A study evaluated corn (Zea mays L.) hybrids (Asgrow785, DKC61-73, DKC63-42, LG2642, and Kruger2114) and water\r\nmanagement systems (nondrained, nonirrigated (NDNI); drained, nonirrigated (DNI) with subsurface drain tiles 6.1 and 12.2m\r\napart; drained plus subirrigated (DSI) with tiles 6.1 and 12.2m apart; nondrained, overhead irrigated (NDOHI)) on yields, plant\r\npopulation, and grain quality from2008 to 2010. Precipitation during this study was 36 to 283mmabove the past decade. Planting\r\ndate was delayed 18 d in the nondrained control in 2009, and additional delayed planting controls were included this year. Grain\r\nyields were similar in the 6.1- and 12.2 m-spaced DNI and DSI systems in 2008 and 2010, but plant population increased 74% and\r\nyields were 3.1Mg ha-1 greater with DSI at a 6.1m spacing compared to 12.2m in 2009. At a 6.1m spacing, DNI or DSI increased\r\nyield 1.1 to 6.6Mg ha-1 (10 to over 50%) compared to NDNI or NDOHI soil. High yielding hybrids achieved similar yields with\r\nDNI, while NDNI DKC63-42 had 1.2Mg ha-1 greater yields compared to DKC61-73. A 6.1m spacing for DNI claypan soils is\r\nrecommended for high yielding corn production.
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