Tuesday, 8 November 2005
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This presentation is part of: Characterization and Environmental Impacts of Phosphorus

Plant Growth and Phosphorus Uptake Kinetics of Three Riparian Grass Species.

John Kovar and Norbert Claassen.

Phosphorus (P) losses from agricultural landscapes contribute significantly to eutrophication of surface waters. The total amount of P absorbed by plants growing in or near grass filter strips and riparian buffers can be determined, but we have little knowledge of the pattern of accumulation/depletion during the course of a growing season, nor do we understand how plants respond to influxes of dissolved P that occur after rainfall events. In this study, we evaluated P acquisition efficiency of switchgrass (Panicum virgatum L.), smooth bromegrass (Bromus inermis Leyss.) and reed canarygrass (Phalaris arundinacea L.) grown in a flowing nutrient solution culture system at mean solution P concentrations of 1 and 100 µmol L-1. Plants were harvested four times. Changes in shoot and root growth, P influx, and P uptake kinetics were determined, and species differences compared.

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