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Book of Abstracts First Legume Society Conference 2013: A Legume Odyssey Novi Sad, Serbia, 9-11 May 2013
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Phosphorus efficiency in faba bean and narrow-leafed lupin
Clara I Lizarazo, Frederick L Stoddard
University of Helsinki, Faculty of Agriculture and Forestry, Helsinki, Finland
Phosphorus (P) is the second most important element for plant growth. P fertilizers are applied
to agricultural soils in order to make P available to crops and meet their nutritional requirements,
but this contributes to negative environmental impacts such as eutrophication. Legumes have
been known to enhance the soil nutritional status by fixing nitrogen; in addition, they can
mobilize P from less labile P pools, improving soil fertility and structure and thus can be a source
to improve the nutrition of subsequent crops. Faba bean (cv. ‘Kontu’) and narrow-leafed lupin
(cv. ‘Haags Blaue’) were grown in a crop rotation trial at Viikki, Helsinki, Finland in 2011 and
2012. Seeds were inoculated with appropriate rhizobium and plots were fertilized with 125 kg/ha
of 16-7-13 fertilizer. At maturity, 50 plants per plot were selected, separated into shoots and
roots, roots were washed, and all components were oven-dried at 80°C. P content of soil and
plant samples was determined by inductively coupled plasma-optical emission spectrometry
(ICP). Faba bean showed 50% higher root P absorption efficiency (P