Industrial scale greenhouses have, during the last decade, reached a high level of automation. However, the illumination is in general still controlled manually. One key factor in controlling the illumination in greenhouses is to detect how well the light energy is used for photosynthesis. Whereas too dim light means reduced production, too strong light is harmful for plants. The focus here is ...

abstract today, greenhouses are used for controlling different climacterics parameters, specially light and temperatures on agricultural productions. the most part of productions is vegetables production in traditional greenhouses (tg) and unfortunately productions quality and quantity in greenhouses is lower than modern (mg) ones. this experiment studies the effects of different climates of tw...

aims: in regard to increasing greenhouse area in iran followed by increased use of pesticides and contaminated crops, this study aimed to determine the frequency and types of consumed pesticides in kashan region, iran, greenhouses. instrument & methods: in this descriptive study in 2011-2012, samples was entered by census method. at the first step, a list of greenhouses was obtained from agricu...

The experimental study of air movement induced by natural ventilation in greenhouses requires a system to measure the air velocity "eld. A networked, two-dimensional sonic anemometer system was developed for simultaneous measurement of the instantaneous air speed and direction at 12 locations. The system performance was tested and validated against a mass #ow controller and a commercial, three-...

In conventional greenhouse systems, recent innovations have contributed to increased production levels, and at the same time, to the decreased ecological footprint in terms of the reduction of water use, nutrients and CO2 emissions. Several examples of application of standard and innovative technologies to improve production, optimize utilization of solar energy and increase efficiency of energ...

This study describes the simulation of gas demand for greenhouses in the agricultural area. Using the data provided by an energy company providing gas to over 3600 individual greenhouses , several models are developed to predict the gas demand of an individual green house. Using these models peak smoothing strategies for the overall gas demand can be developed and tested. Three of such peak smo...

Greenhouse culture plays a significant role in driving the agricultural development process by providing artificial conditions for production and/or neutralizing environmental variables. Obviously, planning for developing this production system requires understanding effective and limiting variables. Accordingly, the present study was conducted in 2018 in order to evaluate management indicators...

iran, with more than 4,400 hectares of cultivated area of ornamental flowers and plants as well as proximity to world markets, bebefits from only a small share in these markets. this party indicates the existence of problems in the production and development of greenhouses that if recognized can be effective in somehow solving those problems. the main objective followed in this study was to ide...

We are living in a great Greenhouse: our planet, the Earth. This sustainable system is almost closed, except the radiative energy received from the Sun. Understanding and respecting its principles is the only guaranty for a safe future of our species. The Greenhouse effect is a process by which a part of the incident solar energy is trapped by the lower atmosphere due to the action of some atmo...