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John D. Lea-Cox, Cindy Zhao, David S. Ross, Theodore E. Bilderback, J. Roger Harris, Susan D. Day, Chuanxue Hong, Thomas H. Yeager, Richard C. Beeson Jr, William L. Bauerle, Andrew G. Ristvey, Mary Lorscheider, Sarah Dickinson, and John M. Ruter

instructional design ( Lea-Cox et al., 2002 ) because often the learner does not have the benefit of understanding the context of information that can be more easily communicated in a face-to-face environment. For this reason, each module has stated learner

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John M. Halstead, Walden R. Kerns, and P. Diane Relf

Public concern over the impacts of pesticides and fertilizers on ground water quality has been increasing. Health impacts from ingestion of these chemicals in ground water vary considerably. Recent estimates of the volume of pesticides used in the U.S. indicate that home and garden uses account for about six to eight percent of total pesticides used. To obtain information on types and application rates of home garden chemical use, a telephone survey of Virginia homeowners was undertaken in the summer of 1988. Information was obtained on: 1) size of respondents' lawns and gardens; 2) use of a professional service to manage the lawn or garden, 3) what chemicals were applied and frequency; 4) sources of information used in making chemical use decisions; 5) use of product label instructions and difficulty in interpreting instructions; and 6) perceived threat to water quality, human health, or ground water from properly used home and garden chemicals.

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Wade Bitner, Jerry Goodspeed, Dan Drost, and Rick McDaniel

Conducting varietal evaluations for the home vegetable garden are time-consuming, labor-intensive, and costly. As a result, most are done on an observational basis only. In 1991, a horticultural training program modeled after the highly successful Master Gardener program began at the Utah State Prison, Draper, for the prison inmate population. In 1994, 12 broccoli, 20 pepper, and 30 tomato varieties commonly used in the home garden were evaluated for growth and yield at the Prison Farm. Inmates raised, tended, harvested, and compiled the trial's data and participated in all evaluations of the varieties. Extension personnel provided the instruction and regular visits to conduct the trial. The project provides instruction on vegetable production and cultivar evaluations to the inmates while providing the public with needed cultivar information for the home garden. In addition, the partnership with the inmate population limits the time inputs necessary to conduct the trials by extension staff. This project will continue and greatly expand in 1995.

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David N. Sasseville and J. Leone Herring

According to the Missouri Mastery Achievement Tests, elementary students in Missouri have a need for strengthening basic sciences and mathematics in their curriculum. Areas in the plant sciences such as seed germination and plant growth are among subjects needing particular emphasis. A pilot enrichment program was developed to address this need. Lesson plans were developed which paralleled topics in the Core Competencies and Key Skills for Missouri Schools and targeted for third grade students. The lesson plans were field tested in public and private schools for three years to evaluate lesson plans, equipment, handouts, and other instructional materials. The materials currently include three units: soil, water and plants. The materials are adaptable to all types of organized youth activities and are the primary materials used in Missouri for 4-H plant and soil science programs. Instructional materials have also been developed on how to implement the use of these tools by youth leaders and Extension personnel.

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Douglas A. Hopper

One should choose the simplest form of a model as a tool that adequately represents the processes and relationships of interest. ROSESIM was first developed in SLAM II and FORTRAN to run on a mainframe computer, where it had few users and it was cumbersome to learn and use. As use of models on a personal computer (PC) has become more popular for instruction and simulation, ROSESIM was translated first into the American Standard Code for Information Interchange (ASCII) to run in the Beginner's All-purpose Symbolic Instruction Code (BASIC) language in the popular Microsoft Disk Operating System (MS-DOS). As graphical user interface (GUI) Windows applications have gained increased popularity, ROSESIM has been translated into C++ as object-oriented programming (OOP) to run inside Microsoft Windows 3.1. This makes ROSESIM for Windows readily available to virtually every PC user. Features of ROSESIM for Windows are listed and discussed.

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John F. Vanderploeg

Computer assisted plant selection coupled with video disc technology allows students with limited experience in plant identification and selection to successfully complete landscape design plans.

The plant selector and video disc components have been integrated into a C.A.D. program producing a complete work station. Students preparing computer generated designs can refer to both the selector and video disc without leaving the C.A.D. environment. This integration has proven to be an effective teaching tool in landscape design instruction.

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John T. Harrington and Patrick A. Glass

MACRONUT, a software program for microcomputers, calculates mixing rates of 17 commonly used nutrient sources of six mineral macronutrients for custom-mixed fertilizers. The software alleviates the need for the cumbersome calculations required to develop or adjust custom mixed fertilizers. The software can be used by field professionals and as an instructional tool for teaching horticultural students how to develop custom fertilizers for container nursery crops.

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B.W. Roberts and C.W. O'Hern

Solid particles in water such as sand, silt, clay, or organic debris can clog drip irrigation systems. Filters that remove these particles from the water are necessary, but expensive, for small-scale or part-time farmers. A falter that is functionally similar to commercial units can be built from a steel barrel and common plumbing supplies for about $100. Components and instructions to build such a falter are presented here.

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Richard Durham

Computer-aided instruction is becoming ever-more popular in higher education. The visual nature of horticultural instruction makes it particularly amenable to teaching with computer-based graphic and hypertext formats. The Texas Tech Horticulture Faculty is interested in developing multimedia materials for instruction. Thus far, attention has been directed mainly at courses in introductory horticulture and plant propagation. For the plant propagation course, one activity is the construction of a hypertext glossary in the area of asexual propagation. Topics included in the glossary include propagation by cutting, layering, budding, grafting, and micropropagation. Multiple-choice exams are also available in the module so that students can assess their understanding of the subject matter presented. The glossary is not meant to replace lecture attendance, rather students will be encouraged to access the material outside of class to supplement lecture material. The student is presented a narrative with hot-text links that when activated, pull up additional information with a combination of text and graphics. Alternatively, students can access the same information from a hierarchical topic menu. Plant propagation instructors may also benefit from the glossary's ready supply of visuals that can be down-loaded and used in a traditional classroom format.

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Alice Spurlin Waegel

1 Professor. This study was made possible with the assistance of Sherry Kitto, who provided facilities, instruction, and encouragement during my sabbatical leave at the Plant and Soil Sciences Dept., College of