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Carlos Nieto-Cabrera, C. Francis, C. Caicedo, , M. Rivera, Response of Four Andean Crops to Rotation and Fertilization, Mountain Research and Development, Vol. 17, No. 3, The United Nations University. Managing Fragile Ecosystems in the Andes (Aug., 1997), pp. 273-282
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Nieto-Cabrera et al. (1997) studied this question.
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