Preliminary Analysis of Greenhouse Microclimate Heterogeneity for Different Weather Conditions

Suay, Ricardo Muñoz; López, Susana; Granell, R.; Moltó, Enrique; Fatnassi, H.; Boulard, Thierry

doi:10.17660/actahortic.2008.797.12

Cited by 7 publications

(4 citation statements)

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“…In the literature, different temporarily and spatially small-scale climates are all described by the term microclimate (e.g. [5,6]). Therefore, we define two climates with different spatial and temporal scales, (1.)…”

Section: Introductionmentioning

confidence: 99%

Substantial differences occur between canopy and ambient climate: Quantification of interactions in a greenhouse-canopy system

et al. 2020

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Organ temperature and variation therein plays a key role in plant functioning and its responses to e.g. climate change. There is a strong feedback between organ, especially leaf, temperature and the climate within the canopy (canopy climate), which in turn interacts with the climate outside the canopy (ambient climate). For greenhouses, the determinants of this interplay and how they drive differences between canopy and ambient climate are poorly understood. Yet, as many experiments on both regular greenhouse crops and field crops are done in greenhouses, this is crucial to know. Therefore, we designed an experiment to quantify the differences between ambient and canopy climate and leaf temperature. A path analysis was performed to quantify the interactions between components of the greenhouse canopy-climate system. We found that with high radiation the canopy climate can be up to 5˚C cooler than the ambient climate, while for cloudy days this was only 2˚C. Canopy relative humidity (RH) was up to 25% higher compared to ambient RH. We showed that radiation is very important for these climate differences, but that this effect could be partly counteracted by turning off supplementary light (i.e. due to its indirect effects e.g. changing light distribution). Leaf temperature was substantially different, both higher and lower, from the canopy air temperature. This difference was determined by leaf area index (LAI), temperature of the heating pipe and the use of supplementary light, which all strongly influence radiation, either shortwave or thermal radiation. The difference between leaf and ambient air temperature could be decreased by decreasing the LAI or increasing the temperature of the heating pipe.

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Section: Introductionmentioning

confidence: 99%

Substantial differences occur between canopy and ambient climate: Quantification of interactions in a greenhouse-canopy system

et al. 2020

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“…Therefore, at the local level, the technical managers of the farms observe accelerated production cycles in some areas within the same greenhouse, as well as low yields and poor-quality products in other regions of the structure [ 3 ]. This is even more critical because the management of cultural, agronomic, irrigation and fertilization tasks are established for a greenhouse, assuming that the microclimate within the whole area is homogeneous [ 59 ]. Finally, in accordance with the work developed by Fatnassi et al [ 60 ], this type of micro-climatic behavior allows the establishment of pests and diseases that generate large economic losses and can generate a high rate of reports of pest interceptions at the control points located at the ports of export, which are monitored by the sanitary organizations of each country, affecting the phytosanitary status of the exporting country.…”

Section: Resultsmentioning

confidence: 99%

Microclimatic Evaluation of Five Types of Colombian Greenhouses Using Geostatistical Techniques

Villagrán

Flores²,

Akrami

et al. 2022

Sensors

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In Colombia, the second-largest exporter of cut flowers worldwide and one of the South American countries with the largest area of crops under cover, passive or naturally ventilated greenhouses predominate. Locally, there are several types of greenhouses that differ in architecture, size, height, shape of roof and ventilation surfaces, of which many characteristics of the microclimate generated in their interior environment are unknown. This generates productive limitations that in some way may be limiting the yield, quality and health of the final products harvested; in addition, Colombian producers do not have the ability to monitor the microclimate of their farms, much less to correlate microclimate data with data on crop production and yield. Therefore, there is a need for the Colombian grower to know the most relevant microclimate characteristics generated in the main greenhouses used locally. The objective of this work was to carry out a microclimatic characterization of the five most used types of greenhouses in Colombia. The main results allowed determining that in these structures, there are conditions of high humidity and low vapor pressure for several hours of the day, which affects the physiological processes of growth and development of the plants. It was also identified that for each type of greenhouse, depending on the level of radiation, there is a significant microclimatic heterogeneity that may be the cause of the heterogeneity in plant growth, which is a common characteristic observed by the technical cultivation personnel. Therefore, it can be concluded that it is urgent to propose microclimatic optimization strategies to help ensure the sustainability of the most important production systems in the country.

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“…In several studies on the monitoring or simulation of internal weather conditions, the authors did not consider the effects due to the presence of plants (Sapounas et al, 2008;Bojacá et al, 2009;Ferentinos et al, 2017), or the concrete floor inside greenhouses (Suay et al, 2008). Due to the difficulties of maintaining plants with the same development characteristics inside the greenhouse, in each of the proposed configurations, we decided to plant grass (São Carlos species).…”

Section: Methodsmentioning

confidence: 99%

“…Several studies evaluated the horizontal distribution in environments with mechanical ventilation systems (Balendonck et al, 2014), natural ventilation (Ferentinos et al, 2017;García-Ruiz et al, 2018) and natural ventilation associated with mechanical ventilation (Kittas et al, 2012;López et al, 2013). As to the vertical distribution, other studies also evaluated greenhouse microclimates with different systems, such as natural ventilation (Suay et al, 2008), or mechanical ventilation and evaporative cooling (Kutta and Hubbart, 2014;Zorzeto and Leal, 2017).…”

Section: Introductionmentioning

confidence: 99%

Wireless sensor network to identify the reduction of meteorological gradients in greenhouse in subtropical conditions

Cesar

Leal

Branquinho

et al. 2020

J Agricult Engineer

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Spatial and temporal monitoring of temperature and relative humidity is essential for greenhouse management, therefore, wireless sensor networks (WSN) can offer crucial advantages. The objective of this work was to use a WSN to characterize and map the horizontal and vertical variability of air temperature and relative humidity inside a greenhouse using five different configurations. The configurations were based on combinations between the following actuating mechanisms: i) mechanical ventilation (by two exhaust fans); ii) natural ventilation (through the roof vent openings); iii) shading through the use of thermo-reflective screen. The WSN was designed with 45 spatially distributed measuring points, and the air temperature and relative humidity were recorded automatically every 30 seconds, for ten consecutive days, for each configuration. Our results show that the horizontal and vertical homogeneity of the meteorological elements depends on the actuating mechanism used in the greenhouse. Mechanical ventilation approximated the temperature and relative humidity of the indoor and outdoor air, with a homogeneous horizontal distribution throughout the environment. Opening the roof vent reduced vertical gradients of temperature and relative humidity. Our observations also showed that the combination of the use of roof vent openings with mechanical ventilation is an effective way to achieve horizontal homogeneity of meteorological elements.

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Preliminary Analysis of Greenhouse Microclimate Heterogeneity for Different Weather Conditions

Cited by 7 publications

References 0 publications

Substantial differences occur between canopy and ambient climate: Quantification of interactions in a greenhouse-canopy system

Substantial differences occur between canopy and ambient climate: Quantification of interactions in a greenhouse-canopy system

Microclimatic Evaluation of Five Types of Colombian Greenhouses Using Geostatistical Techniques

Wireless sensor network to identify the reduction of meteorological gradients in greenhouse in subtropical conditions

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