Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method

The Priestley-Taylor (PT) model was evaluated for estimating the real evapotranspiration (ETreal) of a drip-irrigated greenhouse tomato (Lycopersicon esculentum Mill.) crop. The net radiation incorporated in the PT model was estimated using meteorological variables. For this experiment, an automatic...

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Autores principales:	Valdés-Gómez,Héctor, Ortega-Farías,Samuel, Argote,Mauricio
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2009
Materias:	irrigation model crop coefficients net radiation soil heat flu
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100001
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spelling	oai:scielo:S0718-583920090001000012018-10-01Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor MethodValdés-Gómez,HéctorOrtega-Farías,SamuelArgote,Mauricio irrigation model crop coefficients net radiation soil heat flu The Priestley-Taylor (PT) model was evaluated for estimating the real evapotranspiration (ETreal) of a drip-irrigated greenhouse tomato (Lycopersicon esculentum Mill.) crop. The net radiation incorporated in the PT model was estimated using meteorological variables. For this experiment, an automatic weather station (AWS) was installed inside the greenhouse to measure solar radiation (Rgi), net radiation (Rn), air temperature (Ta) and relative humidity (RH). Another AWS was installed over a grass cover to measure atmospheric conditions outside the greenhouse. The experiment was carried out at the Panguilemo experimental station (35°23’ S, 71°40’ W, 110 m.a.s.l.) from August to December 2000. The PT model was evaluated using the ETreal obtained from the water balance (WB) method. In this case, values of ETreal by PT model were calculated using: a) Rgi and soil heat flux (G) = 0; b) Rgi and G ≠ 0; c) solar radiation measured outside the greenhouse (Rge) and G = 0; and d) Rge and G ≠ 0. For these cases, results indicated that PT model was able to compute ETreal with errors less than 5%. Also, Rn was calculated with a relative absolute error and a mean deviation lower than 6% and 0.07 mm d-1, respectively, using Rgi or Rge. Daily soil heat flux values equal to zero did not affect the calculation of ETreal values. Thus, the PT model evaluated in this study could be used for scheduling irrigation for a greenhouse tomato crop, using internal measurements of air temperature and relative humidity, and external measurements of solar radiation. In this case, PT model predicted the ETreal with an error of 6.1%.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.69 n.1 20092009-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100001en10.4067/S0718-58392009000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	irrigation model crop coefficients net radiation soil heat flu
spellingShingle	irrigation model crop coefficients net radiation soil heat flu Valdés-Gómez,Héctor Ortega-Farías,Samuel Argote,Mauricio Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
description	The Priestley-Taylor (PT) model was evaluated for estimating the real evapotranspiration (ETreal) of a drip-irrigated greenhouse tomato (Lycopersicon esculentum Mill.) crop. The net radiation incorporated in the PT model was estimated using meteorological variables. For this experiment, an automatic weather station (AWS) was installed inside the greenhouse to measure solar radiation (Rgi), net radiation (Rn), air temperature (Ta) and relative humidity (RH). Another AWS was installed over a grass cover to measure atmospheric conditions outside the greenhouse. The experiment was carried out at the Panguilemo experimental station (35°23’ S, 71°40’ W, 110 m.a.s.l.) from August to December 2000. The PT model was evaluated using the ETreal obtained from the water balance (WB) method. In this case, values of ETreal by PT model were calculated using: a) Rgi and soil heat flux (G) = 0; b) Rgi and G ≠ 0; c) solar radiation measured outside the greenhouse (Rge) and G = 0; and d) Rge and G ≠ 0. For these cases, results indicated that PT model was able to compute ETreal with errors less than 5%. Also, Rn was calculated with a relative absolute error and a mean deviation lower than 6% and 0.07 mm d-1, respectively, using Rgi or Rge. Daily soil heat flux values equal to zero did not affect the calculation of ETreal values. Thus, the PT model evaluated in this study could be used for scheduling irrigation for a greenhouse tomato crop, using internal measurements of air temperature and relative humidity, and external measurements of solar radiation. In this case, PT model predicted the ETreal with an error of 6.1%.
author	Valdés-Gómez,Héctor Ortega-Farías,Samuel Argote,Mauricio
author_facet	Valdés-Gómez,Héctor Ortega-Farías,Samuel Argote,Mauricio
author_sort	Valdés-Gómez,Héctor
title	Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
title_short	Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
title_full	Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
title_fullStr	Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
title_full_unstemmed	Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method
title_sort	evaluation of the water requirements for a greenhouse tomato crop using the priestley-taylor method
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100001
work_keys_str_mv	AT valdesgomezhector evaluationofthewaterrequirementsforagreenhousetomatocropusingthepriestleytaylormethod AT ortegafariassamuel evaluationofthewaterrequirementsforagreenhousetomatocropusingthepriestleytaylormethod AT argotemauricio evaluationofthewaterrequirementsforagreenhousetomatocropusingthepriestleytaylormethod
_version_	1714205264895279104

Evaluation of the Water Requirements for a Greenhouse Tomato Crop using the Priestley-Taylor Method

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