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Full-Text Articles in Agriculture
Studies To Characterize Heavy Metal Content And Migration From Recycled Polyethyleneterephthalate, Michael John-Ross Whitt
Studies To Characterize Heavy Metal Content And Migration From Recycled Polyethyleneterephthalate, Michael John-Ross Whitt
Master's Theses
Packaging Materials account for 31% of the world’s municipal solid waste. Agencies like the Environmental Protection Agency (EPA) and the Agency for Toxic Substances and Disease Registry (ATSDR) are pushing for the increased use of recycled thermoplastic materials. Polyethylene terephthalate (PET) is a commonly recycled thermoplastic which is used to package ready-to-eat fruits and vegetables. Most recycled polyethylene terephthalate (RPET) packaging materials contain heavy metal catalysts, the most common being antimony. The recent increased use of recycled plastic materials has been suspected as the source of increased human heavy metal exposure. In this study, cadmium, chromium, nickel, lead and antimony …
Light-Emitting Diodes As An Alternative Supplemental Lighting Source For Greenhouse Tomato Propagation And Production, Celina Gomez Vargas
Light-Emitting Diodes As An Alternative Supplemental Lighting Source For Greenhouse Tomato Propagation And Production, Celina Gomez Vargas
Open Access Dissertations
Intensive year-round local production of greenhouse-grown tomatoes (Solanum lycopersicum L.) requires the use of supplemental lighting (SL) to complement solar radiation in light-limited seasonal climates. However, SL represents a large expense to greenhouse-vegetable production. Currently, energy is second only to labor as the most expensive indirect cost of production. Thus, the greenhouse industry is interested in cost-effective, energy-efficient sources of supplemental photosynthetic light to sustain steady supplies of high-quality produce during the off-season. Overhead (OH) high-pressure sodium (HPS) lamps are considered the industry standard in greenhouse SL because of their capability to deliver adequate photosynthetically active radiation (PAR …
Abcb11 Functions With B1 And B19 To Regulate Rootward Auxin Transport, Jesica Elyse Reemmer
Abcb11 Functions With B1 And B19 To Regulate Rootward Auxin Transport, Jesica Elyse Reemmer
Open Access Theses
Auxin transport is essential for the architecture and development of erect plants. In a network of transporters directing auxin flows, ATP-Binding Cassette (ABC) transporters are a ubiquitous family of proteins that actively transport important substrates, including auxins, across the plasma membrane. ABCB1 and ABCB19 have been shown to account for the majority of rootward auxin transport, but residual fluxes to the root tip in Arabidopsis b1b19 double mutants implies the involvement of at least one additional auxin transporter in this process. Of specific interest, the severe dwarfism seen in abcb1abcb19 is strikingly reminiscent of that seen in mutants defective in …
Supplemental, End-Of-Day, And Sole-Source Lighting From Light-Emitting Diodes Influences Growth, Morphology, And Quality Of Annual Bedding Plant Seedlings, Wesley C. Randall
Supplemental, End-Of-Day, And Sole-Source Lighting From Light-Emitting Diodes Influences Growth, Morphology, And Quality Of Annual Bedding Plant Seedlings, Wesley C. Randall
Open Access Theses
Annual bedding plants make up the largest sector of the U.S. floriculture industry. High-quality annual bedding plant seedlings are compact, fully rooted transplants with a large stem caliper and high root dry mass. However, production usually occurs in late winter or early spring when the daily light integral (DLI) is as low as 1 to 5 mol·m–2·d –1 in northern latitudes. Therefore, supplemental lighting (SL) is often used to increase the DLI to a recommended 10 to 12 mol·m –2·d–1. The objectives of this study were to: 1) quantify the effects of SL from three …
Perceptions Of The Audubon Cooperative Sanctuary Program: A Survey Of Superintendents On University-Affiliated Golf Courses In The U.S., Jacob Joseph Kuban
Perceptions Of The Audubon Cooperative Sanctuary Program: A Survey Of Superintendents On University-Affiliated Golf Courses In The U.S., Jacob Joseph Kuban
Theses and Dissertations
This project assessed U.S. university-affiliated golf courses on their certification level in regards to the Audubon Cooperative Sanctuary Program (ACSP) for golf courses and the amount of college or university student involvement with the certification process. Certification through the ACSP is designed to recognize environmental stewardship and sustainable golf course management practices. A cross-sectional, self-administered online questionnaire was administered to U.S. university golf course superintendents via an online link to the survey in an e-mail message. The population of 120 university golf course superintendents was asked to participate. Data was analyzed using Qualtrics, SPSS, SAS, and Microsoft Excel. Questions were …
Effectiveness Of A Farm Field Trip, Bonnie S. Sigmon
Effectiveness Of A Farm Field Trip, Bonnie S. Sigmon
Theses and Dissertations--Community & Leadership Development
The annual Sigmon Farm Tour was started in 1992 as an agricultural education program where students could experience being on a farm with the goal of increasing the agricultural literacy levels of the participants. Every year the entire 4th grade student population of Rockcastle County spends the day touring the farm and participating in experiential mini lessons given by the cooperating farm service and health agencies. The program has continued for 20+ years without an evaluation as to whether it is achieving its objectives. This evaluation will also exhibit the programs strengths and weakness so it can continue to improve. …