Abiotic Factors

Fertilizing Greenhouse Crops

Maintaining adequate nutrition is among the most critical aspects of producing greenhouse crops. At present most growers utilize a liquid feed program as their primary means of supplying plant nutrients. This program may also be supplemented with granular or slow release fertilizers added to the growing medium. The frequency of fertilizer applications also influences plant …

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No-gas greenhouse

In the heart of the flower zone in the west of the Netherlands, a revolutionary greenhouse is taking shape. Modern cooling and heating technology, groundwater aquifers and environmental care work hand in hand to take Dutch orchid cultivation into the future.   DATE 2017-07-17 AUTHOR Jan Tazelaar The orchid is legendary among the world’s flowers for its beauty and …

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Maximizing Hydroponic Crop Production

Penny Goff, general manager and co-owner of Gritt’s Midway Greenhouse in Red House, W. Va., says all of the greenhouse vegetable growers she knows who grow hydroponically use some type of substrate. “Hydroponics to me means growing with water, not necessarily in water,” Goff says. “Growing in a substrate that doesn’t have any nutrient-holding capabilities.” …

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Growing Media & pH

Although most growers are familiar with pH, few realize how complex this property really is. In general, the term pH refers to the acidity/alkalinity of a growing medium. However, these factors also influence the availability of many nutrient elements as well as physiological responses within the plant. The following information reviews the basic concepts of …

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Effects of Elevated Carbon Dioxide on Photosynthesis and Carbon Partitioning: A Perspective on Root Sugar Sensing and Hormonal Crosstalk

Abstract Plant responses to atmospheric carbon dioxide will be of great concern in the future, as carbon dioxide concentrations ([CO2]) are predicted to continue to rise. Elevated [CO2] causes increased photosynthesis in plants, which leads to greater production of carbohydrates and biomass. Which organ the extra carbohydrates are allocated to varies between species, but also …

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The Advantages of Naturally Ventilated Commercial Greenhouses

As we start to prepare for the warmer months that may seem far away with the late snow flurries and colder temperatures we’ve experienced this spring (hurry up summer!), it’s easy to forget the uncomfortable heat that those warmer months bring. When temperatures can rise to an unbearable 111°F we’re lucky to have air conditioning in our …

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Maximize photosynthesis with moving air

We measured greenhouse carbon dioxide (CO2) concentrations within the  leaf canopy of roses grown for cut flowers over several years. Often, during the day we found the CO2 concentration was depleted to levels as low as 225 ppm, even though vents were opened. Apparently, CO2 was being absorbed quickly by the rose leaves and  fresh air was not moving sufficiently …

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Four Keys to Optimal Air Flow in the Greenhouse

Maintaining consistent air flow in the greenhouse is critical to producing healthy plants. However, there are different theories as to how to achieve an optimal air flow system. The true goal of any air distribution system in the greenhouse, Becker says, should be to homogenize the air, as plants can transpire more evenly and efficiently …

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