Wednesday, 9 November 2005 - 8:45 AM
243-3

Skip-Row Corn for Improved Drought Tolerance in Rainfed Corn.

Robert N. Klein1, J.A. Golus1, David Baltensperger1, Roger Elmore1, S. Knezevic1, Drew Lyon1, Stephen Mason1, Lenis Nelson1, Alexander Pavlista1, A.J. Schegel2, Charles Shapiro1, and Merle Vigil3. (1) University of Nebraska, 461 West University Drive, North Platte, NE 69101, (2) Kansas State University, SW Research Ext. Center, Garden City, KS 67846, (3) Central Great Plains Research Station, 40335 County Rd. GG, Akron, CO 80720-1029

A skip-row dryland corn plot at the University of Nebraska's West Central Research and Extension Center in North Platte provided a 32% yield increase over corn planted in 30-inch rows in 2003. The idea behind skip-row planting is to keep developing corn plants from using all of the available water too early in the growing season. Because water in the soil between widely spaced rows can't be reached by the plants until later in the season, there is water available to the plants in July and August. In this trial, all rows of corn were planted and then either plants, or one or two rows were removed on July 2. Corn by this time will have used 6 inches of soil water. Following is a breakdown of the yield results: Control - 19,500 population with 41 bu/ac yield. Removing approximately every third plant, 14,700 population with 41 bu/ac yield. Every other plant removed, 11,200 population with 45 bu/ac yield. Series of two rows of corn followed by one row removed, equivalent to 13,800 population with a 48 bu/ac yield (17% above the control). Series of two rows of corn with the next two rows removed equivalent to 9,500 population with a 54 bu/ac yield (32% above the control). In 2004 and 2005 research trials were conducted at locations across Nebraska (Concord, Lincoln, Clay Center, North Platte, Hayes Center, Ogallala, Sidney, and Scottsbluff) and Tribune, KS and Akron, CO. The treatments consisted of three corn populations and four skip-row configurations. The skip-row configurations are: no skip rows (control), a skip row every two planted rows, a skip row alternating with a planted row (single-skip), and two skip rows alternating with two planted rows (double-skip). There was no irrigation except at Scottsbluff where a reduced irrigation trial was compared to a non-irrigated.

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