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Using GPS-RTK In Crop Variety And Hybrid Evaluations
1R. N. Klein, 2J. A. Golus
1. University of Nebraska West Central Research and Extension Center
2. University of Nebraska West Central Research and Extension Center, North Platte, NE

The traditional methods used by many to conduct research in crop variety and hybrid evaluations is to blank plant the area, flag the area, or use a physical marker. All of these have disadvantages. In blank planting it may be difficult to plant exactly in the same rows, and can dry the soil and affect seed germination if soil water is limited. Blank planting also destroys crop residues and with skip-row residues are destroyed in the unplanted rows.This method is used for many plots in cooperator’s fields. Plot rows must match the producer’s rows for pesticide application, cultivation, ditching, irrigation, fertilization, and any other operations performed in the fields. Since the producer blank-plants the plot area we have to wait for the producer to plant in the field. Flagging the area takes considerable time and flags may be difficult to see unless they are large which can be affected by the wind. Large tape measures are difficult to use in the wind and in no-till can catch on the crop residue. The physical marker can plant weed seeds and can be difficult to follow. Most of these systems have a problem with guess rows. Uneven spacing between rows decreases the accuracy of the research, especially in rainfed systems. GPS-RTK auto steering can plant crops with near perfect guess rows, which increases accuracy in the plot. It also greatly reduces the possibility of cultivation blight. With small grain plots, a great amount of time is saved using GPS-RTK in laying out and flagging the plots. Auto steer greatly increases the accuracy of guess row width, making harvesting much easier and more accurate. Auto Steering with GPS-RTK addresses some of the short comings of traditional methods in establishing research plots.