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Roots: A wide world under our very feet

...especially in plants that grow in soils where phosphorus is in short supply. These plants form "cluster roots" on their main root systems - a sort of on-demand phosphorus pump, produced only when needed. Cluster roots look like bottlebrushes, a dense...

http://www.juneauempire.com/stories/012708/out_240865540.shtml
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