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Enhancing the Mineralizable Nitrogen Pool Through Substrate Diversity in Long Term Cropping Systems

^a Dep. of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
^b SW Kansas Research and Extension Center, Kansas State University, KS 67846
^c Statistical Consulting Service, College of Agricultural and Natural Resources, Michigan State University

View larger version (31K): [in a new window]   Fig. 1. Net mineralized N after 70 and 150 d of laboratory incubation for soil sampled from the diverse and monoculture cropping systems. Lower and upper case letters indicate significant differences in mineralized-N at Day 70 and 150, respectively (P < 0.05, Tukey-Kramer test).

View larger version (18K): [in a new window]   Fig. 2. Net mineralized N after 70 d of in situ incubation for the diverse and monoculture cropping systems. Bars followed by the same letter are not significantly different (P < 0.05, Tukey-Kramer test).

View larger version (15K): [in a new window]   Fig. 3. Comparison between laboratory and in situ incubation across cropping systems and addition of organic materials. Individual data points are the LS-means of 32 observations.