Determination of phloem sap flow rate using a combination of the heat balance method and girdling in citrus

Nakano, Yuuki; Iwasaki, Naoko

doi:10.1016/j.agrformet.2019.107669

Cited by 5 publications

(11 citation statements)

References 28 publications

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“…Close relationships between air temperature and the course of cambial activity, as well as the amount of xylem produced, were observed in previous studies [44][45][46]. Decreased cambium activity due to drought can be quickly restored by increasing the water content in the available soil profile [47].…”

Section: Discussionsupporting

confidence: 69%

“…Zha et al [43] interpret precipitation as the most important source of soil moisture; thus, walnut trees require a large volume of water supply during periods of low precipitation when the sap flow movement in the xylem tissue is slower. Sap flow during the budding period began to increase in the irrigated variant as a result of an increase in the volume of water in the tissue, and its value subsequently slowly decreased [44]. The highest daily air temperature of 19.2 • C was reached at 4 p.m.…”

Section: Discussionmentioning

confidence: 97%

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Water Regime Monitoring of the Royal Walnut (Juglans regia L.) Using Sap Flow and Dendrometric Measurements

Bárek

Kovacova

Kišš

et al. 2021

Plants

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Changes in the distribution of annual rainfall totals, together with the increase in temperature over the last 40 years, are causing more frequent periods of drought, and plants are more often exposed to water stress. The aim of this study was to monitor the effect of different water regimes (irrigated and non-irrigated) of individuals of walnut tree (Juglans regia L.) in a private orchard located in the West of Slovakia. Our research was focused on dendrometric and sap flow measurements in the period from 28 March to 2 June 2019. The results showed differences in the sap flow of walnut trees during the budbreak period: when trees were irrigated, sap flow in the diurnal cycle was around 130 g·h−1 (20.48%), higher than in the non-irrigated treatment. Dendrometric differences between the irrigated and non-irrigated treatments were not significant. The sap flow data in the flowering period of the irrigated variant were slightly higher at 150 g·h−1 (35.62%) than non-irrigated. Dendrometric differences were more significant when the difference between the variants was more than 1.5 mm. Continuation of this research and analysis of the data obtained in the coming years will allow us to evaluate the effects of the environment on fruit trees in the long term.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 97%

Water Regime Monitoring of the Royal Walnut (Juglans regia L.) Using Sap Flow and Dendrometric Measurements

Bárek

Kovacova

Kišš

et al. 2021

Plants

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“…Remote sensing methods can be classified under multiple criteria and, in this work, they have been categorized according to the part of the plant subjected to measurement. In this way, the different sensors used in the available literature can be applied to the soil [9][10][11][12][13][14][15][16][17], directly to the canopy or to different organs of individual plants, such as leaves or trunks and stems [71][72][73][74][75][76][77][78][79][80][81][82][83][84][85].…”

Section: Introductionmentioning

confidence: 99%

“…It is noteworthy to highlight that these approaches cannot be strictly considered as remote sensing techniques in spite of their widespread use in this research field. Other studies describe methods that need contact with the trunk or stems to develop the monitoring function [75,[78][79][80]. Among the main sensors that estimate the tree water status include coaxial probes called portable dielectric probes (PDP) [71][72][73][74][75], volumetric soil water content (VSWC) sensors inserted into tree trunks [76], sap-flow measurements based on sensors that measure sap-flow rate (SFR) (g•h -1 ) [78][79][80] or sap-flux density (SFD) (m 3 •m -2 •h -1 ) [77,81], CW vector network analyzer (VNA) spectroscopy [82,83], portable low-power cost-effective FMCW radars [84] and portable nuclear magnetic resonance (NMR) sensors [85].…”

Section: Introductionmentioning

confidence: 99%

“…Other studies describe methods that need contact with the trunk or stems to develop the monitoring function [75,[78][79][80]. Among the main sensors that estimate the tree water status include coaxial probes called portable dielectric probes (PDP) [71][72][73][74][75], volumetric soil water content (VSWC) sensors inserted into tree trunks [76], sap-flow measurements based on sensors that measure sap-flow rate (SFR) (g•h -1 ) [78][79][80] or sap-flux density (SFD) (m 3 •m -2 •h -1 ) [77,81], CW vector network analyzer (VNA) spectroscopy [82,83], portable low-power cost-effective FMCW radars [84] and portable nuclear magnetic resonance (NMR) sensors [85]. In relation to the parameters measured by these sensors, PDPs, by using the complex reflection coefficient, estimate the complex xylem dielectric constant (XDC) to be correlated with the xylem SFD, the xylem sap chemical composition and xylem water potential (XWP).…”

Section: Introductionmentioning

confidence: 99%

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Remote Sensing for Plant Water Content Monitoring: A Review

et al. 2021

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This paper reviews the different remote sensing techniques found in the literature to monitor plant water status, allowing farmers to control the irrigation management and to avoid unnecessary periods of water shortage and a needless waste of valuable water. The scope of this paper covers a broad range of 77 references published between the years 1981 and 2021 and collected from different search web sites, especially Scopus. Among them, 74 references are research papers and the remaining three are review papers. The different collected approaches have been categorized according to the part of the plant subjected to measurement, that is, soil (12.2%), canopy (33.8%), leaves (35.1%) or trunk (18.9%). In addition to a brief summary of each study, the main monitoring technologies have been analyzed in this review. Concerning the presentation of the data, different results have been obtained. According to the year of publication, the number of published papers has increased exponentially over time, mainly due to the technological development over the last decades. The most common sensor is the radiometer, which is employed in 15 papers (20.3%), followed by continuous-wave (CW) spectroscopy (12.2%), camera (10.8%) and THz time-domain spectroscopy (TDS) (10.8%). Excluding two studies, the minimum coefficient of determination (R2) obtained in the references of this review is 0.64. This indicates the high degree of correlation between the estimated and measured data for the different technologies and monitoring methods. The five most frequent water indicators of this study are: normalized difference vegetation index (NDVI) (12.2%), backscattering coefficients (10.8%), spectral reflectance (8.1%), reflection coefficient (8.1%) and dielectric constant (8.1%).

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Tracking of fluorescent antibiotic conjugate in planta utilizing fluorescence lifetime imaging

Miller

Parente

Santra

et al. 2021

Planta

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Determination of phloem sap flow rate using a combination of the heat balance method and girdling in citrus

Cited by 5 publications

References 28 publications

Water Regime Monitoring of the Royal Walnut (Juglans regia L.) Using Sap Flow and Dendrometric Measurements

Water Regime Monitoring of the Royal Walnut (Juglans regia L.) Using Sap Flow and Dendrometric Measurements

Remote Sensing for Plant Water Content Monitoring: A Review

Tracking of fluorescent antibiotic conjugate in planta utilizing fluorescence lifetime imaging

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