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Unformatted text preview: (BD), in mm.
The primary question here is “How do we distinguish between species and sex
based on these ﬁve morphological measurements.” 9 Eg Crabs 1
9 9 Eg Soils 9 STAT 503X Case Study 3: Baker Field Data
Description Soils Since the time that the Global Positioning System (GPS) became available for public use
nearly ten years ago, there has been an increased interest in precision farming. The Global
Positioning System allows the agronomist or soil scientist to ascertain her location within a
ﬁeld to a high level of accuracy. This precise measure of location in a ﬁeld, combined with
soil characteristics, yield measurements and other data associated with the location can then
be used to extract valuable information about the complex process of plant growth. This
information collected at multiple locations within a ﬁeld can be used to formulate yieldmaximization strategies such as variable-rate 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: 9 x
location in the ﬁeld
location in the ﬁeld
Corn97BY corn yields in bushells
Boron (parts per million)
Calcium (parts per million)
Copper (parts per million)
Iron (parts per million)
Potassium (parts per million)
Magnesium (parts per million)
Manganese (parts per million)
Description (parts per million)
Phosphorus (parts per million)
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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