Agricultural Applications in the Neo Erasmio Geothermal Field (Thrace, Northe...Apostolos Arvanitis
Kolios N., Dalabakis P. & Arvanitis A. (2011), “Agricultural Applications in the Neo Erasmio Geothermal Field (Thrace, Northeastern Greece)”, Presentation at the GEOFAR European Conference “Innovative Solutions for Geothermal Energy Financing”, Athens, 17 - 18 March 2011
A fuzzy micro-climate controller for small indoor aeroponics systemsTELKOMNIKA JOURNAL
The Indonesian agricultural sector faces challenges producing affordably priced food using sustainable practices. A soilless cultural practice, such as indoor aeroponics, is a compelling alternative to conventional agriculture. The objective of the present study was to develop a system for micro-climate management in a pilot-scale indoor aeroponics system. For this purpose, three fuzzy logic controllers were developed and evaluated to maintain plant chamber parameters (temperature, relative humidity, and light intensity) at desired set points controlled by embedded system controls designed using BASCOM-AVR software. The results showed that the fuzzy controllers provided excellent responses and experienced relatively low errors in all controlled parameters. All parameters changes followed the set point very smoothly and responded accordingly. The averaged percent of working times in which temperature, relative humidity, and light intensity were maintained within less than ±1°C, ±5%, and ±30 lux from the set points were found to be 88.43%, 95.91%, and 85.51%, respectively.
Agricultural Applications in the Neo Erasmio Geothermal Field (Thrace, Northe...Apostolos Arvanitis
Kolios N., Dalabakis P. & Arvanitis A. (2011), “Agricultural Applications in the Neo Erasmio Geothermal Field (Thrace, Northeastern Greece)”, Presentation at the GEOFAR European Conference “Innovative Solutions for Geothermal Energy Financing”, Athens, 17 - 18 March 2011
A fuzzy micro-climate controller for small indoor aeroponics systemsTELKOMNIKA JOURNAL
The Indonesian agricultural sector faces challenges producing affordably priced food using sustainable practices. A soilless cultural practice, such as indoor aeroponics, is a compelling alternative to conventional agriculture. The objective of the present study was to develop a system for micro-climate management in a pilot-scale indoor aeroponics system. For this purpose, three fuzzy logic controllers were developed and evaluated to maintain plant chamber parameters (temperature, relative humidity, and light intensity) at desired set points controlled by embedded system controls designed using BASCOM-AVR software. The results showed that the fuzzy controllers provided excellent responses and experienced relatively low errors in all controlled parameters. All parameters changes followed the set point very smoothly and responded accordingly. The averaged percent of working times in which temperature, relative humidity, and light intensity were maintained within less than ±1°C, ±5%, and ±30 lux from the set points were found to be 88.43%, 95.91%, and 85.51%, respectively.
Indigo kids is a symphony of phenomenal programs where lots of educational apps are present for making your kid's an indigo kid's.
Get More Information:
http://indigo-kids.ru/
Pv day frankfurt june 2015 zittartz presentationpharmasol
Medical Devices and Pharmaceutical products have long been separate worlds with distinct regulations.
Advances in technology continue to create new opportunities by merging devices with drugs or biologics to provide previously impossible benefits to patients. As these combination products involve components that are normally regulated under different types of regulatory authorities, they raise several challenges to traditional pharmaceutical companies, not previously exposed to Device regulations.
Compared to drug regulations, device regulations are more diverse depending on the classification of the device. But the safety of Medical Devices has recently become the focus of regulatory activities in Europe following the scandal about industrial silicone breast implants in France, leading to changes in regulations that follow pharmacovigilance principles.
In this presentation Dr Marc Zittartz, Chief Quality Officer at pharmasol, provides an overview on drug-device combinations, the recent regulatory developments, and how this affects the traditional pharmacovigilance activities of pharmaceutical companies.
Before we start talking about marketing agencies here is one thing we need to understand is what is marketing. So, for that here are some points which defines marketing.
Indigo kids is a symphony of phenomenal programs where lots of educational apps are present for making your kid's an indigo kid's.
Get More Information:
http://indigo-kids.ru/
Pv day frankfurt june 2015 zittartz presentationpharmasol
Medical Devices and Pharmaceutical products have long been separate worlds with distinct regulations.
Advances in technology continue to create new opportunities by merging devices with drugs or biologics to provide previously impossible benefits to patients. As these combination products involve components that are normally regulated under different types of regulatory authorities, they raise several challenges to traditional pharmaceutical companies, not previously exposed to Device regulations.
Compared to drug regulations, device regulations are more diverse depending on the classification of the device. But the safety of Medical Devices has recently become the focus of regulatory activities in Europe following the scandal about industrial silicone breast implants in France, leading to changes in regulations that follow pharmacovigilance principles.
In this presentation Dr Marc Zittartz, Chief Quality Officer at pharmasol, provides an overview on drug-device combinations, the recent regulatory developments, and how this affects the traditional pharmacovigilance activities of pharmaceutical companies.
Before we start talking about marketing agencies here is one thing we need to understand is what is marketing. So, for that here are some points which defines marketing.
Biochar Summit Ormoc City, Leyte, Philippines (in November 2018)Christer Soderberg
Presentation of Biochar as a vehicle for soil enrichment and carbon sequestration organised by Mayor Richard Goma Gomez, and Congresswoman Lucy Torres-Gomez, with the invaluable help of their teams and Cristine Hontanosas, who all helped make my stay in the Philipines an unforgettable experience.
Before and after the summit, test trials were carried out with the Ithaca Institute designed "Kon-Tiki" kiln, and a local team of "Char Masters" defined to spread knowledge and experience by promoting the application of biochar to soils for increased fertility, production and quality of organic agricultural produce.
More information at: www.circlecarbon.com
and on Facebook: www.facebook.com/circlecarbonlabs
There is also a Youtube video from the presentation, for those interested:
https://www.youtube.com/watch?v=_2I67QKgFLQ&fbclid=IwAR1N861aJvn5q4WX5bkXmSYuCW7Cw2U8z-BjkvHyK2FIJ_Q55bGycKWbxh4
Generation of Syngas using Anacardium Occidentaleijtsrd
The purpose of this project is to produce syngas from Anacardium occidentale shell which can be used in the piston engine of a short range helicopters like Mosquito XEL etc. which can be used for various applications like for agriculture fertilization and for local transport in an affordable price to the civilians. This anacardium occidentale is also known as cashew nut in most of the region. This project states the production of the syngas through downdraft gasification process as it is proven that it produces very less tar waste compared to other gasifiers. In this project, we will be also reusing the biomass char by converting it into an active catalyst which can be used for various applications like bio diesel production and in pyrolysis process to boost up the chemical reactions. This project also involves the waste management as we are running out of renewable resources of fuel such as fossil fuels which are obtained from the earth. In this project, we will be able to make use of such a fuel in the aviation industry which is obtained from a waste of a phytomass. In this project, we will be focusing on the production of this fuel from anacardium occidentale shells and study its characteristics by distinguishing with other phytomasses. T. Ayyasamy "Generation of Syngas using Anacardium Occidentale" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd42604.pdf Paper URL: https://www.ijtsrd.comengineering/electrical-engineering/42604/generation-of-syngas-using-anacardium-occidentale/t-ayyasamy
Impact of Improved Aeration on Decomposition Rate of Enriched Compostijtsrd
Agricultural activities tend to generate a substantial volume of animal and crop residues. Composting is the most economical and ecologically sustainable option to manage farmyard waste. However, it takes approximately three months to complete decomposition and contains lower plant nutrient percentages than inorganic fertilisers. This study aimed to reduce the decomposition time and improve the nutrient content of compost. Aerobic decomposition was enhanced by aeration inside the pile using a blower with 0.5 l min kg airflow. Paddy straw, poultry manure, goat manure, cattle manure and paddy husk ash were mixed in 3 1 1 1 1 ratio respectively as the raw materials and 3 of Eppawala Rock Phosphate was added to the mixture in weight basis. Six piles 150 X 100 X 80 cm were prepared, and three piles were aerated for six hours per day while other three piles were left to decompose under the ambient condition as the control. According to the results, aerated and control piles took 35 days and 65 days to complete the decomposition. Total N, available P, exchangeable K, C N ratio, pH, EC and CEC were analysed in compost samples from aerated after 35 days and controls, and the results were, 20.5 g kg 1, 1.8 g kg 1, 10.4 g kg 1, 7, 8.8, 4.3 mS cm 1, 19.3 cmol kg 1 and 17.8 g kg 1, 1.5 g kg 1, 9.9 g kg 1, 8.5, 8.8, 3.64 mS cm 1, 21.3 cmol kg 1 respectively. Data were analysed using SAS 9.0 software with a 95 confidence interval. The results revealed a significant increment in total N, exchangeable K, C N ratio, EC and CEC in aerated piles compared to controls. And the nutrient composition of both methods was significantly higher than the commercial compost. Therefore, it can be concluded that decomposition time can be effectively reduced and the nutrient level can be increased by artificial aeration and nutrient enrichment, respectively. However, further studies are recommended to study the economic feasibility. D. M. S. H. Dissanayaka | V. P. T. Dhananjaya | E. J. Kosgollegedara | S. Karthigayini "Impact of Improved Aeration on Decomposition Rate of Enriched Compost" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-2 , February 2021, URL: https://www.ijtsrd.com/papers/ijtsrd38557.pdf Paper Url: https://www.ijtsrd.com/engineering/agricultural-engineering/38557/impact-of-improved-aeration-on-decomposition-rate-of-enriched-compost/d-m-s-h-dissanayaka
Birmingham Energy Institute - Fraunhofer UMSICHT CollaborationGavin Harper
The Birmingham Energy Institute and Fraunhofer UMSICHT are combining academic expertise with industrial capability to develop a Joint Research Platform that will deliver new approaches to energy and waste management with the beneficiaries being cities and communities. As such, this new collaboration will address the practical challenges that sit at the heart of the energy waste nexus, applying academic insight to accelerate innovation to the market place.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
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It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdf
Compost Heated Greenhouses
1. The ATTRA Project is operated by the National Center
for Appropriate Technology, under a grant from the USDA’s
Rural Business-Cooperative Service.
www.attra.org
In a composting greenhouse, heat and carbon dioxide are generated from a manure-based
compost contained in a special chamber attached to one side of the greenhouse. In-vessel
compost units or compost windrows—located in a nearby but separate location—are an
alternative to attached compost chambers. In either case, capturing the heat of combustion and
distributing it to the greenhouse itself is a design feature that needs attention.
Options include wrapping the compost chamber with recirculating water pipes, or using an air-
to-water heat exchanger. The heated water is then available for distribution through radiant
heating. Since root-zone heating—hydronic tubing used with floor and bench heating—is an
established practice in the greenhouse industry, the technology already exists to integrate this
source of heat.
As with any compost site, equipment access is a basic requirement to facilitate the movement of
vehicles, tractors, and bucket loaders. Large-scale composting relies on efficient handling and
mixing of raw feedstocks such as manures, straw, and green waste.
Root-zone heating systems work well with any low-temperature (90–110° F.) water system,
including compost-heated, solar-heated, and geothermal-heated water, as well as warm waste
water from power plants and co-generation facilities. A separate greenhouse resource packet
on root-zone heating is available from ATTRA.
Composting Greenhouses at the New Alchemy Institute
Heating greenhouses with waste heat generated by thermophilic compost is an idea that gained
a lot of attention in the 1980s. The best known example was the composting greenhouse project
initiated in 1983 at the New Alchemy Institute (NAI) in Massachussetts, which began with a
700-square-foot prototype.
The New Alchemy Institute was one of the premier alternative technology centers in the 1970s
and 80s. The Institute published widely on appropriate technology, ecology, solar energy,
bioshelters, solar greenhouses, integrated pest management in greenhouses, organic farming,
and sustainable agriculture.
From the mid- to late 80s, NAI published a number of research reports and magazine articles
about its ongoing work with composting greenhouses. Enclosed is the complete set of four
articles published on this topic in New Alchemy Quarterly between 1983 and 1989. These articles
contain blueprints, illustrations, photographs, and descriptions of the composting greenhouse.
Of special note are the seven conclusions reached by the greenhouse team in the 1987 article,
plus the new findings reported in the 1989 article.
800-346-9140
AppropriateTechnologyTransferforRuralAreas
COMPOST HEATED GREENHOUSES
By Steve Diver
NCAT Agriculture Specialist
January 2001
CURRENT TOPIC
2. 2
By 1987, NAI had identified significant problems with the concept. These include (1):
• The composting greenhouse is a risky and experimental technology. Its should only be
considered in situations where each operation—greenhouse and composting—makes sense
in its own right.
• Composting is a challenge, since it is both art and science. The small operation may not be
able to afford specialized composting equipment, resulting in substantially increased labor
requirements.
• The composting component needs to be sized on the basis of its carbon dioxide production.
If the composting component is sized to heat the greenhouse—in a mild climate like
southern New England, half a cubic yard of compost per square foot of greenhouse(!)—the
amount of carbon dioxide generated will be six times that needed for optimal CO2-enriched
atmospheres, and the amount of nitrogen (ammonia) released will be fifty times that needed
for optimal plant growth.
• When the composting component is sized on the basis of carbon dioxide, the heat generated
will be supplementary only, meeting perhaps 15% of the energy needs. Excess nitrogen will
still, however, be a troublesome contaminant of the system, at levels roughly eight times
greater than optimal. Nitrate levels are consistently too high for safe production of cool
season greens, due to accumulation of nitrates in the vegetables.
However, in the 1989 article, NAI cited new design features that promised to solve the
ammonia problem. And nitrates are not a problem when greenhouses are only used to start
vegetable seedlings intended for field production.
In addition to the articles in New Alchemy Quarterly, NAI published research reports and
working papers on this topic. Although the Institute ceased operations in 1991, NAI
publications are available through The Green Center, a non-profit educational institute located
at the site of the former Institute. Some of the NAI reports are on the Green Center web page,
and copies of other publications are available for sale. For a complete list of publications and
prices, contact:
The Green Center
237 Hatchville Rd.
East Falmouth, MA 02536
508-540-2408.
<www.fuzzylu.com/greencenter/home.htm>
The Green Center—Online Research Reports on Greenhouse Topics:
No. 1: Biothermal Energy: Cogenerants of Thermophylic Composting and their Integration
within Food Producing and Waste Recycling Systems. By Bruce Fulford. Reprinted from
Proceedings of the First International Conference on the Composting of Solid Wastes
and Slurries, Leeds, England, September 28–30, 1983.
<www.fuzzylu.com/greencenter/rr/rr001.htm>
3. 3
No. 3: The Composting Greenhouse at New Alchemy Institute: A Report on Two Years of
Operation and Monitoring (March 1984–January 1986). By Bruce Fulford, BioThermal
Associates, November 1986
<www.fuzzylu.com/greencenter/rr/rr003.htm>
No. 5: The Potential for Food-Producing Greenhouses in the Northeast
<www.fuzzylu.com/greencenter/rr/rr005.htm>
The Green Center—Working Papers on greenhouse topics, available in print:
No. 4: Economics: Hydroponics vs. Composting Greenhouses
No. 16: Composting Greenhouse: Thermal Performance
No. 19: Nitrogen Dynamics in Composting Greenhouse
No. 29: Improved Composting Greenhouse Designs
Other Research
Beyond the New Alchemy studies, little scientific research has been done with composting
greenhouses. However, a study published in 1997 stated that cattle manure mixed with rice
hulls was successful in producing winter crops (2). The compost raised the underground
temperature between 20 and 35°F. The final compost was of good quality, with good nutrient
content.
A 1995 study compared compost to manured soil for greenhouse cucumber production (3).
There were several significant results: the composts maintained a higher temperature in the root
zone, a higher carbon dioxide level, and a higher microbial level than the manured soil. Nitrate
concentration was also considerably lower in the compost-produced cucumbers. Fruit
production on the composts started 10–12 days earlier and the composts had significantly
higher yields.
Quality of Compost
The operation of a compost-greenhouse facility has two inherent goals: (1) heating the
greenhouse via co-generation from a compost chamber, and (2) the production of compost.
Thus, compost end use (e.g., greenhouse production, potting mix, landscape industry, bagged
sales) and compost quality should both weigh in the decision-making process.
Good quality compost is recognized as a valuable soil treatment that performs multiple
functions in terms of soil structure, crop fertility, the soil foodweb, natural disease suppression,
etc. Thus, attention to the composting process itself is rather important, and this means that
good aerobic conditions—normally achieved by turning the pile when windrows are used or
through forced air when aerated static piles are used—are critical.
Compost quality can be significantly improved by monitoring the pile for temperature, carbon
dioxide, pH, nitrites, nitrates, and sulfur, and through the use of microbial inoculants. Compost
biomaturity is determined through a series of tests that indicate the levels of temperature,
humus, and biological activity.
4. 4
Related information available from ATTRA includes the publications Farm-Scale Composting,
Compost Teas for Plant Disease Control, Biodynamic Farming and Compost Preparation, Organic
Potting Mixes, and Disease-Suppressive Potting Mixes. All of these publications are available in
print as well as on the ATTRA web page at <www.attra.org>. In addition, compost-related
items on my home page include:
Controlled Microbial Compost and Humus Management (Luebke Compost)
<http://ncatark.uark.edu/~steved/cmc-compost.html>
Compost Quality Standards
<http://ncatark.uark.edu/~steved/compost-standards.html>
Clay-Humus: The Seat of Soil Fertility: A Treatise on the Vital Role of Clay-Humus
Crumb Structure and Organo-Mineral Complexes in Soils
<http://ncatark.uark.edu/~steved/clay-humus.html>
References:
1) Fulford, Bruce. 1986. Composting Greenhouse at New Alchemy Institute: A Report on
Two Years of Operation and Monitoring. Research Report No. 3, New Alchemy
Institute.
2) Hong, J.H., K.J. Park, and B.K. Sohn. 1997. Effect of composting heat from intermittent
aerated static pile on the elevation of underground temperature. Applied Engineering
in Agriculture. September. p. 679–683. (Abstract.)
3) Kostov, O., Y. Tzvetkov, N. Kaloianova, and O. van Cleemput. 1995. Cucumber
cultivation on some wastes during their aerobic composting. Bioresource Technology.
Vol. 53, No. 3. p. 237–242. (Abstract.)
Enclosures:
Anon. 1991. Compost preheats water. Biocycle. July. p. 20.
Foulds, Chantal. 1992. Reducing costs, improving nutrient value. Sustainable Farming.
Winter. p. 6–8.
Fulford, Bruce. 1983. The composting greenhouse for commercial regenerative agriculture.
New Alchemy Quarterly. Winter/Number 14. p. 4–5.
Fulford, Bruce. 1985. The compost story heats up. New Alchemy Quarterly. Spring/Number
19. p. 19–20.
5. 5
Enclosures: continued
Fulford, Bruce. 1988. Composting in greenhouses for heat, CO2 enrichment, and nutrient
economy. p. 337–346. In: Patricia Allen and Debra Van Dusen (ed.) Global Perspectives on
Agroecology and Sustainable Agricultural Systems. Agroecology Program, University of
California, Santa Cruz.
Marshall, Norm. 1987. Composting greenhouse design update. New Alchemy Quarterly.
Fall/Number 29. p. 6–8.
Schonbeck, Mark. 1989. Composting greenhouse update. New Alchemy Quarterly.
Summer/Number 36. p. 16–17.
Further Reading:
Compost Heating in Greenhouses:
Anon. 1986. Heat with compost. Greenhouse Grower. Vol. 4, No. 12. p. 50.
Root-Zone Heating in Greenhouses:
Roberts, Bill. 1991. Soil heating improves transplant production. American Vegetable Grower.
November. p. 40–42.
Solar-Floor Heating in Greenhouses:
Roberts, W.J. et al. 1985. Energy Conservation for Commercial Greenhouses. NRAES-3.
Northeast Regional Agricultural Engineering Service, Cornell University. p. 27–30.
Whitcomb, Carl E., Charlie Gray, and Billy Cavanaugh. 1984. The "ideal" greenhouse for
propagation. p. 4–8. In: Nursery Research Field Day. Research Report P-855. Agricultural
Experiment Station, Oklahoma State University.
Whitcomb, Carl E., Charlie Gray, and Billy Cavanaugh. 1985. A floor heating top ventilating
system for quonset greenhouses. p. 4–10. In: Nursery Research Field Day. Research Report P-
872. Agricultural Experiment Station, Oklahoma State University.
The ATTRA Project is operated by the National Center for Appropriate Technology under a grant from the Rural Business-
Cooperative Service, U.S. Department of Agriculture. These organizations do not recommend or endorse products, companies, or
individuals.