Monday, June 18, 2007 - 10:40 AM

Can Drought Tolerance of Rainfed Corn be Improved Using a Skipped Row Planting Strategy.

Robert Klein1, Drew Lyon1, David Baltensperger2, Alexander Pavlista1, Charles Shapiro1, Stevan Knezevic1, Stephen Mason1, Lenis Nelson1, Mark Bernards1, Roger Elmore3, Alan Schlegel4, and Merle Vigil5. (1) University of Nebraska, West Central Researh & Extension Center, 461 West University Drive, North Platte, NE 69101, (2) Texas A&M University, Department of Soil and Crop Sciences, College Station, 77843-2474, (3) Iowa State University, 2104 Agronomy Hall, Ames, IA 50011, (4) Kansas State University, Southwest Res. Ext. Center, Rt. 1 Box 148, Tribune, KS 67879, (5) USDA, Central Plains Resources Management Research, Akron, CO 80720

With the highly variable precipitation in the Great Plains, improving the probabilities of having soil water available during the critical silking to blister stage of corn development will improve the chances of success of rainfed corn production. The idea behind skip-row planting is to keep developing corn plants from using all of the available soil water early in the growing season for vegetative growth. In 2003, we started research with skip-row corn. In this trial, all rows of corn were planted and then plants were removed to reduce population, or one or two rows were removed on July 2. Corn plants at this stage will have used 6 inches of soil water. The yield was increased by 17% using a planting pattern in which one row was removed in three (plant 2 skip 1) and 32% where two rows were removed in for rows (plant 2 skip 2). In 2004 and 2005, rainfed research trials were conducted at several locations across Nebraska [Concord, Lincoln, Clay Center (also 2006), North Platte  (2006), Trenton (2006), Hayes Center, Ogallala (2006), Sidney, Alliance, and Scottsbluff (also limited irrigation)] and Tribune, KS (also 2006) and Akron, CO  ( 2006). The treatments consisted of three corn populations and four skip-row configurations. In 2006 at Clay Center over all populations a "plant 2 skip 1" yielded 174 bu/ac vs solid 155 bu/ac while at Trenton over three population and three skip-row configurations, the skip row yielded 117 bu/ac vs solid 113 bu/ac while at North Platte the skipped rows yielded 113 bu/ac vs solid 118 bu/ac. In 2006, a farmer at Chappell planted 14,000 seeds/acre solid with a yield of 37 bu/ac and 10,000 seeds/acre in a plant 2 skip 2 (20,000 in the 2 planted rows) with a yield of 57 bu/ac.