Search Results

You are looking at 1 - 3 of 3 items for :

  • Author or Editor: Ellen B. Peffley x
  • HortTechnology x
Clear All Modify Search

Increasingly more collegiate courses are offered through a variety of distance formats. Course management platforms have reduced the faculty time required to create and deliver distance courses while enhancing asynchronous communication. In this study, the transactional distance theory was used to evaluate the different communication levels found between faculty and students in web-facilitated, online, and interactive video courses. A comparison of the online course sections to the web-facilitated course sections determined that there were significantly more asynchronous contacts with the online sections than with the web-facilitated sections. In addition, the total instructor time invested to administer the online course sections was significantly less than for the web-facilitated course sections. The interactive video conferencing sections could not be compared directly to the other teaching modes because the course content differed; however, mean time intervals for teaching and administrative activities are provided.

Full access

A study was conducted to evaluate student performance after receiving the same horticultural lesson through one of two modes of instruction. Students enrolled in an introductory horticulture course received either a traditional herbaceous plant identification (ID) lesson with live plant specimens or the same lesson using only text and photographs on the Internet in one of their laboratory sessions. A follow-up experiment was conducted in which web-based students studied photographs of the exact same plants studied by students receiving traditional instruction. Learning style preferences and demographic information were obtained from surveys. For both experiments, students receiving traditional instruction had higher scores on the plant ID quiz than web-based students. All students were able to identify plants from photographs just as well as from live plant specimens. Visual learners scored higher when receiving traditional instruction when compared with web-based instruction. Student grade point average was positively correlated with quiz score for both experiments.

Full access

Because of potential benefits on human health, the content of quercetin, the major flavonol found in onion (Allium cepa), could become a selection trait in breeding programs. Total flavonol concentration in onion was examined by spectrophotometric analysis at 374 nm in three long-day hybrid cultivars grown at three locations (Parma, Idaho; Grand Rapids, Mich; Elba, N.Y.), and in three shortday hybrid cultivars grown at one location in Georgia in three different fields. Mean total flavonol concentrations for long-day hybrids ranged from 176 to 232 mg·kg-1 (ppm) fresh weight and 110 to 173 mg·kg-1 fresh weight among short-day cultivars. No significant effect of location (state or field) was detected (P > 0.05). A significant (P > 0.05) cultivar by field interaction was detected in the short-day experiment, with the hybrid `Sweet Vidalia' showing significant differences among fields. Overall, our results suggest that quercetin content in onion, as expressed by the total flavonol content, does not vary depending on the growing origin, and therefore could be evaluated effectively in breeding or commercial material.

Full access