non-Mycorrhizal Sorghum Grown at Three Rates of 15N-Ammonium Sulphate,” New Phytologist, Vol. 97, No. 2, 1984, pp. 269-276.
http://dx.doi.org/10.1111/j.1469-8137.1984.tb04131.x

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