Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements
Aerodynamic and canopy resistances have long been considered to be of key interest in model equation parameterization, particularly for the accurate estimation of crop evapotranspiration. However, model parameters applied in greenhouses showed variation affected by the micrometeorological environmen...
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doaj-11eb45177a3b44c7aecc0238d42bf3b92021-04-02T17:49:44ZengMDPI AGAgronomy2073-43952020-12-01101985198510.3390/agronomy10121985Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature MeasurementsGeorgios Nikolaou0Damianos Neocleous1Evangelini Kitta2Nikolaos Katsoulas3Department of Agriculture Crop Production and Rural Environment, School of Agricultural Sciences, University of Thessaly, Fytokou Str., 38446 Volos, GreeceDepartment of Natural Resources and Environment, Agricultural Research Institute, Ministry of Agriculture, 1516 Nicosia, CyprusDepartment of Agriculture Crop Production and Rural Environment, School of Agricultural Sciences, University of Thessaly, Fytokou Str., 38446 Volos, GreeceDepartment of Agriculture Crop Production and Rural Environment, School of Agricultural Sciences, University of Thessaly, Fytokou Str., 38446 Volos, GreeceAerodynamic and canopy resistances have long been considered to be of key interest in model equation parameterization, particularly for the accurate estimation of crop evapotranspiration. However, model parameters applied in greenhouses showed variation affected by the micrometeorological environment. Three experiments were carried out in a plastic greenhouse to evaluate microclimate effects on resistances of a soilless cucumber crop. The regression analysis of canopy-to-air temperature (<i>T<sub>c</sub></i> − <i>T<sub>a</sub></i>) difference on air vapor pressure deficit (VPD) was substituted into the energy balance equation for the estimation of aerodynamic and canopy resistance values. As expected, a fan and pad evaporative cooling system proved to be the more efficient method of decreasing crop temperature (<i>T<sub>c</sub></i>) compared to the forced air ventilation system. The estimated transpiration by the Penman–Monteith model based on calculated aerodynamic and canopy resistance values successfully validated values measured with lysimeters in different growing periods. In this article, we report for the first time the calculation of aerodynamic and canopy resistance values inside a greenhouse based on equations for an open field that were found in the literature. Results may be helpful in Mediterranean greenhouses for direct determinations of plant water evaporative demand and smart climate control systems.https://www.mdpi.com/2073-4395/10/12/1985canopy-to-air temperatureenergy balance equationtranspirationfan and pad evaporative cooling systemforced ventilationsoilless culture |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Georgios Nikolaou Damianos Neocleous Evangelini Kitta Nikolaos Katsoulas |
spellingShingle |
Georgios Nikolaou Damianos Neocleous Evangelini Kitta Nikolaos Katsoulas Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements Agronomy canopy-to-air temperature energy balance equation transpiration fan and pad evaporative cooling system forced ventilation soilless culture |
author_facet |
Georgios Nikolaou Damianos Neocleous Evangelini Kitta Nikolaos Katsoulas |
author_sort |
Georgios Nikolaou |
title |
Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements |
title_short |
Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements |
title_full |
Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements |
title_fullStr |
Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements |
title_full_unstemmed |
Estimation of Aerodynamic and Canopy Resistances in a Mediterranean Greenhouse Based on Instantaneous Leaf Temperature Measurements |
title_sort |
estimation of aerodynamic and canopy resistances in a mediterranean greenhouse based on instantaneous leaf temperature measurements |
publisher |
MDPI AG |
series |
Agronomy |
issn |
2073-4395 |
publishDate |
2020-12-01 |
description |
Aerodynamic and canopy resistances have long been considered to be of key interest in model equation parameterization, particularly for the accurate estimation of crop evapotranspiration. However, model parameters applied in greenhouses showed variation affected by the micrometeorological environment. Three experiments were carried out in a plastic greenhouse to evaluate microclimate effects on resistances of a soilless cucumber crop. The regression analysis of canopy-to-air temperature (<i>T<sub>c</sub></i> − <i>T<sub>a</sub></i>) difference on air vapor pressure deficit (VPD) was substituted into the energy balance equation for the estimation of aerodynamic and canopy resistance values. As expected, a fan and pad evaporative cooling system proved to be the more efficient method of decreasing crop temperature (<i>T<sub>c</sub></i>) compared to the forced air ventilation system. The estimated transpiration by the Penman–Monteith model based on calculated aerodynamic and canopy resistance values successfully validated values measured with lysimeters in different growing periods. In this article, we report for the first time the calculation of aerodynamic and canopy resistance values inside a greenhouse based on equations for an open field that were found in the literature. Results may be helpful in Mediterranean greenhouses for direct determinations of plant water evaporative demand and smart climate control systems. |
topic |
canopy-to-air temperature energy balance equation transpiration fan and pad evaporative cooling system forced ventilation soilless culture |
url |
https://www.mdpi.com/2073-4395/10/12/1985 |
work_keys_str_mv |
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