Table 3: Effect of different tillage treatments on the corn and soybean populations during 1989–2012 at Dixon Springs.

Plant population (1000 plants ha−1)

Corn year198919911993199519971999
NT55.3b*57.9a51.4a58.8ab46.9a69.2a
CP59.2ab47.4b54.1a55.7b51.9a64.2ab
MP62.9a52.2ab52.6a62.2a51.9a62.7b

Year20012003200520072009201112-year average
NT64.5a59.5a70.5b68.8a65.0a75.7a59.4a
CP56.5b61.3a76.0a68.5a65.5a67.7ab58.6a
MP65.9a60.0a69.5b68.3a64.0a61.3b60.2a

Soybean year199019921994199619982000
NT191.0b*344.0a303.0a263.0b271.0b422.0a
CP247.0a335.0a229.0b277.0b273.0b398.0a
MP249.0a343.0a181.0c309.0a294.0a405.0a

Year20022004200620082010201212-year average
NT293.0b240.0a320.0a310.0b294.0a168.5a284.4a
CP393.0a228.0a363.0b390.0a279.0a125.6b296.5a
MP420.0a255.0a388.0c360.0ab288.0a176.0a297.8a

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