TY - JOUR
T1 - Hourly relationship between reference evapotranspiration and shoot shrinkage in walnut trees and pomegranate under deficit irrigation
AU - Salgado, Eduardo
AU - Livellara, Nieggiorba
AU - Chaigneau, Esteban
AU - Varas, Fernando
AU - Cuneo, Italo F.
N1 - Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - Diameter fluctuations of branches, shoots, or fruits are related to plant transpiration and water potential. In the past, several models have related dendrometric variables and evapotranspi-ration on a daily scale. However, trunk–branch shrinkage occurs only between dawn and midday, while evapotranspiration occurs most of the day from sunrise to sunset. Previous models have failed to incorporate this key fact. The objective of the present study was to assess the relationship of hourly daily shrinkage (HDS) between dawn and the next 4 h to the hourly reference evapotranspiration (EToh) of the same period in walnut trees and pomegranate plants under different irrigation regimes. Our data show that the relationship between EToh and HDS is much better than several previous models that included maximum daily shrinkage (MDS) and reference evapotranspiration (ETo). The novel slope analysis of the relationship between HDS versus time used here corresponds to the velocity at which the HDS occurs, which depends on the ETo intensity at that moment. This new method of analyzing this type of data calls for a revision of these models and sets a new baseline for future analysis.
AB - Diameter fluctuations of branches, shoots, or fruits are related to plant transpiration and water potential. In the past, several models have related dendrometric variables and evapotranspi-ration on a daily scale. However, trunk–branch shrinkage occurs only between dawn and midday, while evapotranspiration occurs most of the day from sunrise to sunset. Previous models have failed to incorporate this key fact. The objective of the present study was to assess the relationship of hourly daily shrinkage (HDS) between dawn and the next 4 h to the hourly reference evapotranspiration (EToh) of the same period in walnut trees and pomegranate plants under different irrigation regimes. Our data show that the relationship between EToh and HDS is much better than several previous models that included maximum daily shrinkage (MDS) and reference evapotranspiration (ETo). The novel slope analysis of the relationship between HDS versus time used here corresponds to the velocity at which the HDS occurs, which depends on the ETo intensity at that moment. This new method of analyzing this type of data calls for a revision of these models and sets a new baseline for future analysis.
KW - Dendrometry
KW - Hourly reference evapotranspiration
KW - Hourly shrinkage
KW - Irrigation scheduling
KW - Linear regression analysis
KW - Tree water relations
UR - http://www.scopus.com/inward/record.url?scp=85121610321&partnerID=8YFLogxK
U2 - 10.3390/plants11010031
DO - 10.3390/plants11010031
M3 - Article
AN - SCOPUS:85121610321
SN - 2223-7747
VL - 11
JO - Plants
JF - Plants
IS - 1
M1 - 31
ER -