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Nutrient and growth responses of Leersia oryzoides, rice cutgrass, to varying degrees of soil saturation and water nitrogen concentration

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Leersia oryzoides (rice cutgrass) is an obligate wetland plant common to agricultural ditches. The objective of this greenhouse study was to quantify the allocation of nutrients and biomass to different plant components exposed to various soil moisture and aqueous N input regimes. Plants in the continuously flooded treatment had the highest tissue concentrations of Cu, S, Zn, K, Na, and Mn in one or more plant components. The partially flooded treatment had the highest concentrations of Mg in leaves and of Na in adventitious roots. The N input regimes significantly affected concentrations of P and S in adventitious roots. Leaf, stem, and adventitious root biomass were highest in partially flooded plants. Continuously flooded plants allocated the least resources to rhizome production. These results indicate that L. oryzoides may significantly affect elemental concentrations in surface waters by its ability to uptake various elements and subsequent sequestration in various biomass components.
Melissa B. Koontz , Joshua M. Koontz , S. R. Pezeshki , Matthew Moore
USDA Scientist Submission
Journal of plant nutrition 2013 10 25 v.36 no.14
Journal Articles, USDA Authors, Peer-Reviewed
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