Changes in soil organic matter and phosphorus fractions under planted fallows and a crop rotation system on a Colombian volcanic-ash soil

Author: Phiri S.   Barrios E.   Rao I.M.   Singh B.R.  

Publisher: Springer Publishing Company

ISSN: 0032-079X

Source: Plant and Soil, Vol.231, Iss.2, 2001-04, pp. : 211-223

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