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Long-Term Response of Corn to Limited Irrigation and Crop Rotations
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2007 ASAE Annual Meeting 072282.
Authors: Norman L Klocke, Jose O Payreo, Joel P Schneekloth
Keywords: Limited irrigation, crop rotation, irrigation, deficit irrigation, evapotranspiration, corn, corn yield, soil water
Corn was grown in crop rotations with rainfed, limited irrigation, or full irrigation management from 1985 to 1999. Crop rotations included corn following corn (continuous corn), corn following wheat, followed by soybean (wheat-corn-soybean) or corn following soybean (corn-soybean). Full irrigation was managed to meet crop evapotranspiration requirements (ETc). Limited irrigation was managed with a seasonal target of no more than 150 mm applied. Precipitation patterns influenced the outcomes of measured parameters. Rainfed yields had the most variation, while fully irrigated yields varied the least. Limited irrigated yields were 80-90% of fully irrigated yields, but the limited irrigated plots received about half the applied water. Grain yields were significantly different among irrigation treatments. Yields were not significantly different among rotation treatments for all years and water treatments. For soil water parameters, more statistical differences were detected among the water management treatments than among the crop rotation treatments.