Abstract

Soil phosphorus (P) availability was assessed with four different soil P tests on seven soils of the Ultuna long-term field experiment (Sweden). These four soil P tests were (1) P-H2O (water extractable P); (2) P-H2OC10 (water extractable P upon 10 consecutive extractions); (3) P-AL (ammonium lactate extractable P) and (4) P-C-DGT (P desorbable using diffusive gradients in thin films). The suitability of these soil P tests to predict P availability was assessed by correlation with plant P uptake (mean of preceding 11 years) and soil P balancing (input vs. output on plot level for a period of 54 years). The ability to predict these parameters was in the order P-H2OC10 > P-C-DGT > P-H2O > P-AL. Thus, methods considering the P-resupply from the soil solid phase to soil solution performed clearly better than equilibrium-based extractions. Our findings suggest that the P-AL test, commonly used for P-fertilizer recommendations in Sweden, could not predict plant P uptake and the soil P balance in a satisfying way in the analysed soils.

Keywords

soil testing; macronutrient; phosphorus desorption; nutrition; fertilization; saturation index

Published in

Plant, Soil and Environment
2018, Volume: 64, number: 9, pages: 441-447
Publisher: CZECH ACADEMY AGRICULTURAL SCIENCES

SLU Authors

• Parvage, Masud

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

• Kirchmann, Holger

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Soil Science


Publication identifier

DOI: https://doi.org/10.17221/313/2018-PSE

Permanent link to this page (URI)

https://res.slu.se/id/publ/96584