TY - THES A1 - Richter, Sebastiaan T1 - The influence of lime, iron sulphate-lime mixtures, and iron compounds on bioavailable phosphorous N2 - Available nutrients for higher plants in the soil are crucial in agriculture and can be repressed by farming practices. The objective of this thesis was to determine if the application of a lime-FeSO4 mixture reduces the available phosphorus for higher plants further than conventional liming. For this, soils from the Lower Rhine region in Germany with different soil properties were collected, treated with different applications, and incubated over a predefined time. Aerobic and anaerobic conditions were created by raising the soils’ water content to 50% and 100% of their maximum water holding capacity. Bioavailable phosphorus was extracted from the incubated samples with the Calcium-acetate-lactate (CAL) method, and analysed in the Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Statistical analysis was conducted with the open-source program “R for statistical computing”. Results showed that not the treatment but rather the type of soil had a significant effect on the phosphorus availability. At some extent the WHC significantly influenced the phosphorus availability. In general, lime-FeSO4 mixtures showed a tendency to have higher phosphorus availability than conventional liming. Effects of long-term field application cannot be determined because the experiment was conducted under laboratory conditions for a limited time. For farming, further field experiments and monitoring of fields where the lime-FeSO4 mixtures are regularly applied can exclude negative long-term effects and determine sufficient the effect of lime-FeSO4 mixtures on bioavailable phosphorus. KW - Phosphorus KW - Liming KW - Bioavailability Y1 - 2018 ER -