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  • Infrared Thermometers for Monitoring Plant and Substrate Temperatures

    Published on December 9, 2017
    In this article, we will discuss how to use a hand-held infrared thermometer to determine instantaneous temperatures of plant surfaces, root zone or floor heating systems, heat exchangers, and other greenhouse equipment that may have hot surfaces.

  • Does light quantity trump light quality?

    Published on December 5, 2017
    Some of our recent research confirms that light quality (such as the ratio or red to far red) has a greater effect on plant growth when light intensity is low than when it is high.

  • Factors that influence leaf coloration

    Published on November 15, 2017
    Growers usually focus on quality attributes that relate to flowering, but this article reviews cultural and environmental factors that influence foliage color.

  • How does Spray Water Alkalinity affect the Efficacy of Commonly used Plant Growth Regulators?

    Published on November 7, 2017
    Did you know that pH of the spray solution and air temperature at application can influence the efficacy of some PGRs? We will show you how to save time and money, by monitoring and adjusting two often overlooked factors that can influence PGR efficacy.

  • Developing new plant lighting standards

    Published on October 23, 2017
    Standards are developed so there is consistency and conformity in products to improve confidence and comparability in new technologies.

  • Investment considerations for greenhouse lighting

    Published on October 11, 2017
    Many growers install and operate supplemental (photosynthetic) lighting to increase crop quality and yield. This article describes some of the factors to consider when investing in a supplemental lighting system for greenhouse crop production.

  • Supplemental greenhouse lighting: LED or HPS?

    Published on September 20, 2017
    Researchers at Michigan State University see if the results from producing high-quality seedlings with LEDs justify the higher capital outlay for installation.

  • Sole-source lighting of plants

    Published on September 13, 2017
    Sole-source lighting is a term used to describe the deliver of light to plants that do not also receive light from the sun. In other words, electric lighting is delivered indoors and provides the sole source of light for plant growth and development.

  • Lighting plans: Their generation and importance

    Published on August 17, 2017
    Light intensity and uniformity are critical to successful production of plants. This article describes how lighting plans are developed, and why they are so important when comparing lighting technologies.

  • Supplemental and sole source LED lighting

    Published on August 9, 2017
    Joining me today is Erik Runkle, professor at Michigan State University. Erik is well known in this magazine for his “Technically Speaking” column appearing inside the back cover.

  • Increasing height of chrysanthemum with PGR drenches

    Published on July 10, 2017
    Results are presented for an experiment in which we compared the efficacy of spray versus drench applications of a plant growth regulator (PGR) at increasing plant height of potted chrysanthemum plants.

  • Plant lighting efficiency and efficacy

    Published on July 10, 2017
    Plant lighting continues to be a hot topic, especially as light-emitting diode (LED) technology continues to advance. Learn more about how electric lamps convert electricity into photons of light useful to plants.

  • Growing plants with green light

    Published on June 7, 2017
    Green light can be defined as radiation with wavelength between 500 and 600 nanometers. Green light is within the photosynthetically active waveband of 400 to 700 nm, yet its effects on plant growth and development are not well understood.

  • Understanding how PGRs work

    Published on May 17, 2017
    Plant growth regulators are chemical compounds that regulate various growth and developmental processes in plants, such as seed germination, rooting, branching, flowering, fruit development, dormancy and plant growth habit.

  • Asclepias tuberosa - Butterfly weed

    Published on April 12, 2017
    Several species of milkweed, or asclepias, are native to North America, and this year the Perennial Plant Association has chosen one of them as Perennial Plant of the Year: Asclepias tuberosa.

  • The importance of light uniformity

    Published on March 3, 2017
    Managing light is obviously critical to the production of crops grown in controlled environments. When considering the different dimensions of light, we often overlook the importance of light uniformity.

  • Far red is the new red

    Published on February 6, 2017
    Adding far red to red and blue light from LEDs brings control of plant growth to the next level.

  • Effects of blue light on plants

    Published on February 2, 2017
    Blue light is usually referred to as radiation with wavelengths between 400 and 500 nanometers. This waveband is within the visible spectrum, has relatively high energy, and has pronounced effects on plant growth and flowering.

  • Vertical farming

    Published on January 9, 2017
    Vertical farming is the production of plants in multiple vertical layers indoors, such a controlled-environment buildings, repurposed warehouses, growth chambers and shipping containers.

  • Daily Light Integral (DLI) Maps

    Published on December 23, 2016
    daily light integral dli maps