Nutrient Use Efficiencies and Leaching of Organic and Conventional Cropping Systems in Sweden

Autor: Lars Bergström, Gunnar Torstensson, Helena Aronsson
Rok vydání: 2006
Předmět:
Zdroj: Agronomy Journal. 98:603-615
ISSN: 1435-0645
0002-1962
DOI: 10.2134/agronj2005.0224
Popis: Organic farming has been proposed as a means of reducing leaching and improving the use efficiency of plant nutrients in agriculture. In such systems, nutrient inputs originate from various organic sources or from naturally occurring minerals with low solubility. In this study, measurements of leaching and crop uptake of N, P, and K and determinations of mineral N in soil were conducted in tile-drained plots during a 6-yr period in two organic crop rotations, one with and one without addition of animal manures. In the latter, N was provided by green manures. For comparison, two conventional systems in which mineral fertilizers and pesticides were used (one with cover crops) were also included. Leaching loads of N were smallest in the conventional system with cover crops, on average 25 kg N ha -1 yr -1 over the 6-yr period. The corresponding amounts in the other systems were 39 (organic with animal manure), 34 (organic without animal manure), and 38 (conventional) kg N ha -1 . Phosphorus-leaching loads were small overall in all systems (
Databáze: OpenAIRE
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