Extractability of slurry and fertilizer phosphorus in soil after repeated freezing

Authors

  • H. SOINNE
  • T. PELTOVUORI

Abstract

The potential effects of freezing on phosphorus (P) chemistry in Finnish soils are not well known. We studied the effects of multiple freeze-thaw cycles on soil P chemistry in a laboratory incubation experiment with one organic and one mineral surface soil. The soils were incubated at +5°C or at alternating +5/20°C temperatures for 24 weeks, either without amendment or amended with pig slurry or with commercial compound fertilizer (NPK 2039). After incubation, the soils were analyzed for water-soluble reactive and unreactive P, and acid ammonium acetate soluble P (PAAA). Freezing and thawing of soils during the incubation had no significant effect on any of the water-soluble P fractions or PAAA. The outcome was most likely a consequence of the good P status of the soils, which masked the gentle effects of freezing. According to these results, the time of soil sampling (fall vs. spring) has no effect on P test results on soils with a good P status. Concentrations of soluble P after incubation were roughly twice as high in the slurry treatments than in the fertilizer treatments, demonstrating potentially better long-term availability of slurry P.;

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Articles

Published

2005-01-02

How to Cite

SOINNE, H., & PELTOVUORI, T. (2005). Extractability of slurry and fertilizer phosphorus in soil after repeated freezing. Agricultural and Food Science, 14(2), 181–188. https://doi.org/10.2137/145960605774826000