Corn Hybrid Response to Water Management Practices on Claypan Soil

Figure 1

Split-plot design at the MUDS site. A representative subplot randomization above and between tile lines was represented by the insert for drainage plus subirrigation (DSI 6) at a 6.1 m spacing. The boxes with different colors represent five different hybrids randomly planted in 3 by 9.1 m plots above and between the tile lines. In 2009, the nondrained, nonirrigated (NDNI) and nondrained, overhead irrigated (NDOHI) controls were split to include a delayed planting (DP) treatment to avoid confounding planting dates between systems. Corn plots in 2008 and 2010 were rotated to soybean, and soybean plots were rotated into corn in 2009.