Pretest-Posttest Model The pretest-posttest model is a common technique for capturing change in Extension programming (Allen & Nimon, 2007; Rockwell & Kohn, 1989). In this model, a pretest is given to participants prior to starting the program to measure the variable(s) of interest, the program (or intervention) is implemented, and then a posttest is administered to measure the same variable(s) of interest again (Gall, Gall, & Borg, 2003). With measurements being collected at the beginning and end of the program, program effects are often revealed by calculating the differences between the two measures (Pratt et al., 2000). Many times, this approach is used to conduct actual assessments of knowledge, which moves away from a self-reported construct of knowledge gain (see figure below).
Please circle your answer to each of the following statements.
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1. Soil disturbance decreases organic matter.
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2. The C:N ratio of residue dictates whether N is mineralized or immobilized.
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3. Surface soil acidification occurs more rapidly in conservation tillage than conventional tillage.
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4. Conservation tillage systems increase the diversity of soil organisms. Tru e
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5. Conservation tillage systems always increase soil compaction.
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6. Use of cover crops as a mulching layer conserves soil moisture.
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