Fig. 6
From: From complex histories to cohesive data, a long-term agricultural dataset from the Morrow Plots
Divisions, crops, and treatments over time for the three enduring crop rotations of the Morrow Plots. Crops grown and treatments applied changed at key phases of the experiment to reflect evolving farming practices in Illinois. Plots 3, 4, and 5 follow a one-, two-, and three-year crop rotation, respectively. Hay crops have varied but were primarily clover until 1952 and alfalfa thereafter. The plots were subdivided in Phases 2 and 3 as new treatment variables were introduced. Subplots were initially designated by direction (Northwest, Northeast, etc.). Since Phase 3, each plot has been divided into four Northern subplots (NA, NB, NC, and ND) and four Southern subplots (SA, SB, SC, and SD).
