Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions
There is scarce knowledge on what are the actual water requirements of persimmon trees (Diospyros kaki). Research on this topic is required to better adjust irrigation water supplies to the actual crop water needs. This study aimed to determine the transpiration coefficients (K) of persimmon ‘Rojo Brillante’ trees and assess how transpiration and K are influenced by environmental factors and the atmospheric demand under Mediterranean climatic conditions. This was done over the course of three growing seasons by means of sap flow measurements calibrated with whole canopy gas exchange chambers. Irrigation was applied aiming to avoid water limiting conditions for trees. This was verified by monitoring the trees’ water status across the growing seasons. Sap flow measurements were linearly and highly correlated (p < 0.001) with canopy transpiration (E) obtained with the whole canopy chambers, but either overestimated or underestimated it. E increased from April until June-July in response to canopy development and increased midday canopy light interception. There was a positive linear relationship between daily E, reference evapotranspiration (ET) and solar radiation. However, a non-linear relationship was obtained between E and vapor pressure deficit (VPD). A positive non-linear relationship (p < 0.01) was observed between K (E / ET in non-limited water conditions) and VPD, illustrating the low stomatal regulation that persimmon trees exhibit in response to air dryness. K varied over the growing seasons following the ET pattern although showing comparatively a slighter decrease during the last part of the growing season. From June to September, K of persimmon ‘Rojo Brillante’ trees with a midday photosynthetically active radiation (PAR) intercepted of ~30 % ranged from 0.45 to 0.56. A strong relationship was obtained between K and percentage of midday intercepted PAR that can be used to estimate K of persimmon ‘Rojo Brillante’ trees with a range of ground canopy covers. This information is useful for deriving specific water use models for persimmon trees to be implemented in decision support systems. The monthly transpiration coefficients here provided will be useful for optimizing irrigation scheduling decisions in persimmon orchards and therefore irrigation water management.
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Elsevier
2022-09-01
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Subjects: | Canopy gas exchange, Photosynthetically active radiation, Sap flow, ‘Rojo Brillante’ persimmon trees, Transpiration, |
Online Access: | http://hdl.handle.net/10261/284250 http://dx.doi.org/10.13039/501100011033 |
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dig-ias-es-10261-2842502022-12-01T12:22:52Z Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions Ballester, Carlos Badal, Eduardo Bonet, L. Testi, Luca Intrigliolo, Diego S. Instituto Valenciano de Investigaciones Agrarias Ministerio de Ciencia, Innovación y Universidades (España) Agencia Estatal de Investigación (España) Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration There is scarce knowledge on what are the actual water requirements of persimmon trees (Diospyros kaki). Research on this topic is required to better adjust irrigation water supplies to the actual crop water needs. This study aimed to determine the transpiration coefficients (K) of persimmon ‘Rojo Brillante’ trees and assess how transpiration and K are influenced by environmental factors and the atmospheric demand under Mediterranean climatic conditions. This was done over the course of three growing seasons by means of sap flow measurements calibrated with whole canopy gas exchange chambers. Irrigation was applied aiming to avoid water limiting conditions for trees. This was verified by monitoring the trees’ water status across the growing seasons. Sap flow measurements were linearly and highly correlated (p < 0.001) with canopy transpiration (E) obtained with the whole canopy chambers, but either overestimated or underestimated it. E increased from April until June-July in response to canopy development and increased midday canopy light interception. There was a positive linear relationship between daily E, reference evapotranspiration (ET) and solar radiation. However, a non-linear relationship was obtained between E and vapor pressure deficit (VPD). A positive non-linear relationship (p < 0.01) was observed between K (E / ET in non-limited water conditions) and VPD, illustrating the low stomatal regulation that persimmon trees exhibit in response to air dryness. K varied over the growing seasons following the ET pattern although showing comparatively a slighter decrease during the last part of the growing season. From June to September, K of persimmon ‘Rojo Brillante’ trees with a midday photosynthetically active radiation (PAR) intercepted of ~30 % ranged from 0.45 to 0.56. A strong relationship was obtained between K and percentage of midday intercepted PAR that can be used to estimate K of persimmon ‘Rojo Brillante’ trees with a range of ground canopy covers. This information is useful for deriving specific water use models for persimmon trees to be implemented in decision support systems. The monthly transpiration coefficients here provided will be useful for optimizing irrigation scheduling decisions in persimmon orchards and therefore irrigation water management. This research was funded by the Valencian Institute of Agricultural Research (IVIA), Spain, and “Denominación de origen Kaki Ribera del Xuquer”, Spain, via “Proyecto Integral Caqui”. Complementary funds from the project Preciriego grant number RTC-2017-6365-2 funded by AEI-Feder, Spain, are also acknowledged. 2022-11-30T13:50:03Z 2022-11-30T13:50:03Z 2022-09-01 2022-11-30T13:50:03Z artículo doi: 10.1016/j.agwat.2022.107804 issn: 0378-3774 Agricultural Water Management 271: 107804 (2022) http://hdl.handle.net/10261/284250 10.1016/j.agwat.2022.107804 http://dx.doi.org/10.13039/501100011033 #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement////RTC-2017-6365-2 http://dx.doi.org/10.1016/j.agwat.2022.107804 Sí none Elsevier |
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Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration |
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Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration Ballester, Carlos Badal, Eduardo Bonet, L. Testi, Luca Intrigliolo, Diego S. Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
description |
There is scarce knowledge on what are the actual water requirements of persimmon trees (Diospyros kaki). Research on this topic is required to better adjust irrigation water supplies to the actual crop water needs. This study aimed to determine the transpiration coefficients (K) of persimmon ‘Rojo Brillante’ trees and assess how transpiration and K are influenced by environmental factors and the atmospheric demand under Mediterranean climatic conditions. This was done over the course of three growing seasons by means of sap flow measurements calibrated with whole canopy gas exchange chambers. Irrigation was applied aiming to avoid water limiting conditions for trees. This was verified by monitoring the trees’ water status across the growing seasons. Sap flow measurements were linearly and highly correlated (p < 0.001) with canopy transpiration (E) obtained with the whole canopy chambers, but either overestimated or underestimated it. E increased from April until June-July in response to canopy development and increased midday canopy light interception. There was a positive linear relationship between daily E, reference evapotranspiration (ET) and solar radiation. However, a non-linear relationship was obtained between E and vapor pressure deficit (VPD). A positive non-linear relationship (p < 0.01) was observed between K (E / ET in non-limited water conditions) and VPD, illustrating the low stomatal regulation that persimmon trees exhibit in response to air dryness. K varied over the growing seasons following the ET pattern although showing comparatively a slighter decrease during the last part of the growing season. From June to September, K of persimmon ‘Rojo Brillante’ trees with a midday photosynthetically active radiation (PAR) intercepted of ~30 % ranged from 0.45 to 0.56. A strong relationship was obtained between K and percentage of midday intercepted PAR that can be used to estimate K of persimmon ‘Rojo Brillante’ trees with a range of ground canopy covers. This information is useful for deriving specific water use models for persimmon trees to be implemented in decision support systems. The monthly transpiration coefficients here provided will be useful for optimizing irrigation scheduling decisions in persimmon orchards and therefore irrigation water management. |
author2 |
Instituto Valenciano de Investigaciones Agrarias |
author_facet |
Instituto Valenciano de Investigaciones Agrarias Ballester, Carlos Badal, Eduardo Bonet, L. Testi, Luca Intrigliolo, Diego S. |
format |
artículo |
topic_facet |
Canopy gas exchange Photosynthetically active radiation Sap flow ‘Rojo Brillante’ persimmon trees Transpiration |
author |
Ballester, Carlos Badal, Eduardo Bonet, L. Testi, Luca Intrigliolo, Diego S. |
author_sort |
Ballester, Carlos |
title |
Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
title_short |
Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
title_full |
Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
title_fullStr |
Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
title_full_unstemmed |
Determining transpiration coefficients of ‘Rojo Brillante’ persimmon trees under Mediterranean climatic conditions |
title_sort |
determining transpiration coefficients of ‘rojo brillante’ persimmon trees under mediterranean climatic conditions |
publisher |
Elsevier |
publishDate |
2022-09-01 |
url |
http://hdl.handle.net/10261/284250 http://dx.doi.org/10.13039/501100011033 |
work_keys_str_mv |
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