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Unformatted text preview: that the Global Positioning System (GPS) became available for public use Zinc (parts per million) Since the The corn was harvested on been an increased interest in precision farming. on May 22nearly ten years ago, there has October 6, 1997 and the soil samples were taken The Global 23, 1997. The soil samples consisted of 6 cores, 1 inch in diameter and collected to a withinof Positioning System allows the agronomist or soil scientist to ascertain her location depth a 8 inches. Samples wereaccuracy. This precise measure of location in a the various nutrients field to a high level of air dried, ground, extracted, and analyzed for field, combined with using inductively-coupled plasma (ICP)and other data associated with the location can then soil characteristics, yield measurements techniques (Karlen and Colvin, 1998). Because soil nutrient to extract valuable information the sites, only 215 of the sites plant growth.inThis the be used data were not available at 9 of about the complex process of are included STAT 503X Case Study 3: Baker Field Data information collected at multiple locations within a field can be used to formulate yieldmaximization strategies such as variable-rate 1 fertilizer, herbicide or pesticide application. The data to be analyzed in this study was drawn from part of a privately owned farm in southeastern Boone County, Iowa Colvin, Jaynes, Karlen, Laird & Ambuel (1997). A total of 224 sites within an approximately 350 m × 350 m portion of the field were studied. The sites are located along 8 equally-spaced east-west transects. Along each transect there are 28 sites, spaced approximately 12.2 m apart. At harvest time, a combine is driven down each transect, stopping every 12.2 m to measure yield in bushels/acre (Colvin, et. al., 1997). The field of interest has been on a corn-soybean rotation since 1957. The 1997 data set to be discussed contains: x y location in the field location in the field 9 9 10 Eg Weibo 10 Eg Weibo 10 10 10 Eg metabolomics 1 1.1 In...
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