Table 4: Effect of different tillage treatments on corn and soybean yields during 1989–2012 at Dixon Springs.

TillageCrop yield (Mg ha−1)

Corn year1989199119931995199719992001
NT8.99b*6.57a11.79a11.60a9.87a8.12a9.73b
CP9.99b6.10a11.61a11.55a9.32a6.78b9.60b
MP11.26a6.60a10.98a10.37a9.59a6.98b10.34a

Year2003200520072009201112-yr ave.% of MP yield
NT6.67a11.40a6.46a13.10a6.13a9.18a96
CP7.33a11.82a6.80a13.60a6.85b9.24a97
MP7.82a11.41a7.33a14.03b7.68ab9.53a100

Soybean year1990199219941996199820002002
NT2.37a3.74a2.87a2.63a2.63a2.32a2.37a
CP2.62a3.46a1.81b2.27a2.63a2.38a2.07a
MP2.62a3.65a1.49b2.43a2.75a2.32a1.98b

Year2004200620082010201212-yr ave.% of NT yield
NT0a3.17ab2.84a2.94a2.65a2.54a100
CP0a3.37a2.84a2.79a1.96b2.35a93
MP0a3.10b3.04a2.88a1.82b2.34a92

*For each crop means in a same year followed by the same letter is not significantly different at the probability level.