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Optimal irrigation management for avocado (cv. 'Hass') trees by monitoring soil water content and plant water status
Indexado
WoS WOS:000831063900003
Scopus SCOPUS_ID:85134681675
DOI 10.1016/J.AGWAT.2022.107794
Año 2022
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



Irrigation scheduling based on soil water content (Ow) sensors requires that Ow be maintained within a range (management lines) that is optimal for plant growth. The lower limit or "breaking point " is determined following the soil water content dynamics on the transition of a rapid rate of depletion to a slower, under similar reference evapotranspiration. Although this criterion is practical, its implementation should be validated with plant water status measurement that contemplate weather condition, such as stem water potential "non-stressed " baseline (Tx as a function of vapor-pressure deficit (VPD) in Ow conditions that do not limit yield). A study was con-ducted on a mature cv. 'Hass' avocado orchard in Central Chile during two seasons. There were 5 irrigation treatments: T1, Control; T2 and T3 with 29% less and 25% more of what was applied in T1, respectively; T4 and T5 same as Control until first and second fruit drop abscission, respectively, and then with 29% less. T1 trees were irrigated using a continuous frequency domain reflectometry (FDR) probe to maintain the root zone be-tween field capacity and the breaking point. There was biweekly monitoring of the Ow prior to irrigation, Tx and VPD. The Tx decline proportional to the intensity and the timing of water restriction; however, no treatment affected the crop load in either season. T2 did not show significant detrimental in fruit size, production and maturation, despite that frequently reached water content levels at the limit of the breaking point, and showed lower levels of stem water potential than Control, being the treatment with the highest water productivity. The results confirm that breaking point is an effective criterion to establish irrigation management. Additionally, when comparing the baseline for our non-stressed trees with a baseline from full irrigation treatments obtained from the literature, 30% water savings were achieved.

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Disciplinas de Investigación



WOS
Agronomy
Water Resources
Scopus
Sin Disciplinas
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Beyá-Marshall, V. Hombre Universidad de Chile - Chile
2 Arcos, Emilia Mujer Universidad de Chile - Chile
3 SEGUEL-SEGUEL, OSCAR Hombre Universidad de Chile - Chile
4 GALLEGUILLOS-VEGA, MAURICIO ANDRES Hombre Universidad Adolfo Ibáñez - Chile
5 KREMER-FARINA, CRISTIAN Hombre Universidad de Chile - Chile

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Financiamiento



Fuente
O'Higgins Regional Government, Chile
O′Higgins Regional Government

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Agradecimientos



Agradecimiento
The authors wish to thank the O'Higgins Regional Government, Chile for funding this study as part of project FIC-R (IDI 30474710) . We also wish to thank Rodrigo Gomez and Jose Ortega (Agricola Comercial Huerto Los Molinos Ltda) and his team of professionals for granting access to the property where this study was conducted. The authors declare there is no conflict of interest with respect to the publication of this study.
The authors wish to thank the O′Higgins Regional Government , Chile for funding this study as part of project FIC-R ( IDI 30474710 ). We also wish to thank Rodrigo Gómez and José Ortega (Agrícola Comercial Huerto Los Molinos Ltda) and his team of professionals for granting access to the property where this study was conducted. The authors declare there is no conflict of interest with respect to the publication of this study.

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