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1.Communications in Soil Science and Plant Analysis
Volume 21, Issue 19-20, 1990
V. J. G. Houbaa, I. Novozamskya, Th. M. Lexmonda & J. J. van der Leea
pages 2281-2290
Applicability of 0.01 M CaCl2 as a single extraction solution for the assessment of the nutrient status of soils and other diagnostic purposes

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http://dx.doi.org/10.1080/00103629009368380

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