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.
Udgivelsesår10 sep. 2018
Antal sider1
StatusUdgivet - 10 sep. 2018
Begivenhed6th Symposium on Phosphorus in Soils and Plants - KU University, Leuven, Belgien
Varighed: 10 sep. 201813 sep. 2018


Konference6th Symposium on Phosphorus in Soils and Plants
LokationKU University

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