Abstract
In the past few years, organic farming has been proposed as a possible way of reducing N leaching from agricultural soils and improving the use efficiency of plant nutrients. This is, to a large extent, considered to be attributed to the fact that synthetic fertilisers are not allowed in such systems and the N inputs mainly originate in various types of organic manures. In this overview, results from a number of Swedish field studies are presented in which crop yields, nutrient-use efficiencies and leaching in organic and conventional systems are evaluated. Some studies were conducted in lysimeters and others in large tile-drained field plots. In two lysimeter experiments, leaching of N derived from either poultry manure or red clover (Trifolium pratense L.) green manure were compared with fertiliser N, all labeled with 15-N. In the lysimeters on which poultry manure was applied, 32% of N applied leached during three years, whereas only about 3% leached in ammonium nitrate fertilised lysimeters. In plots on a sandy soil, annual N leaching loads averaged over the whole 6-yr crop rotation reached 39,kg N ha-1 in the organic rotations and 25,kg N ha-1 in the conventional rotation. Phosphorus-leaching loads were overall small in all systems, whereas K leaching was highest in the conventional rotation (i.e., on average, 27,kg ha-1 yr-1). In terms of crop yields, they were reduced by 20–80% in the organic rotations compared to the same crops in the conventional rotations. This was explained in terms of N deficiency, weed competition, and infestation of crop diseases in the organic systems. These results suggest that organic crop production uses agricultural soils less efficiently, with no benefit for water quality.
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Bergström, L., Kirchmann, H., Aronsson, H., Torstensson, G., Mattsson, L. (2009). Use Efficiency and Leaching of Nutrients in Organic and Conventional Cropping Systems in Sweden. In: Kirchmann, H., Bergström, L. (eds) Organic Crop Production – Ambitions and Limitations. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9316-6_7
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DOI: https://doi.org/10.1007/978-1-4020-9316-6_7
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