fertilization

Nitrogen dynamics in arctic tundra soils of varying age: differential responses to fertilization and warming.

http://download.springer.com/static/pdf/23/art%253A10.1007%252Fs00442-01...

Abstract

http://www.sciencedirect.com.proxy.lib.iastate.edu/science/article/pii/S...

http://www.esajournals.org/doi/pdf/10.1890/10-0426.1