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Título: | Trunk dielectric permittivity correlates with irrigation based on soil water content in fruit trees |
Autor: | Conesa, María R.; Vera Muñoz, Juan CSIC ORCID ; Conejero Puente, Wenceslao CSIC ORCID CVN ; Hernández Santana, V.; Ruiz Sánchez, M. Carmen CSIC ORCID | Palabras clave: | Automatic soil-based irrigation system Dielectric permittivity (k) Management allowed depletion (MAD) Volumetric trunk water content (θv-trunk) TDR-305N volumetric soil water content (θv-soil) |
Fecha de publicación: | mar-2024 | Editor: | Elsevier | Citación: | Smart Agricultural Technology 7: 100428 (2024 | Resumen: | Time-domain reflectometry (TDR) is an electromagnetic technique that measures the dielectric permittivity (K) which is a surrogate property influenced by water content. Advances in nanoelectronics have enabled the development of a TDR probe (TDR-305 N) to monitor changes in K, bulk electrical conductivity (ECbulk) and temperature (T) in a porous medium, such as a tree trunk. The main objective of this study was to assess the effectiveness of the TDR-305 N sensors for real-time monitoring changes in water content in the trunk of nectarine trees. Throughout the summer of 2022, irrigation was automatically managed with threshold values of soil water content (θv-soil) measured with capacitance probes. Different management allowed depletion (MAD) values were set to trigger irrigation: 50 % in July (moderate water deficit), 100 % in August (severe water deficit), and recovery to well-irrigated conditions in September. Discrete measurements of midday stem water potential (Ψs,md) and leaf gas exchange were made frequently. The results showed a progressive reduction of the measured physiological parameters, as well as of K and ECbulk and θv-soil decreased. Notably, Ψs,md reached a critically low value of -2.03 MPa, coinciding with pronounced and severe stomatal closure. Both K and Ψs,md, were able to explain the variations of θv-soil by more than 75 %. Daily, a positive relationship of K and ECbulk was observed, although ECbulk exhibited a stronger dependence on Ttrunk compared to K. Furthermore, K did not return to its initial values prior to the onset of water stress, possibly influenced by xylem cavitation and a reduction in leaf area during its senescence stage. The findings suggest that trunk permittivity measurements obtained using TDR-305 N sensors could be a reliable indicator for monitoring tree water status. However, further research is needed to determine the threshold values of trunk water content under non-limiting soil water conditions for accurate irrigation scheduling. | Descripción: | 10 páginas.- 9 figuras.- 2 ilustraciones.- 1 tabla.- 62 referencias.- | Versión del editor: | http://hdl.handle.net/10.1016/j.atech.2024.100428 | URI: | http://hdl.handle.net/10261/350666 | DOI: | 10.1016/j.atech.2024.100428 | ISSN: | 2772-3755 |
Aparece en las colecciones: | (IRNAS) Artículos (CEBAS) Artículos |
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