Plant Temperatures<sup>1</sup>

Tanner, C. B.

doi:10.2134/agronj1963.00021962005500020043x

Cited by 254 publications

(102 citation statements)

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“…The use of remote sensing in the assessment of crop water status through canopy temperature has had a long development history. In the 1970s and 1980s, canopy temperature was first suggested as a method to detect stress using hand-held thermal infrared thermometers [6][7][8][9][10][11][12]. However, these measurements were site-specific and not useful to assess spatial distribution of water status within a field.…”

Section: Introductionmentioning

confidence: 99%

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

et al. 2016

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In the current scenario of worldwide limited water supplies, conserving water is a major concern in agricultural areas. Characterizing within-orchard spatial heterogeneity in water requirements would assist in improving irrigation water use efficiency and conserve water. The crop water stress index (CWSI) has been successfully used as a crop water status indicator in several fruit tree species. In this study, the CWSI was developed in three Prunus persica L. cultivars at different phenological stages of the 2012 to 2014 growing seasons, using canopy temperature measurements of well-watered trees. The CWSI was then remotely estimated using high-resolution thermal imagery acquired from an airborne platform and related to leaf water potential (Ψ L ) throughout the season. The feasibility of mapping within-orchard spatial variability of Ψ L from thermal imagery was also explored. Results indicated that CWSI can be calculated using a common non-water-stressed baseline (NWSB), upper and lower limits for the entire growing season and for the three studied cultivars. Nevertheless, a phenological effect was detected in the CWSI vs. Ψ L relationships. For a specific given CWSI value, Ψ L was more negative as the crop developed. This different seasonal response followed the same trend for the three studied cultivars. The approach presented in this study demonstrated that CWSI is a feasible method to assess the spatial variability of tree water status in heterogeneous orchards, and to derive Ψ L maps throughout a complete growing season. A sensitivity analysis of varying pixel size showed that a pixel size of 0.8 m or less was needed for precise Ψ L mapping of peach and nectarine orchards with a tree crown area between 3.0 to 5.0 m 2 .

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Section: Introductionmentioning

confidence: 99%

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

et al. 2016

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“…Tanner (1963), who found significant differences between the leaf and air temperature for *Contribution from the Coastal Plains Soil and Water Conservation Research Center, Southern Region, USDA-SEA-AR, Florence, S.C. 29502, in cooperation with the South Carolina Agric. Expt.…”

Section: Introductionmentioning

confidence: 99%

Canopy air temperatures and evapotranspiration from irrigated and stressed soybeans

Reicosky

Deaton

Parsons

1980

Agricultural Meteorology

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Soil-water stress as it affects the plant-water status and crop production is becoming increasingly important. When soil-water stress is severe, partial closure of the stomates causes a repartitioning of the incident energy, often resulting in increased temperatures. The effect of soil-water stress on air temperatures within a soybean canopy was studied and the increased air temperatures related to decreased evapotranspiration and plantwater stress. One treatment of soybeans was trickle-irrigated when the matric potential at the 15-cm depth was equal to --0.2 bar. Air-temperature profiles were measured in both irrigated and nonirrigated field-grown soybeans, using calibrated thermistors. Evapotranspiration was measured using a portable chamber. Plant-water status was evaluated indirectly through the use of LVDT's (linear variable displacement transducers). The measured stem-diameter changes were related to the air temperature differences in the irrigated and nonirrigated canopies. The data showed as soil-water stress became more severe, canopy air temperatures within nonirrigated soybeans increased above those within the irrigated soybean canopy. The above-canopy minus the within-canopy temperature difference between the irrigated and nonirrigated plots increased during peak radiation with little difference at night. When the plant-wilt symptoms indicated severe stress, evapotranspiration decreased 40--70% when within-canopy air temperatures increased. This increase in the canopy air temperature was related to stem-diameter shrinkage and may be an indirect measure of the plant-water status under field conditions.

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“…Quantifying drought stress by measuring leaf/canopy temperature has become subject of intensive research within the last decades (Tanner, 1963;Wiegand, 1966). In the 1960ies researchers first used crude infrared thermometers to remotely monitor leaf temperature (Fuchs & Tanner, 1966).…”

Section: Drought Stress Detection By Thermal Infraredmentioning

confidence: 99%

Drought Stress and the Need for Drought Stress Sensing in a World of Global Climate Change

Linke¹

2012

Irrigation Systems and Practices in Challenging Environments

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Plant Temperatures¹

Cited by 254 publications

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Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

Canopy air temperatures and evapotranspiration from irrigated and stressed soybeans

Drought Stress and the Need for Drought Stress Sensing in a World of Global Climate Change

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Plant Temperatures1

Cited by 254 publications

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Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

Airborne Thermal Imagery to Detect the Seasonal Evolution of Crop Water Status in Peach, Nectarine and Saturn Peach Orchards

Canopy air temperatures and evapotranspiration from irrigated and stressed soybeans

Drought Stress and the Need for Drought Stress Sensing in a World of Global Climate Change

Contact Info

Product

Resources

About

Plant Temperatures¹