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Driving Accuracy for Strip Tillage in Oklahoma
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2008 Providence, Rhode Island, June 29 – July 2, 2008 083546.
Authors: Randal K Taylor, Rick Kochenower, D Brian Arnall, Chad Godsey, John Solie
Keywords: RTK GPS, automatic steering, precision agriculture
Success of a strip tillage system depends on the ability to plant within the tilled strip where the fertilizer was placed. However, little is know about the driving accuracy needed to achieve maximum yield for strip till crops in the southern Great Plains. An experiment was conducted to determine the effect of driving accuracy on corn and grain sorghum yield in a strip tillage system. Irrigated corn plots were established in two locations (Goodwell and Stillwater, OK) and dryland grain sorghum was grown near Stillwater, OK. An RTK guidance system was used to establish a base path during strip tillage and to create consistent driving errors during planting by using the shift track feature. Nitrogen fertilizer was applied during strip tillage at a rate sufficient to obtain maximum yield for each crop and location. A randomized complete block design was used with four levels of driving accuracy (0, 2, 4, and 6 in) in six replications. Actual driving errors were measured after the crop emerged. Yield was regressed as a function of the measured driving errors. Yield was not affected by driving error for grain sorghum and irrigated corn in Stillwater. Yield was affected (r2=0.15) by driving error for irrigated corn in Goodwell, OK. Based on these results, it appears that highly accurate GPS guidance systems are unnecessary for strip tillage in the southern Great Plains.