URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://dx.doi.org/10.2134/agronj2008.0045NDOI Link
http://search.proquest.com/docview/304600330/fullt[...]08/02/2011Item is within a limited-access website
http://search.proquest.com/docview/304600330/fullt[...]08/02/2011PDF ReaderItem is within a limited-access website
https://dl.sciencesocieties.org/publications/aj/ar[...]11/02/2016Item is within a limited-access website
https://dl.sciencesocieties.org/publications/aj/pd[...]11/02/2016PDF ReaderItem is within a limited-access website