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Unformatted text preview: that the Global Positioning System (GPS) became available for public use
Zinc (parts per million)
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
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:
y location in the ﬁeld
location in the ﬁeld 9 9 10 Eg Weibo 10 Eg Weibo 10 10 10 Eg metabolomics 1
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This note was uploaded on 02/06/2014 for the course STAT 503 taught by Professor Staff during the Fall '08 term at Iowa State.
- Fall '08