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| Mamo, M.; Ippolito, J.A.; Kettler, T.; McCallister, D.L.; Morner, P.; Husmann, D.; Blankenship, E.. |
| Evolving computer technology offers opportunities for new online approaches in teaching methods and delivery. Well-designed online lessons should reinforce the critical need of the soil science discipline in today’s food, energy, and environmental issues, as well as meet the needs of the diverse clientele with interest in agricultural and/or environmental disciplines. The objectives of the project were to: (1) develop web-based lessons in soil genesis and development; and (2) evaluate an applications-principles model to teach soil science using case studies in agronomic, environmental, and ecological situations. Six principles lessons, along with three applications lessons, were developed for use by undergraduate earth science courses. Pre- and post-tests... |
| Tipo: Article |
Palavras-chave: Soil. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1452/1/1417.pdf |
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| Kyaw, T.; Ferguson, R.B.; Adamchuk, V.I.; Marx, D.B.; Tarkalson, D.D.; McCallister, D.L.. |
| Iron chlorosis can limit crop yield, especially on calcareous soil. Typical management for iron chlorosis includes the use of iron fertilizers or chlorosis tolerant cultivars. Calcareous and non-calcareous soil can be interspersed within fields. If chlorosis-prone areas within fields can be predicted accurately, site-specific use of iron fertilizers and chlorosis-tolerant cultivars might be more profitable than uniform management. In this study, the use of vegetation indices (VI) derived from aerial imagery, on-the-go measurement of soil pH and apparent soil electrical conductivity (ECa) were evaluated for their potential to delineate chlorosis management zones. The study was conducted at six sites in 2004 and 2005. There was a significant statistical... |
| Tipo: Article |
Palavras-chave: Calcareous soil; Fertilizer. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1275/1/1251.pdf |
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