Phosphorus availability and farm structural factors: examining scarcity and oversupply in north‐east Germany |
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| Authors: | T F H Theobald K Daedlow J Kern |
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| Affiliation: | 1. Department of Bioengineering, Leibniz‐Institute for Agricultural Engineering Potsdam‐Bornim e.V., Potsdam, Germany;2. Division of Resource Economics, Humboldt‐Universit?t zu Berlin, Berlin, Germany;3. Leibniz Centre for Agricultural Landscape Research, Research Group Sustainability Impact Assessment, Müncheberg, Germany |
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| Abstract: | Assessing factors influencing phosphorus (P) availability in soils is important in preventing its overexploitation and excessive application in agricultural systems. Despite high historical P applications in the federal state of Brandenburg (Germany), county data on soil test P (STP) reveal considerable disparities in soil available P. In addition, negative soil balances as a result of small mineral P and manure inputs have been observed, raising questions about the factors leading to this situation. Our work focused on identifying possible causes operating at the farm management level by conducting a letter survey in two administrative districts of Brandenburg, the counties Barnim and Uckermark, linking farm management factors (ownership type, farm size, land tenure, animal husbandry with or without grassland and its intensity, presence of a biogas plant and organic production) to farmers’ self‐indicated levels of STP. Small‐ to medium‐sized individual farms tended to have (very) high STP, while large partnership farms and companies/cooperatives were sensitive to factors resulting in low STP. Farms with low shares of land ownership, the presence of grassland, extensive cattle farming and stockless organic farming had lower STP. On the other hand, biogas plants, partly in combination with intensive livestock (cattle) farming, were associated with larger STP. It was concluded that more care should be devoted to the design of agricultural policies and that further (inter‐ and transdisciplinary) research on this topic is needed. |
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| Keywords: | Soil phosphorus availability ownership type land tenure biogas plants organic farming animal husbandry |
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