Abstract
Today on many sites organic farming might neglect phosphorus (P) fertilization due to soil reserves build up by P fertilization of former farming systems. Additionally organic farming has restricted itself to the use of non-solubilised rock phosphate as mineral fertilizer source that only has limited plant availability on agricultural soils with adequate pH. Also recycling of P from the food chain back to organic agriculture is not consequently realised. These predicaments of organic farming endanger its future sustainability. The article gives an overview on the state of knowledge of the use of topsoil and subsoil P reserves by plants in organic production, on possibilities to activate them by biological measures for direct use by plants and for their redistribution on farms. As in legislation phosphate rock is defined as prevailing mineral fertilizer source for organic farming, a detailed view is given on the use of its P in dependence of plant variety. Also attempts to improve its fertilizer value by mixtures with organic matter are reviewed. It is obvious that plant roots and soil organisms can activate P from the soil and keep it in biological turnover. This is a promising concept to use soil reserves, but quantification of time-spans offering sufficient P supply just by this approach is not possible. Therefore, while promoting root density, root penetration and biological activity in soils, site specific analyses of plant available P in soil, analyses of field and farm P-budgets as well as of plants P supply are necessary to decide on P-fertilization. Soluble P sources, preferably from recycling processes, should be developed for future fertilization demands of organic farming.
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Paulsen, H.M., Köpke, U., Oberson, A., Rahmann, G. (2016). Phosphorus—The Predicament of Organic Farming. In: Schnug, E., De Kok, L. (eds) Phosphorus in Agriculture: 100 % Zero. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7612-7_10
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