Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees
Transpiration of well watered (C) and regulated deficit irrigated (RDI) trees was determined by means of the compensation heat pulse method during 2009 and 2010 in commercial citrus groves of 'Clementina de Nules' (CN) and 'Navel Lane Late' (NLL). In both species, sap flow (SF) was m...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | conferenceObject |
| Language: | Inglés |
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2017
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| Online Access: | http://hdl.handle.net/20.500.11939/4716 |
| _version_ | 1855032165716197376 |
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| author | Ballester, Carlos Castel, Juan R. Intrigliolo, Diego S. Castel, Juan R. Testi, Luca |
| author2 | Sebastiani, L Tognetti, R Motisi, A. |
| author_browse | Ballester, Carlos Castel, Juan R. Intrigliolo, Diego S. Sebastiani, L Tognetti, R Motisi, A. Testi, Luca |
| author_facet | Sebastiani, L Tognetti, R Motisi, A. Ballester, Carlos Castel, Juan R. Intrigliolo, Diego S. Castel, Juan R. Testi, Luca |
| author_sort | Ballester, Carlos |
| collection | ReDivia |
| description | Transpiration of well watered (C) and regulated deficit irrigated (RDI) trees was determined by means of the compensation heat pulse method during 2009 and 2010 in commercial citrus groves of 'Clementina de Nules' (CN) and 'Navel Lane Late' (NLL). In both species, sap flow (SF) was measured in two trees per treatment instrumented with two gauges per tree. CN trees were equipped with two different types of gauges (type1 shorter than type2) determining heat velocity from crossing time at four different xylem depths according to Green et al. (2003). In NLL oranges, all the gauges were identical and the data were processed according to the compensation heat pulse + calibrated average gradient (CAG) method (Testi and Villalobos, 2009). Plant water status was determined by midday stem water potential measurements (psi(stem)). Results showed that the absolute SF values, and especially those from type2 gauges in CN, clearly underestimated tree water use. Tree to tree variability registered in CN (CV=0.09) was lower than in NLL (CV=0.17) which also showed a 17% of within tree variability. The average nocturnal-to-diurnal sap flow ratio was between 7% and 13%. The evolution of relative SF (e. g. SFRDI/SFC) was in agreement with differences in psi(stem) (r(2)=0.78 in CN and 0.84 in NLL). This SF ratio showed the expected decreasing trend during the water restriction period and the recovery when irrigation was reestablished to normal dose. Overall, the results show that sap flow sensors can detect plant water stress but they also highlight some of the problems for accurately measuring transpiration. |
| format | conferenceObject |
| id | ReDivia4716 |
| institution | Instituto Valenciano de Investigaciones Agrarias (IVIA) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | ReDivia47162025-04-25T14:53:37Z Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees Acta Horticulturae Ballester, Carlos Castel, Juan R. Intrigliolo, Diego S. Castel, Juan R. Testi, Luca Sebastiani, L Tognetti, R Motisi, A. Transpiration of well watered (C) and regulated deficit irrigated (RDI) trees was determined by means of the compensation heat pulse method during 2009 and 2010 in commercial citrus groves of 'Clementina de Nules' (CN) and 'Navel Lane Late' (NLL). In both species, sap flow (SF) was measured in two trees per treatment instrumented with two gauges per tree. CN trees were equipped with two different types of gauges (type1 shorter than type2) determining heat velocity from crossing time at four different xylem depths according to Green et al. (2003). In NLL oranges, all the gauges were identical and the data were processed according to the compensation heat pulse + calibrated average gradient (CAG) method (Testi and Villalobos, 2009). Plant water status was determined by midday stem water potential measurements (psi(stem)). Results showed that the absolute SF values, and especially those from type2 gauges in CN, clearly underestimated tree water use. Tree to tree variability registered in CN (CV=0.09) was lower than in NLL (CV=0.17) which also showed a 17% of within tree variability. The average nocturnal-to-diurnal sap flow ratio was between 7% and 13%. The evolution of relative SF (e. g. SFRDI/SFC) was in agreement with differences in psi(stem) (r(2)=0.78 in CN and 0.84 in NLL). This SF ratio showed the expected decreasing trend during the water restriction period and the recovery when irrigation was reestablished to normal dose. Overall, the results show that sap flow sensors can detect plant water stress but they also highlight some of the problems for accurately measuring transpiration. 2017-06-01T10:10:49Z 2017-06-01T10:10:49Z 2012 2012 conferenceObject BallE., C., Castel, J., Intrigliolo, D.S., Castel, J.R., Testi, L. (2012). Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees. Viii International Symposium on Sap Flow, 951, 71-78. 0567-7572; 978-90-66053-58-8 http://hdl.handle.net/20.500.11939/4716 10.17660/ActaHortic.2012.951.7 en openAccess Impreso |
| spellingShingle | Ballester, Carlos Castel, Juan R. Intrigliolo, Diego S. Castel, Juan R. Testi, Luca Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title | Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title_full | Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title_fullStr | Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title_full_unstemmed | Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title_short | Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees |
| title_sort | sap flow measurements to assess regulated deficit irrigation strategies on citrus trees |
| url | http://hdl.handle.net/20.500.11939/4716 |
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