Soils were sampled from Kellogg Biological Station Long Term Ecological Station (KBS/LTER) in Hickory Corners MI.

All the six repetitions from T1, T2, T4, and T7 were sampled, the samples were composite samples; for DF and SF, the three repetitions were sampled and each of the five sub-repetitions were also sampled, making a total of 15 samples per each DF and SF repetition. The treatments sampled were:

Key to treatment abbreviation at KBS/LTER used in this experiment
DF Decidous forest
SF Sucessional field
T1 Conventional wheat/corn/soybean conventional till
T2 No-till wheat/corn/soybean no till
T4 Reduced-input organic wheat/corn/soybean + clover
T7 T7    Early successional community

Fig. 1.  Aerial image of the KBS/LTER sites, picture taken from the KBS/LTER website:  http://lter.kbs.msu.edu/experimentalDesign.htm


"Support for this research was also provided by the NSF Long-Term Ecological Research Program at the Kellogg Biological Station and by the Michigan Agricultural Experiment Station."