Iowa State University From the SelectedWorks of Andrew W. Lenssen April, 2007 Dryland plant biomass and soil carbon and nitrogen fractions on transient land as influenced by tillage and crop rotation Andrew W. Lenssen, United States Department of Agriculture Upendra M. Sainju, United States Department of Agriculture ecan Caesar-onat, United States Department of Agriculture Jed Waddell, United States Department of Agriculture Available at: hps://works.bepress.com/andrew_lenssen/23/