Category - TECHNOLOGY

greenhouse growers should pay attention to vapor-pressure deficit and not relative humidity

Why the Vapor-Pressure Deficit (VPD) is an...

10 April 2022

The Vapor Pressure Deficit (VPD) is one of the main forces driving evapotranspiration in plants. The VPD is the difference between the maximum amount of water the air can hold and the amount it does contain. ore and more growers are doing VPD...

Roll-up sides and roof vent to improve the greenhouse air ventilation exchange capacity

Fluid dynamics: Should I add a roof vent to...

5 April 2021

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The use of high tunnels (covered with plastic film) is widespread especially in Europe and North-America for many target crops. [...] Growers usually use the passive ventilation on the sides with manual or motorized mechanisms called sides roll...

Optimal daily light integral for leafy greens crops with hydroponic system NFT

Daily Light Integral interactive tool for...

27 February 2021

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DLI is now a common term (measurement) used by commercial growers and plant scientists. In this article,an interactive and useful tool made by Joanne Logan and James Faust to check the Annual and Monthly DLI Values (mol/m2/day) in the United...

Greenhouse engineering: psychrometric chart

Air humidity – How to read a...

29 December 2020

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The "psychrometric diagram" of humid air is a tool to facilitate the representation of air transformations. [...] The basic concept is that there is a relationship between temperature and saturation humidity

UV rays positive influence to the crops in horticulture

Why more growers are using UV-Open...

22 July 2020

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Some UV radiation can interfere with growth, development, photosynthesis, flowering, pollination and transpiration...

Active ventilation: a positive pressure...

3 July 2020

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The concept of positive pressure ventilation consists of mechanically injecting fresh air from outside to inside the greenhouse into the growing area. Positive pressure ventilation allows for maximum exclusion of insects and uniformity of...

Natural vanilla extraction technologies

5 December 2019

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Vanilla is one of the most expensive spice in the world. It is highly used for the perfumery and the food industry, in fact, for both usages the vanillin content is the main target at the end of the extraction process. Indeed, the concentration...

Benefits of the high pressure fogging...

18 November 2019

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Fogging system is an essential equipment in the greenhouse industry. The major advantage of the high pressure fogging is to flash evaporating billions of tiny water particles [...] It is more efficient than a low-pressure fogging to decrease...

New generation of greenhouse film:...

4 November 2019

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Today, companies are working on photoluminescent films to cover the greenhouse roof and claddings. The new film has a pink color with new technical proprieties... These films are specially designed to modify and optimize the light spectrum

Horticulture and greenhouse industry best blog

Daily Light Integral (DLI): lighting...

21 October 2019

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The Daily Light Integral (DLI) is is the amount of PAR received each day as a function of light intensity (instantaneous light: μmol·m -2 ·s -1 ) and duration (day). It is expressed as moles of light (mol) per square meter (m -2 ) per day (d -1...