Grow Boss Prove Me Wrong Challenge. temp and humidity Challenge accepted ! Nadia Sabeh An Engineer

Grow Boss Prove Me Wrong Challenge. temp and humidity Challenge accepted !! Nadia Sabeh PhD, PE, LEED AP President at Dr. Greenhouse, Inc. About …


  1. Yeah it grows all over the world but it grows differently. If it was all different humidities and all the weed came out the exact same then yeah he would have a point. Does he not understand were trying to replicate best case scenarios and prime environmental factors and not just any environment that weed will grow in?

  2. References

    ASHRAE Handbook Fundamentals. 1993. American Society of Heating, Refrigerating and Air Conditioning Engineers, Atlanta, GA.

    ASAE Fundamentals. EP406.2 American Society of Agricultural Engineering, St. Joseph, MI.

    Bailey, B.J. 1995. Greenhouse climate control—new challenges. Acta Horticulturae No. 399 p. 13-23.

    Bakker, J.C. et al. (Eds.) Greenhouse Climate Control—an integrated approach. Wageningen, NL: Wageningen Pers. 1995.

    Elad, Y. Malathrakis, N.E. and A.J. Dik. 1996. Biological control of Botrytis-incited diseases and powdery mildews in greenhouse crops. Crop Protection. 15(3):229-238.

    Grange, R.I. and D.W. Hand. 1987. A review of the effects of atmospheric humidity on the growth of horticultural crops. J. Horticultural Science. 62(2):125-134.

    Nokes, S.E. 1995. Evapotranspiration. Environmental Hydrology: Editor, A.D. Ward and W.J. Elliot. CRC Press LLC, Boca Raton, Florida. pp 91-132.

    Papadopoulous, A.P., Pararajasingham, S., J.L. Shipp, W.R. Jarvis, and T.J. Jewett. 1997. “Integrated Management of Greenhouse Vegetable Crops.” Horticultural Review. 21: 1-39.

    Prenger, J.J. and P.P. Ling. 2000. “Greenhouse Condensation Control.” Fact Sheet (Series) AEX-800. Ohio State University Extension, Columbus, OH.

    Strobel, B.R. and R.R. Stowell. 1999. “Using a Psychrometric Chart to Describe Air Properties.” Fact Sheet AEX-120-99. Ohio State University Extension, Columbus, OH.

    U.S. Daily Light Integral Map by Joanne Logan and James Faust

    Daily Light Integral (DLI) maps display the ambient light delivered daily during each month across the entire U.S. These maps were researched and developed by James Faust of Clemson University and Joanne Logan of The University of Tennessee.

    What is Vapor Pressure Deficit (VPD)?

    Vapor pressure deficit (VPD) is the primary driver of evapotranspiration inside the indoor plant environment. VPD is

    ​a measure of the amount of water in the air versus the maximum about of water the air can hold at a given temperature (the saturated condition). VPD is measured in units of pressure, typically in kilopascals (kPa), but may also be reported as bars, milibars, inches of Hg, or other pressure units.

    In general, a low VPD means the air is "humid" and a high VPD indicates the air is "dry." VPD is directly responsible for the stomatal opening of plant leaves. If VPD is too high ("dry" air), stomata will close to conserve water. If the VPD is too low ("humid" air), stomata may be fully open, but evapotranspiration will be slow since the difference in water vapor in the air versus at the leaf is very small. Both conditions can cause leaf wilting, leaf tip burn, and other crop maladies, including susceptibility to pests and molds. On the other hand, when VPD is managed correctly, plants will transpire freely, moving nutrients readily to cells and maximizing CO2 uptake and photosynthesis.

    The correct VPD level depends on the type of crop, as well as the stage of crop for fruiting and flowering plants.

  3. Grow Boss Prove Me Wrong Challenge. temp and humidity Challenge accepted !!

    Nadia Sabeh PhD, PE, LEED AP President at Dr. Greenhouse, Inc. About

    Energy Efficiency Measures for Indoor Agriculture

    For over 20 years, Dr. Sabeh has dedicated her education and career to helping farmers control their environments, allowing them to grow crops indoors, in greenhouses and in facilities that would otherwise be impossible or impractical to do so. She and her team have designed HVAC systems for facilities growing leafy greens, strawberries, cannabis, and vine crops all over the world.

    I am the President and Founder of Dr. Greenhouse, Inc., a Mechanical and Agricultural Engineering Consulting firm that specializes in the HVAC and climate management design for indoor plant environments, including vertical farms, container farms, and, of course, greenhouses. We are plant-driven and crop-agnostic; if you want to grow it indoors, we want to help you create the optimal environment for growth.

    As a Mechanical and Agricultural Engineer, I have a deep understanding of plant environment relationships, including the effects of light, temperature, humidity, and nutrient levels on plant responses. These parameters, along with the operational needs and procedures of the farm, influence and inform our recommendations for the selection, design, and control of the HVAC system.

    One day, I hope to have the opportunity to integrate agriculture into buildings, where I get to design and engineer a system that recycles waste streams between the human and plant environments as inputs to the other.

    In my former positions, I was the lead mechanical engineer on projects for Guide Dogs for the Blind and the Dumb Friends' League of Denver; affordable housing projects for First Community Housing and Eden Housing in the East Bay; and the UC Davis Memorial Union Renovation project, which as an alum, was a personal thrill.


    -Controlled Environment Agriculture (CEA): HVAC design and energy/water efficiency for greenhouses and vertical farms (vegetables, mushrooms, etc).

    -HVAC design: Small animal facilities, Multi-family housing, Mechanical Retrofits

    -Building energy modeling (design assist, Title 24, LEED EAp2/c1)

    -LEED Project Management

    -Teaching, advising, and mentoring students and young professionals

    – Ability to explain complex concepts simply


    University of Arizona Controlled Environment Agriculture Center Agricultural and Biosystems Engineering Dept Dept. of Plant Sciences

    University of California at Davis Department of Biological and Agricultural Engineering Department of Plant Sciences:

    ​Michigan State University Department of Horticulture National Greenhouse Manufacturers Association (NGMA) Helpful Hints and Guidelines Upstart University HortAmericas, LLC

    —–Greenhouse Designer —

    CannaPro / George Dickinson


    Olympia Steel Buildings

    Paul Boers Manufacturing

    Universal Fabrication


    Cannabis Cultivation Mistakes: Environment & Vapor Pressure Deficit (VPD) Kevin Jodrey /Green Flower

    At Dr. Greenhouse we focus on what's important to our clients: cultivating a consistent, high quality crop using CEA technology. Understanding how plants interact with their environment is at the core of everything we do. Every design, every decision, every analysis centers around crop performance, system operations, and facility profitability. We recognize (and relish) that indoor farms are complicated systems with a lot of moving parts, all interacting with each other. It's not easy designing or operating these facilities, so we're glad you're doing it. And we're here to help make your operation more productive and profitable!

    A video outlining the concepts of VPD and Humidity and how they work with Argus products.

    Argus A Leader in Control Technology

    Argus is an automated control systems pioneer with over thirty years of leadership and innovation in control technology. We were among the first to use computers for integrating the control of greenhouse environments and irrigation systems. Today our systems are used in horticulture and biotechnology research facilities, universities, aquaculture and aquaponics, and many other custom control applications at sites throughout the world.

    We understand that complex environments and engineered bio-production facilities require individually tailored strategies designed around the needs of the target activities. We also understand that greenhouses and other specialized facilities behave a lot differently than conventional buildings and often require much more complex equipment systems and backup contingencies to maintain optimal climates and growth processes.

    Argus Controls won this category after being selected as one of the finalists and being voted the best system by the cannabis community.

    Randy Flemming is well-known and well-respected within the cannabis subculture of North America. Prior to serving as the first master grower at Organigram, Randy had been a recreational researcher of cannabis working towards a better understanding of the plant at all stages of its life cycle. Affectionately known as “The Pot Whisperer”, Randy contends that “humility” is the most important ingredient in cannabis cultivation acknowledging that the plant in a living soil knows what to do.

    Remo Colasanti

    Remo Colasanti has been growing legal medical cannabis for 17 years, since being granted a federal exemption from Canadian cannabis laws in 2001. He has become one of the top figures in the medical cannabis industry, both in Canada and internationally. Known worldwide in the medical cannabis industry, his accomplishments include independently winning 37 awards in 14 international medical cannabis competitions.

    Grow Room and Greenhouse VPD Calculator

    Vapour-pressure deficit

    Ohio State University Extension Fact Sheet

    Food, Agricultural and Biological Engineering

    1680 Madison Ave., Wooster, OH 44691

    Greenhouse Condensation Control: Understanding and Using Vapor Pressure Deficit (VPD)


    Jessica J. Prenger, Research Engineer

    Peter P. Ling, Assistant Professor,%20AEX-804-01.htm

    VPD Vs Humidity In Your Cannabis Grow Room by John Berfelo

    Everest Fernandez –Vapor pressure deficit explained in 5-ish minutes. What is VPD? How do you measure VPD in your grow room? What VPD range is good for propagation, vegetative and flowering? How are relative humidity, leaf temperature and air temperature combined into VPD and which units of pressure are used?

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