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Tillage System by Planting Date Interaction Effects on Corn and Soybean Yield

Agronomy Hall, Iowa State Univ., Ames, IA 50011-1010

View larger version (16K): [in this window] [in a new window]   Fig. 1. Tillage system x planting date interaction for number of corn plants emerged in 2002. The LSD(0.05) value is 7.65 x 103. The early planting date was 11 April, the intermediate planting date was 16 April, and the late planting date was 6 May.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Tillage system x planting date interaction for number of corn plants emerged in 2004. The LSD(0.05) value is 7.65 x 103. The early planting date was 12 April, the intermediate planting date was 16 April, and the late planting date was 3 May.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Soil daily maximum temperature at 0.05-m depth for three tillage systems from 5 April (Day 95) until 30 May (Day 151), 2002. Arrows indicate corn planting dates.