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Assessing the depletion of soil P following sequential extractions with mehlich-3 and olsen solutions

Messiga, A.J., Ba, Y., Ziadi, N., Bélanger, G., Lafond, J. (2014). Assessing the depletion of soil P following sequential extractions with mehlich-3 and olsen solutions, 60(10), 1445-1458. http://dx.doi.org/10.1080/03650340.2014.884709

Abstract

© 2014 Crown. We analyzed in soils with contrasting cultivation histories the depletion of P following sequential extractions with soil testing solutions. Soil samples were collected in three experiments in eastern Canada (L’Acadie, Lévis, and Normandin) and P was sequentially extracted 16 times, once daily, using Mehlich-3 (M3) or Olsen (Ol) solution. The cumulative amount of P extracted was 252 mg PM3 kg−1 and 77 mg kg−1 POl for L’Acadie, 212 mg PM3 kg−1 and 66 mg POl kg−1 for Lévis, and 424 mg PM3 kg−1 and 83 mg POl kg−1 for Normandin. The depletion of P was described by a logarithmic function (Y = a ln (N) + b) for PM3, and a power function (Y = αNβ) for POl. The inorganic P pool decreased in the three soils. The organic P pool did not decrease possibly because soil testing solutions did not directly extract P from this pool. This study demonstrated that laboratory soil testing analysis using M3 or Ol solution principally target P from the inorganic pool, suggesting that P fertilizer recommendations to mineral soils relying on these methods do not account for the potential of the organic P pool to contribute to soil P availability.

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