Crop growth and development in closed and semi-closed greenhouses

Qian, Tian

doi:10.18174/403466

Cited by 5 publications

(12 citation statements)

References 116 publications

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“…The results of the study showed in both semi-closed greenhouses and in the open one, that the CO 2 concentration was decreased by increasing solar radiation. In the closed greenhouse there was no effect of the outside climate on the CO 2 concentration of the greenhouse air [36].…”

Section: Co 2 Concentrationmentioning

confidence: 91%

“…One of the main reasons for reducing (at a cost) the need for ventilation has been mainly to lengthen the period when CO 2 enrichment of the greenhouse air can be used to increase crop yield [35]. The authors of [36] compared the performance of an open (conventional) greenhouse to that of two semi-closed greenhouses with cooling capacity of 150 and 350 W m −2 and to that of a closed greenhouse (cooling capacity of 700 W m −2 ). The results of the study showed in both semi-closed greenhouses and in the open one, that the CO 2 concentration was decreased by increasing solar radiation.…”

Section: Co 2 Concentrationmentioning

confidence: 99%

“…In [11], an average tomato yield production increase of 5.5% in semi-closed greenhouses compared to conventional ones was reported. The higher yields observed in closed and semi-closed greenhouses compared to the conventional ones are mainly due to the higher CO 2 concentration that can be maintained in semi-closed greenhouses [36] (Table 3). This is in agreement with the results reported in [22] where, compared to a conventional greenhouse, the photosynthesis expressed as CO 2 uptake was 21% higher in the semi-closed greenhouse, mainly due to 25% higher CO 2 .…”

Section: Crop Growth and Yieldmentioning

confidence: 99%

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Design, Control, and Performance Aspects of Semi-Closed Greenhouses

Σαπουνάς¹,

Katsoulas

Slager³

et al. 2020

Agronomy

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Several greenhouse energy saving technologies and management strategies have been developed in order to meet the needs for implementation of production systems with low and efficient energy use and low CO2 emissions. Towards this aim, a number of greenhouse concepts that make use of these technologies have been developed and tested, such as the closed greenhouse, the solar greenhouse, the energy-producing greenhouse, and others. The closed or semi-closed greenhouse concept is widely accepted as a concept to achieve the targets for energy saving and low CO2 emissions. A major difference of this concept to a conventional greenhouse is that climate control by window ventilation is partially or completely replaced by systems that treat the air, regulate the air exchange between inside and outside, and in few cases collect and store the excess heat load in order to be reused at a later time. A semi-closed greenhouse allows temperature, humidity, and CO2 concentration to be controlled independently, during heating as well as cooling mode function. Among others, semi-closed greenhouses offer possibilities for better control of greenhouse environment, for increasing water use efficiency by decreasing the evaporation losses via ventilation and for reducing the pesticide use by decreasing the entry of insects and fungal spores in the greenhouse through the ventilation openings. The aim of this review is to focus on the design, control, and performance aspects of semi-closed greenhouse systems which use either (a) an air treatment corridor with evaporative cooling pad connected with an air distribution system with perforated polyethylene tubes or (b) decentralized air treatment units distributed inside the greenhouse. It gives on overview of the principles of the semi-closed greenhouse, the potential energy consumption and the expected savings. Additionally, it gives insight into the climate conditions in relation to the conventional greenhouse, crop growth, water consumption, and pest control.

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Section: Co 2 Concentrationmentioning

confidence: 91%

Section: Co 2 Concentrationmentioning

confidence: 99%

Section: Crop Growth and Yieldmentioning

confidence: 99%

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Design, Control, and Performance Aspects of Semi-Closed Greenhouses

Σαπουνάς¹,

Katsoulas

Slager³

et al. 2020

Agronomy

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“…In spite of these limitations, however, the different methods have provided much valuable knowledge on optimal climate conditions for different crops. So far, steady-state photosynthetic responses to environmental factors have been extensively studied, but knowledge of the effect of continuous variation in climate on photosynthesis remains scarce (Marcelis et al, 2014).With the introduction of semi-closed greenhouses, new possibilities have opened with respect to climate control and energy efficiency of greenhouses (Dannehl et al, 2014;Marcelis et al, 2014;Qian, 2017). With this type of greenhouse, the air exchange rate between the greenhouse and the outside environment can be measured, since the ventilation is controlled by fans in the greenhouse walls and not by roof vents.…”

mentioning

confidence: 99%

“…With the introduction of semi-closed greenhouses, new possibilities have opened with respect to climate control and energy efficiency of greenhouses (Dannehl et al, 2014;Marcelis et al, 2014;Qian, 2017). With this type of greenhouse, the air exchange rate between the greenhouse and the outside environment can be measured, since the ventilation is controlled by fans in the greenhouse walls and not by roof vents.…”

mentioning

confidence: 99%

Semi-closed greenhouse photosynthesis measurements – A future standard in intelligent climate control

Mortensen¹,

As²,

Ringsevjen³

et al. 2020

Europ.J.Hortic.Sci

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However, all of these methods have severe limitations in terms of providing accurate measurements of the performance of a canopy in a large greenhouse. The methods employed will usually change the climate conditions in relation to those found in the greenhouse, and it therefore becomes difficult to interpret the measurements. In spite of these limitations, however, the different methods have provided much valuable knowledge on optimal climate conditions for different crops. So far, steady-state photosynthetic responses to environmental factors have been extensively studied, but knowledge of the effect of continuous variation in climate on photosynthesis remains scarce (Marcelis et al., 2014).With the introduction of semi-closed greenhouses, new possibilities have opened with respect to climate control and energy efficiency of greenhouses (Dannehl et al., 2014;Marcelis et al., 2014;Qian, 2017). With this type of greenhouse, the air exchange rate between the greenhouse and the outside environment can be measured, since the ventilation is controlled by fans in the greenhouse walls and not by roof vents. This gives rise to new possibilities with respect to continuously recording crop photosynthesis. Photosynthesis can be accurately measured by precisely measuring airflow, and the inlet and outlet CO 2 concentration in the air. Our objective was therefore to evaluate the potential of measuring canopy photosynthesis in a large semi-closed greenhouse. Although numerous semi-closed greenhouses have been built worldwide, this method of continuously monitoring crop respons-

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Analysis of Spatial and Vertical Variability of Environmental Parameters in a Greenhouse and Comparison of Carbon Dioxide Concentration in Two Different Types of Greenhouses

et al. 2022

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This study was aimed to investigate spatial and vertical characteristics of greenhouse environments according to the location of the environmental sensors, and to investigate the correlations between temperature, light intensity, and carbon dioxide (CO 2 ) concentration according to the type of greenhouse. Temperature, relative humidity (RH), CO 2 , and light sensors were installed in the four-different vertical positions of the whole canopy as well as ground and roof space at the five spatial locations of the Venlo greenhouse. Also, correlations between temperature, light intensity, and CO 2 concentration in Venlo and semi-closed greenhouses were analyzed using the Curve Expert Professional program. The deviations among the spatial locations were larger in the CO 2 concentration than other environmental factors in the Venlo greenhouse. The average CO 2 concentration ranged from 465 to 761 µmol•mol -1 with the highest value (646 µmol•mol -1 ) at the Middle End (4ME) close to the main pipe (50∅) of the liquefied CO 2 gas supply and lowest (436 µmol•mol -1 ) at the Left Middle (5LM). The deviation among the vertical positions was greater in temperature and relative humidity than other environments. The time zone with the largest deviation in average temperature was 2 p.m. with the highest temperature (26.51°C) at the Upper Air (UA) and the lowest temperature (25.62°C) at the Lower Canopy (LC). The time zone with the largest deviation in average RH was 1 p.m. with the highest RH (76.90%) at the LC and the lowest RH (71.74%) at the UA. The highest average CO 2 concentration at each hour was Roof Air (RF) and Ground (GD). The coefficient of correlations between temperature, light intensity, and CO 2 concentration were 0.07 for semi-closed greenhouse and 0.66 for Venlo greenhouse. All the results indicate that while the CO 2 concentration in the greenhouse needs to be analyzed in the spatial locations, temperature and humidity needs to be analyzed in the vertical positions of canopy. The target CO 2 fertilization concentration for the semi-closed greenhouse with low ventilation rate should be different from that of general greenhouses.

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Crop growth and development in closed and semi-closed greenhouses

Cited by 5 publications

References 116 publications

Design, Control, and Performance Aspects of Semi-Closed Greenhouses

Design, Control, and Performance Aspects of Semi-Closed Greenhouses

Semi-closed greenhouse photosynthesis measurements – A future standard in intelligent climate control

Analysis of Spatial and Vertical Variability of Environmental Parameters in a Greenhouse and Comparison of Carbon Dioxide Concentration in Two Different Types of Greenhouses

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