Soinne, Helena and Peltovuori, Tommi (2005) Extractability of slurry and fertilizer phopshorus in soil after repeated freezing. Agricultural and Food Science, 14 (2), pp. 181-188.
- Published Version
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 20–3–9). 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.
|EPrint Type:||Journal paper|
|Keywords:||fertilizers, freezing, incubation, phosphorus, pig, slurry, soil analysis,|
|Subjects:||Crop husbandry > Composting and manuring|
|Research affiliation:||Finland > Univ. Helsinki|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||09 Mar 2010 11:45|
|Last Modified:||12 Apr 2010 07:43|
|Refereed:||Peer-reviewed and accepted|
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