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Fig. 8.6 Worksheet Data for Chapter 8: Practice Problem #1
8.5 End-of-Chapter Practice Problems
1. In a controlled greenhouse experiment, what type of soil conditions are
favorable for the growth of a common flowering species such as Daisy Fleabane
( Erigeron annuus ) often found along roadsides? Suppose that you wanted to
conduct a controlled research study to compare the growth of this flower in three
types of soil treatments, specifically the effects of Nitrogen. Nitrogen is an
essential macro-nutrient necessary for plant development and is commonly
found in fertilizers: (1) Group 1: No nitrogen added to the soil, (2) Group 2:
Low amounts of Nitrogen added to the soil, and (3) Group 3: High amounts of
Nitrogen added to the soil. Your measured variable will be milligrams (mg) of
dry biomass of Erigeron annuus . To do this study, you have obtained soil from
one location of land in the state of Colorado and seeds from a distributor. You
have sterilized the soil so that you could place it in 12 containers for each type of
treatment (i.e., 36 containers in all). Suppose, further, that you planted the same
number of seeds of Erigeron annuus in each container and maintained the
containers in a controlled greenhouse under constant conditions for a growing
season. You then clipped and dried all the Erigeron annuus from each treatment
to obtain dry biomass. You then weighed the dry biomass of each treatment and
generated the hypothetical data given in Fig. 8.6 . Note that there are a different
number of containers in each of the three treatments because some of the plants
did not survive the growing season. To test your Excel skills, you have decided
to run an ANOVA test of the data to determine the growing characteristics of this
plant with respect to varying amounts of Nitrogen.
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