Soil and plant water indicators for deficit irrigation management of field-grown sweet cherry trees

Blanco, Víctor María Fernández; Miguel, Rafael Domingo; Pérez‐Pastor, Alejandro; Blaya-Ros, Pedro José; Torres-Sánchez, Roque

doi:10.1016/j.agwat.2018.05.021

Cited by 62 publications

(55 citation statements)

References 56 publications

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“…These authors reported that the contribution of the soil and atmosphere components to Ψ stem differed according to the intensity of the water deficit imposed in each irrigation treatment. Blanco et al [82] also proposed a multiple linear regression equation based on average soil water tension and mean VPD for estimating Ψ stem in sweet cherry trees.…”

Section: Role Of Ndvi Savi and Tc-ta Indexesmentioning

confidence: 99%

Terrestrial and Remote Indexes to Assess Moderate Deficit Irrigation in Early-Maturing Nectarine Trees

et al. 2019

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Monitoring plant water status is relevant for the sustainable management ofirrigation under water deficit conditions. Two treatments were applied to an early-maturingnectarine orchard: control (well irrigated) and precise deficit irrigation (PDI, based on soilwater content thresholds). Moderate water deficits generated by PDI were assessed bycomparing terrestrial: stem water potential (Ψstem) and gas exchange parameters, with remote:canopy temperature, normalized difference vegetation (NDVI), and soil adjusted vegetationindex (SAVI), plant water status indicators. The Ψstem was the only indicator that showedsignificant differences between treatments. NDVI and SAVI at the postharvest period wereappropriate indexes for estimating winter pruning, although they did not serve well as plantstress indicator. Vapor pressure deficit along with Ψstem values were able to predict remotesensing data. Ψstem and canopy to air temperature difference values registered the highestsignal intensity and NDVI the highest sensitivity for detecting water deficit situations. Theresults suggest that care should be taken when using instantaneous remote indicators toevaluate moderate water deficits in deciduous fruit trees; more severe/longer water stressconditions are probably needed. The proposed PDI strategy promoted water saving whilemaintaining yield, and could be considered a promising tool for semi-arid agrosystems.

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Section: Role Of Ndvi Savi and Tc-ta Indexesmentioning

confidence: 99%

Terrestrial and Remote Indexes to Assess Moderate Deficit Irrigation in Early-Maturing Nectarine Trees

et al. 2019

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“…However, when dealing with DI in commercial orchards, implementing a water deficit based solely on the ET a /ET c ratio may contain significant errors. These errors are due to (a) possible inaccuracies on ET a and ET c estimations, (b) the lack of knowledge on the particular thresholds below which there is a reduction of transpiration due to water stress, and (c) the difficulty of achieving a spatially-homogenous, targeted soil, or plant water status across the orchard [22]. Spatial differences in soil type and depth, canopy architecture, and fruit load contribute to variations in plant water status within the orchard.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Crop Evapotranspiration and Crop Coefficients over an Almond and Pistachio Orchard Throughout Remote Sensing

et al. 2018

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In California, water is a perennial concern. As competition for water resources increases due to growth in population, California's tree nut farmers are committed to improving the efficiency of water used for food production. There is an imminent need to have reliable methods that provide information about the temporal and spatial variability of crop water requirements, which allow farmers to make irrigation decisions at field scale. This study focuses on estimating the actual evapotranspiration and crop coefficients of an almond and pistachio orchard located in Central Valley (California) during an entire growing season by combining a simple crop evapotranspiration model with remote sensing data. A dataset of the vegetation index NDVI derived from Landsat-8 was used to facilitate the estimation of the basal crop coefficient (K cb ), or potential crop water use. The soil water evaporation coefficient (K e ) was measured from microlysimeters. The water stress coefficient (K s ) was derived from airborne remotely sensed canopy thermal-based methods, using seasonal regressions between the crop water stress index (CWSI) and stem water potential (Ψ stem ). These regressions were statistically-significant for both crops, indicating clear seasonal differences in pistachios, but not in almonds. In almonds, the estimated maximum K cb values ranged between 1.05 to 0.90, while for pistachios, it ranged between 0.89 to 0.80. The model indicated a difference of 97 mm in transpiration over the season between both crops. Soil evaporation accounted for an average of 16% and 13% of the total actual evapotranspiration for almonds and pistachios, respectively. Verification of the model-based daily crop evapotranspiration estimates was done using eddy-covariance and surface renewal data collected in the same orchards, yielding an R 2 ≥ 0.7 and average root mean square errors (RMSE) of 0.74 and 0.91 mm·day −1 for almond and pistachio, respectively. It is concluded that the combination of crop evapotranspiration models with remotely-sensed data is helpful for upscaling irrigation information from plant to field scale and thus may be used by farmers for making day-to-day irrigation management decisions.

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“…Canopy temperature is one of the plant water status indicators that has recently become popular due to the development of infrared thermometry [6,7]. In the last few years, the use of canopy temperature for irrigation scheduling has been tested in several fruit tree crops, including cherry [8,9] avocado [10], almond [11], nectarine [12], peach [13] and also citrus trees such as lemon [14,15]. However, less information is available concerning lime.Shading, which aims to protect crops against abiotic stresses such as high air temperature or excessive solar radiation, is regarded as a good cropping technique to cope with climatic change.…”

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confidence: 99%

Leaf Water Relations in Lime Trees Grown under Shade Netting and Open-Air

Mira-García

Conejero

Vera

et al. 2020

Plants

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Physiological plant water status indicators are useful for managing precision irrigation in regions with limited water resources. The aim of this work was to evaluate the effect of shade netting on the diurnal and seasonal variations of several plant water status indicators in young lime trees (Citrus latifolia Tan., cv. Bearss), grown at the CEBAS-CSIC experimental station in Murcia, Spain. Stem water potential (Ψ stem ), leaf gas exchange (net photosynthesis (P n ) and stomatal conductance (g s )), and canopy temperature (T c ) were measured on representative days of winter and summer. The Ψ stem daily pattern was quite similar in both seasons under both conditions. However, the circadian rhythm of leaf gas exchange was affected by shade conditions, especially in summer, when shaded leaves showed maximum g s values for a longer time, allowing higher net photosynthesis (37%). Canopy temperature behaved similarly in both conditions, nevertheless, lower values were recorded in open-air than in shaded trees in the two seasons. The canopy-to-air temperature difference (T c − T a ), however, was lower in shaded trees during the daylight hours, indicating the higher degree of leaf cooling that was facilitated by high g s values. The possibility of continuously recording T c makes it (or the proposed canopy thermal index, CTI) a promising index for precise irrigation scheduling. Shade netting was seen to favour gas exchange, suggesting that it may be considered alternative to open-air for use in semi-arid areas threatened by climate change.Plants 2020, 9, 510 2 of 14 that integrates the soil and atmosphere water status, as well as measuring the physiological response to the water available in the soil. The most commonly used are the conventional, non-automated methods for measuring leaf or stem water potential, stomatal conductance or photosynthesis, and automated methods for measuring sap flow, canopy temperature, trunk diameter, or leaf turgor pressure [6]. Canopy temperature is one of the plant water status indicators that has recently become popular due to the development of infrared thermometry [6,7]. In the last few years, the use of canopy temperature for irrigation scheduling has been tested in several fruit tree crops, including cherry [8,9] avocado [10], almond [11], nectarine [12], peach [13] and also citrus trees such as lemon [14,15]. However, less information is available concerning lime.Shading, which aims to protect crops against abiotic stresses such as high air temperature or excessive solar radiation, is regarded as a good cropping technique to cope with climatic change. This is likely due to the net increases light scattering, thus reducing radiation and creating an optimal microclimate for crop development [16]. As several studies have pointed out [17,18], shaded conditions affect agrometeorological variables, such as relative humidity, wind velocity and canopy and soil temperatures. Additionally, changes in the microclimate can modify physiological water status indicators. Many authors have pointe...

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Soil and plant water indicators for deficit irrigation management of field-grown sweet cherry trees

Cited by 62 publications

References 56 publications

Terrestrial and Remote Indexes to Assess Moderate Deficit Irrigation in Early-Maturing Nectarine Trees

Terrestrial and Remote Indexes to Assess Moderate Deficit Irrigation in Early-Maturing Nectarine Trees

Monitoring Crop Evapotranspiration and Crop Coefficients over an Almond and Pistachio Orchard Throughout Remote Sensing

Leaf Water Relations in Lime Trees Grown under Shade Netting and Open-Air

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