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קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Microclimate and transpiration of greenhouse rose crops: Measurements and simulation
Year:
2006
Source of publication :
Acta Horticulturae
Authors :
ברק, מוטי
;
.
טייטל, מאיר
;
.
טנאי, יוסף
;
.
לירן, אור
;
.
Volume :
718
Co-Authors:
Liran, O., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Teitel, M., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Barak, M., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Tanny, J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Facilitators :
From page:
271
To page:
276
(
Total pages:
6
)
Abstract:
Prediction of greenhouse microclimate and crop temperature and transpiration from external conditions, using relatively simple models, is still considered a challenge. The goal of this research is to compare experimental results obtained in a greenhouse in which roses were grown with an existing theoretical model. Experiments were done in a naturally ventilated greenhouse with a floor area of 69 m2 that can be ventilated by two side openings, each about 3.0 m2, one on the west wall and the other on the east wall. A roof opening with an area of about 5 m2 was also available. Two modes of natural ventilation were studied, side openings, and a combination of roof and side openings. The side openings were covered with a 50-mesh screen while the roof opening was covered with a 17-mesh one. The potted plants (245 roses) were arranged in six rows in the east-west direction. Temperature and humidity were measured at the two ends of the central row at a height of about 1.5 m and at four heights (0.15, 1.1, 2 and 3 m above floor level) at the center of the greenhouse. Transpiration was measured by five lysimeters, four measuring the transpiration of one plant each and one measuring the transpiration of other four plants. Net radiation, solar radiation and PAR were measured at the center of the greenhouse about 0.5 m above the plants' top. Soil heat flux was measured about 5 cm below soil surface. A theoretical model (Boulard and Wang, 2000) based on Penman-Monteith equation was used to predict the interior air and crop temperatures and the transpiration rate. A good agreement was obtained with regard to the air temperature and transpiration between the model and experiment results. Averages of measured and predicted values were calculated for nine days of measurements, four hours each day (10:00 - 14:00). The average measured and predicted air temperatures were 30.5 and 30.7°C respectively and the corresponding values of the transpiration were 279 and 273 W m-2.
Note:
Related Files :
Penman-Monteith equation
Rosa
Roses
temperature
Temperature, Rosa
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר מתוך כינוס
;
.
Language:
אנגלית
Editors' remarks:
ID:
32173
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:07
Scientific Publication
Microclimate and transpiration of greenhouse rose crops: Measurements and simulation
718
Liran, O., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Teitel, M., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Barak, M., Institute of Agricultural Engineering, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Tanny, J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, POB 6, Bet-Dagan 50250, Israel
Microclimate and transpiration of greenhouse rose crops: Measurements and simulation
Prediction of greenhouse microclimate and crop temperature and transpiration from external conditions, using relatively simple models, is still considered a challenge. The goal of this research is to compare experimental results obtained in a greenhouse in which roses were grown with an existing theoretical model. Experiments were done in a naturally ventilated greenhouse with a floor area of 69 m2 that can be ventilated by two side openings, each about 3.0 m2, one on the west wall and the other on the east wall. A roof opening with an area of about 5 m2 was also available. Two modes of natural ventilation were studied, side openings, and a combination of roof and side openings. The side openings were covered with a 50-mesh screen while the roof opening was covered with a 17-mesh one. The potted plants (245 roses) were arranged in six rows in the east-west direction. Temperature and humidity were measured at the two ends of the central row at a height of about 1.5 m and at four heights (0.15, 1.1, 2 and 3 m above floor level) at the center of the greenhouse. Transpiration was measured by five lysimeters, four measuring the transpiration of one plant each and one measuring the transpiration of other four plants. Net radiation, solar radiation and PAR were measured at the center of the greenhouse about 0.5 m above the plants' top. Soil heat flux was measured about 5 cm below soil surface. A theoretical model (Boulard and Wang, 2000) based on Penman-Monteith equation was used to predict the interior air and crop temperatures and the transpiration rate. A good agreement was obtained with regard to the air temperature and transpiration between the model and experiment results. Averages of measured and predicted values were calculated for nine days of measurements, four hours each day (10:00 - 14:00). The average measured and predicted air temperatures were 30.5 and 30.7°C respectively and the corresponding values of the transpiration were 279 and 273 W m-2.
Scientific Publication
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