Assessment of trunk diameter variation derived indices as water stress indicators in mature olive trees

Cuevas, M.V.; Torres‐Ruiz, José M.; Álvarez, R.; Jiménez, Manuel; Cuerva, J.; Fernández, J.E.

doi:10.1016/j.agwat.2010.03.011

Cited by 62 publications

(32 citation statements)

References 46 publications

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“…Some species such as grapevine may show isohydric or anisohydric behaviour, depending on the water stress conditions [29,36]. For other species, such as olive, a near-isohydric behaviour has been described, since they are able to keep relatively stable leaf water potentials but not as effectively as isohydric plants [37]. In the case of plants with isohydric behaviour, a significant decrease of g s occurs during the day while leaf water potential remains constant.…”

Section: Daily Growth Dg µMmentioning

confidence: 99%

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

131

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Abstract:The increasing world population and expected climate scenarios impel the agricultural sector towards a more efficient use of water. The scientific community is responding to that challenge by developing a variety of methods and technologies to increase crop water productivity. Precision irrigation is intended to achieve that purpose, through the wise choice of the irrigation system, the irrigation strategy, the method to schedule irrigation, and the production target. In this review, the relevance of precision irrigation for a rational use of water in agriculture, and methods related to the use of plant-based measurements for both the assessment of plant water stress and irrigation scheduling, are considered. These include non-automated, conventional methods based on manual records of plant water status and gas exchange, and automated methods where the related variable is recorded continuously and automatically. Thus, the use of methodologies based on the Scholander chamber and portable gas analysers, as well as those of systems for measuring sap flow, stem diameter variation and leaf turgor pressure, are reviewed. Other methods less used but with a potential to improve irrigation are also considered. These include those based on measurements related to the stem and leaf water content, and to changes in electrical potential within the plant. The use of measurements related to canopy temperature, both for direct assessment of water stress and for defining zones with different irrigation requirements, is also addressed. Finally, the importance of choosing the production target wisely, and the need for economic analyses to obtain maximum benefit of the technology related to precision irrigation, are outlined.

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Section: Daily Growth Dg µMmentioning

confidence: 99%

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

131

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“…Rallo and Suarez (1989) observed that leaf length, number, and area as well as the dry weight of fruit-bearing branches increased rapidly in the spring with a plateau being reached approximately 60-100 days after bloom and little or no growth the rest of the season. Trunk growth may also slow sharply at about the same time (Cuevas et al, 2010), probably due to competition for assimilates with the fruit, which may be strong sinks after pit hardening (50-60 d after bloom). In contrast, Connor and Fereres (2005) have suggested that shoot elongation and leaf expansion may be maintained from spring to autumn if sufficient irrigation is provided.…”

Section: Introductionmentioning

confidence: 97%

Dynamics of shoot and fruit growth following fruit thinning in olive trees: Same season and subsequent season responses

Fernández

Ladux

Searles

2015

Scientia Horticulturae

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“…There is a substantial amount of literature on the usefulness of different methods for the continuous monitoring of crop water status, such as those based on the use of dendrometers (Moriana et al, 2010or Cuevas et al, 2010, sap-flow (Fernández et al, 2008a;Fernández, 2014a) or leaf turgor pressure probes (Zimmerman et al, 2008;Fernández et al, 2011a). Studies on their applicability to commercial orchards proved that additional information on crop-water status is often required to properly evaluate the information collected by those sensors (Fernández, 2014b).…”

Section: Introductionmentioning

confidence: 99%

Assessing plant water status in a hedgerow olive orchard from thermography at plant level

García-Tejero

Hernández

Padilla‐Díaz

et al. 2017

Agricultural Water Management

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a b s t r a c tWater scarcity is the most limiting factor in many irrigated areas of Mediterranean countries such as South Spain. Olive growing has been traditionally associated to rain-fed agriculture, although irrigation and practices related to intensive agriculture have been progressively introduced, requiring a more precise irrigation scheduling to save water. Thermal imaging is among the alternatives to assess the crop water status, especially when deficit irrigation (DI) strategies are applied. However, this technique requires of new advances to be more user friendly and robust for practical usage. The aims of this study were: i) to define threshold values of canopy temperature (T C ), Crop Water Stress Index (CWSI) and the temperature difference between canopy and the surrounding air ( T canopy-air ) for the assessment of the olive water status when a DI strategy is applied; ii) to define the best time of the day and the best area of the canopy to carry out thermal measurements, and iii) to obtain relationships between thermal indicators and main physiological parameters useful to estimate the crop water status from thermal data. The trial was conducted during 2015, in a hedgerow olive orchard (SW Spain) with 8-year-old trees (Olea europaea L., cv. Arbequina), under three irrigation regimes: a full-irrigation treatment (FI) and two regulated deficit irrigation treatments aimed to supplying 45% of the irrigation needs. In one of them, irrigation was scheduled from leaf turgor pressure related measurements (45RDI TP ). In the other, the crop coefficient approach was used to schedule irrigation (45RDI CC ). Significant correlations between Tc versus stem water potential (« st ) and leaf gas-exchange parameters (stomatal conductance to water vapour, g s ; net CO 2 assimilation, A N ; transpiration, E) were obtained (p ≤ 0.05), in particular from measurements taken at 10:30 GMT in the lower part of the sunlit side of the canopy. Moreover, the relationships between both T canopy-air and CWSI with the monitored physiological variables were very robust. We concluded that values of T canopy-air higher than 0 • C and values of CWSI up to 0.2 reliably reflect the plant water stress. Our results, therefore, suggest that both T canopy-air and CWSI measured at midday provide reliable information on the tree water status and are useful to schedule irrigation in hedgerow olive orchards, especially under DI conditions.

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Assessment of trunk diameter variation derived indices as water stress indicators in mature olive trees

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Cited by 62 publications

References 46 publications

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Dynamics of shoot and fruit growth following fruit thinning in olive trees: Same season and subsequent season responses

Assessing plant water status in a hedgerow olive orchard from thermography at plant level

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