In the spring of each year the MP and CP plots were moldboard and chisel plowed followed by disking twice
and planting. In even numbered years soybean was planted at 432,000 seeds∙ha−1 with no fertilizer. In odd numbered
years corn was planted at the seeding rate of 64,000 seeds∙ha−1 with fertilizers of 218 kg∙ha−1 N, 55 kg∙ha−1
P, and 232 kg∙ha−1 K. Chemical weed control practices were utilized during the study