|Blombäck, Karin - Swedish University Of Agricultural Sciences|
|Hesse, Kathrin - Swedish University Of Agricultural Sciences|
|Lindsjö, Anders - Swedish University Of Agricultural Sciences|
|Linefur, Helena - Swedish University Of Agricultural Sciences|
Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 7/25/2018
Publication Date: 11/7/2018
Citation: Bolster, C.H., Blombäck, K., Hesse, K., Lindsjö, A., Linefur, H. 2018. Establishing pedotransfer functions for estimating P solubility in Swedish soils. American Society of Agronomy Meetings. Paper No. 1079.
Technical Abstract: Eutrophication due to excess P loading to fresh water and marine water bodies is a problem in Sweden and for the Baltic Sea region. To address eutrophication problems, there is need to establish environmentally protective regulations and planning of fertilization practices. This has led to a demand for simple decision support tools to identify agricultural soils at high risk for P leaching. The aim of this study was to establish pedotransfer functions between soil properties and soluble P on a broad selection of Swedish arable soils. Sixty-two topsoil samples were analyzed for texture, pH, total carbon, soil test P, P sorption indices, aluminum and iron content, and degree of P saturation. Calcium chloride extractable P was used as a measure of P solubility. P-sorption characteristics was determined for 10 of the soils using sorption isotherm experiments and the data were fitted to Langmuir and Freundlich equations to estimate sorption coefficients. The sorption coefficients were well correlated to the soil chemical characteristics. Results also showed that P solubility was well correlated with different estimates of the degree of P saturation.