No abstract

Differences in eighth graders' self-concept, self-regulatory behavior, and critical thinking ability between two groups—one group using a software package called CSILE (Computer-Supported Intentional Learning Environment) in a constructivist learning environment and one control group—were investigated. Data were gathered over a one-year period using a quasi-experimental pre-posttest nonequivalent control group design. Results indicated that the CSILE group had a higher level of self-regard, improved ability to regulate their behavior and an increased ability to make credible judgments about someone else's assertions than did the control group ( p < 0.05). The findings are consistent with Scardamalia's assertion that CSILE emphasizes critical thinking skills [1]. Additionally, students in the CSILE group were in a student-directed learning environment which improved their self-concept and may have transferred to their ability to manage their behavior.

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Clover is frequently grown in rotation with cereals in order to increase soil nitrogen. The systemic fungicide triadimefon, widely used against cereal pathogens, is readily taken up from soil by clover and degraded to a single major metabolite. Plant weight and symbiotic nitrogen fixation by Rhizobium trijolii are affected only by concentrations of triadimefon in soil that are much in excess of those likely to be encountered in practice. Triadimefon residues are thus unlikely to affect nitrogen fixation by clover under field conditions.