June 29, 2015
Customizing Crop Foliage Color With LEDs: Red Leaf Lettuce
In the first of a four-part series highlighting the multiple uses of light-emitting diodes (LEDs), researchers share how end-of-production supplemental lighting with LEDs enhances red leaf lettuce color prior to harvesting and shipping.
January 26, 2015
Warehouse Growing Works With The Right Variables
The debate about whether warehouse growing or greenhouse growing is more efficient and profitable is largely based on grower preference, types of plants grown and available technologies, according to various industry players. Traditionally, greenhouse growing has been the norm. However, warehouse growing is becoming increasingly favorable with certain growers.
June 10, 2014
Michigan State University To Hold Discussion On Lighting Standards For LEDs
Industry members are invited to attend a July 28 meeting to discuss horticultural lighting standards for light-emitting diodes (LEDs), facilitated by Michigan State University (MSU). The two-hour roundtable discussion will take place during the American Society for Horticultural Science (ASHS) annual meeting in Orlando, Fla.
April 30, 2014
Conviron Partners With Valoya To Extend LEDS Into New Markets
Canada-based Conviron and Valoya of Finland recently announced an agreement for the distribution and integration of Valoya LEDs into Conviron growth chambers and rooms. Conviron is now the exclusive distributor of Valoya's products to seed and biotech companies, government institutions and universities in North America, India, Australia and Brazil.
April 29, 2014
Illumitex And GGS Partner To Provide Complete Growing Solutions In Horticulture
The strategic alliance between the two companies will provide complete growing solutions to all horticulture markets including vegetable, flower and medicinal cannabis in both greenhouse and controlled environment agriculture applications.
February 12, 2014
Diffuse Light Results In 25 Percent Growth Rate Increase, Wageningen UR Study Shows
Anthurium plants produced in light-diffused greenhouses equipped with Svensson’s Harmony screens were ready for sale at 16 weeks compared to the normal 22 weeks.
October 7, 2013
LEDs Could Eventually Manipulate Scent, Color In Ornamentals And Edibles
With the ability to deliver specific light wavelengths with LED lights, growers, retailers and consumers could eventually manipulate the scent, color, flavor, postharvest life and other characteristics of ornamental and edible crops.
September 17, 2013
LEDs Reduce Costs For Greenhouse Tomato Growers According To Purdue Study
Tomatoes grown around LED lights in the winter can significantly reduce greenhouse energy costs without sacrificing yield, according to a Purdue University study. Cary Mitchell, a professor of horticulture, said the average tomato is shipped about 1,500 miles from warmer climates where they’re grown to cooler climates that cannot produce the fruit cost-effectively in the winter. That journey is costly, however, because tomatoes are picked green and ripen during shipping, decreasing quality and flavor. The lengthy shipping distance also adds to the industry’s carbon footprint. “It makes it really hard for the greenhouse industry to grow tomatoes well in the offseason. We’re trying to change that and make it affordable,” Mitchell said. Energy costs drive up prices for producers who might want to grow tomatoes in greenhouses in states that have winters inhospitable to growing food. Greenhouses must be heated, and shorter, overcast days require costly lighting. Mitchell and doctoral […]
September 13, 2013
Comparing LED Lighting To High-Pressure Sodium Lamps
Cuttings of vegetatively propagated bedding plants are frequently rooted in late winter and early spring to meet the spring and early summer market demand for flowering bedding plants. However, this is also the time when dirty and old glazing material, interior superstructures, and hanging baskets suspended above benches reduce already seasonally low ambient outdoor daily light integrals (DLIs) inside the greenhouse. Increasing the DLI during propagation has been shown to improve growth and quality of rooted cuttings, as well as reduce time to flower after transplanting. While maintaining clean glazing material, minimizing superstructure and reducing the density of hanging baskets may increase greenhouse DLI, the only way to appreciably increase DLI is to provide supplemental or photosynthetic lighting. Light-emitting diodes (LEDs) are solid-state, semi-conducting diodes that can emit light from ~250 nm to ≥1000 nm. There are several features of LEDs that make them attractive alternatives to high-pressure sodium (HPS) […]
April 22, 2013
Diffuse Lighting Offers Multiple Benefits
Growers are increasingly learning that steering the greenhouse climate, which includes the related factors of light levels, temperature and humidity, can yield big gains in terms of plant quality and productivity as well as economic efficiency in heating and cooling expenses. Researchers, meanwhile, have been demonstrating that diffuse light plays an important role in achieving those goals. Materials have been developed to diffuse direct solar radiation, and use of diffuse light begins with an understanding of light and its behavior. Solar RadiationSolar radiation passes through the top of the atmosphere essentially unchanged by its passage through space. As it moves, it interacts with gas molecules, water droplets and aerosols and is gradually absorbed into the atmosphere. Radiant energy is converted into internal energy. It ceases to exist as radiant energy and heats the atmosphere directly. Very little of this absorption happens in visible wavelengths. Rather, ozone absorbs most of the […]
April 19, 2013
DLICALC Online Tool Helps Growers Caculate Daily Light Integral
Managing all the different environmental and cultural aspects of greenhouse crop production can be an intimidating and daunting task, especially during the peak production season. But it’s necessary to produce a high-quality, salable plant. The greenhouse is full of moving targets, from root zone pH and EC to plant growth, air temperature and light. Managing each of the parameters of greenhouse crop production to consistently produce quality crops on time can be a challenge. Thankfully, the development of decision-support tools can aid greenhouse growers. GROCALC is a suite of electronic grower decision support tools that include ALKCALC, FERTCALC and PGRCALC. These programs are useful for making calculations related to greenhouse crop culture including water acidification requirements, fertilizer solution and plant growth regulator (PGR) mixing. However, there are few or no tools available to help make calculations related to the greenhouse light environment. Although light is frequently discussed in terms of […]
October 30, 2012
Ruibal’s Plants Uses Supplemental Lighting To Speed Flowering
When the weather gets warm, nearly everyone is itching to get outdoors. When the weather gets warm weeks earlier than normal, consumers and landscapers start their spring activities earlier, too, and that means they want their plants sooner. The weather this spring really was unseasonably warm. The National Climatic Data Center (NCDC) reports that the United States experienced the warmest spring ever. The NCDC monthly climate report for May indicated that “with the warmest March, third warmest April and second warmest May,” 2012 had the warmest spring on record and the warmest year to date. The NCDC also indicated that this spring’s nationally averaged temperature of 57.1°F was 5.2°F above the long-term average. These balmy temperatures inspired consumers to begin planting flowers. Unfortunately for eager gardeners and garden center owners, growers were not prepared to handle the early demand for spring color. Customers Want Color Early Matt Ruibal, vice president […]