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Sabine Ravnskov

Distribution of fertilizer phosphate in a coarse sandy soil profile after different long-term liming strategies

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We studied the distribution of P in the profile of an arable coarse sandy soil at Jyndevad Experimental Station, Denmark, using plots treated with mineral fertilizer P and different rates of lime. Since 1942, lime has been added at three rates while P has been added at an annual rate of 15.6 kg P/ha since 1944. Reference treatments were no lime and no P additions since 1942/44. Soil cores (0-100 cm) were retrieved in autumn 2016 shortly after barley harvest. We hypothesized that long-term liming, and the resulting differences in soil solution pH and cation composition, affects P mobility and sorption properties in the soil profile, and that long-term liming and annual P addition increases soil C content in response to improved crop growth. Soil chemical properties (pH, total P, total inorganic (Pi) and organic P (Po), Olsen P, water extractable P (Pw), soil C, and oxalate-extractable P, Fe and Al) were determined in five depths. The P sorption index (PSI), based on addition of 50-mmol P kg-1 soil, and was used to evaluate soil sorption capacity. Soil pH significantly increased with increased liming addition to at least 70 cm depth. For P fertilized soil, total P, Pi, Olsen P, Pw and oxalate P were significantly higher in 0-30 cm than in soil depth below, indicating that P had not migrated down the soil profile. Liming significantly increased soil C in 0-30 cm. There were strong relations between oxalate-extractable Al and PSI, while the relations between oxalate-extractable Fe and PSI were weak. In conclusion, long-term mineral fertilizer P application only affected the distribution of P to 30 cm depth. P sorption capacity increased substantially with depth until 50 cm, and it was only moderately affected by liming and P additions until 30 cm depth. Furthermore, P sorption capacity was related to the presence of amorphous Al oxides, while the role of amorphous Fe oxides was inferior.
Original languageEnglish
Publication year10 Sep 2018
Number of pages1
Publication statusPublished - 10 Sep 2018
Event6th Symposium on Phosphorus in Soils and Plants - KU University, Leuven, Belgium
Duration: 10 Sep 201813 Sep 2018


Conference6th Symposium on Phosphorus in Soils and Plants
LocationKU University
Internet address

    Research areas

  • Liming, soil pH, P sorption properties

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