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Effect of Late Season Water Stress on Corn in Northwest Kansas

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121337206.(doi:10.13031/2013.42458)
Authors:   Freddie R Lamm, Abdrabbo A Aboukheira
Keywords:   Corn, irrigation, water management, management allowed depletion, production function

Four separate studies were conducted over the years 1993 through 2008 at the Kansas State University Northwest Research Extension Center at Colby, Kansas to examine the effects of post-anthesis (after silking) water stress on field corn. Prior to anthesis, all treatments in each of the studies were fully irrigated according to their need. The results of these studies suggest that corn yield is nearly linearly related to the amount of crop water use during the post-anthesis period and that total crop water use amounts during the period may average nearly 430 mm. Producers should plan for crop water use during the last 30 and 15 day periods that may average nearly 125 and 50 mm, respectively, to avoid yield reductions. Management allowable depletion during the post-anthesis period should be limited to 45% of the available soil water for a 2.4 m profile on the deep silt loam soils of this climatic region.

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