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Campbell, C. A., Zentner, R. P., Selles, F., Jefferson, P. G., McConkey, B. G. Lemke, R. and Blomert, B. J. (2005) Long-term effect of cropping systems and nitrogen and phosphorus fertilizer on production and nitrogen econ- omy of grain crops in a Brown Chernozem. Canadian Journal of Plant Science, 85, 81-93.

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