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Bengough 2012 Water dynamics of the root zone. . . Vadose Zone Journal
http://vzj.geoscienceworld.org/content/11/2/vzj2011.0111.full.pdf+html?s...
*note, article is Open Access
Plant-produced protease Adamczyk et al. 2007, 2008, 2009
Godlewski & Adamczyk 2007. The ability of plants to secrete protease by roots:
http://www.sciencedirect.com.proxy.lib.iastate.edu:2048/science/article/...
Adamcyzk et al. 2008. Wheat seedlings secrete proteases from the roots. . .:
http://onlinelibrary.wiley.com.proxy.lib.iastate.edu:2048/doi/10.1111/j....
Adamcyzk et al. 2009. Degradation of proteins by enzymes exuded by Allum porrum roots. . .: