Time travel and soil quality
Kitty O’Neil and Sieglinde Snapp, Horticulture


Data from: The Morrow Plots: A Century of Learning
[http://www.cropsci.uiuc.edu/research/rdc/urbana/morrow.cfm]
* Corn / Oats rotation was changed to Corn / Soybeans in 1967
** Clover is seeded in spring after winter fallow
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