Abstract
In the present field study, the effects of applying biogas slurry for 25 years on soil microbiological and soil chemical properties were investigated in comparison with the application of raw cattle slurry. An on-farm research approach was used with pairwise comparison of neighboring fields, taking samples at a high spatial resolution from two biodynamic farms down to 10 cm. Texture, soil organic C (SOC), total N and P, microbial biomass C, N, and P as well as P fractions were determined by different extraction procedures. Application of biogas slurry had no significant effects on SOC, total N, or microbial biomass C, N, and P. Clay and pH effects outweighed site-specific differences for most properties. Biogas slurry increased the fractions of plant-available inorganic phosphate (+66 % more Olson-Pi) and of Ca-associated phosphates (+40 % 1 M HCl-Pi) at the expense of hardly soluble Fe and Al phosphates (-25 % 6 M HCl-Pi). This is in line with the observation that biogas slurry contains significantly more H2O-Pi and 1 M HCl-Pi than raw slurry. The long-term application of biogas slurry had no negative impacts on any of the soil properties analyzed.
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We would like to thank Karl Kuch and Gerhard Kuch for access to their sites and the information on their management systems. The technical assistance of Gabriele Dormann and Ann-Kathrin Becker is highly appreciated. This project was supported in part by a grant of the Research Training Group 1397 “Regulation of soil organic matter and nutrient turnover in organic agriculture” from the German Research Foundation (DFG).
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Haase, C., Wentzel, S., Schmidt, R. et al. Changes in P fractions after long-term application of biogas slurry to soils under organic farming. Org. Agr. 6, 297–306 (2016). https://doi.org/10.1007/s13165-015-0135-1
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DOI: https://doi.org/10.1007/s13165-015-0135-1