A comparison of soil- and canopy temperature-based methods for the early detection of water stress in a simulated patch of pasture

1994 ◽  
Vol 14 (3) ◽  
pp. 141-146 ◽  
Author(s):  
Cecilia Stanghellini ◽  
Francesca De Lorenzi
Keyword(s):  
Water Stress ◽  
Early Detection ◽  
Canopy Temperature

The Effect of Water Shortage on Potted Peach Trees in Relation to Ecophysiological Parameters and Infra-red Thermometry

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 541b-541
Author(s):  
Rita Giuliani ◽  
James A. Flore
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Early Detection ◽  
Water Potential ◽  
Canopy Temperature ◽  
Water Shortage ◽  
Development Rate ◽  
Plant Water ◽  
Infra Red ◽  
Peach Trees

Potted peach trees grown outdoors during the 1997 season were subjected to drought and subsequent rewatering to evaluate their dynamic response to soil water content. The investigation was primarily focused on the early detection of plant water stress to prevent negative effects on the growth. Leaf chlorophyll fluorescence and canopy temperature estimates (by infra-red thermometry) were conducted. Drought effect on physiological processes were detected through by estimates of canopy development rate, leaf gas-exchange measurements; while leaf water potential was measured to characterize plant water status. A decrease in the canopy's development rate was found 1 week after irrigation was stopped, which also coincided with a more-negative leaf water potential, whereas a decrease of the gas-exchange activities occurred several days later. No significant differences between the stressed and control plants were recorded by the chlorophyll fluorescence parameters (Fo, Fm, Fv and the ratio Fv/Fm), whereas the infra-red estimates of canopy temperature detected a slight increase of the canopy surface temperature (connected to the change of leaf energy balance and in relation to partial stomatal closure) on the non-irrigated plants 1 week after the beginning of the trial. The use of infra-red thermometry for early detection of water shortage is discussed.

scholarly journals Water stress indices for the sugarcane crop on different irrigated surfaces

2016 ◽  
Vol 20 (10) ◽  
pp. 925-929 ◽  
Author(s):  
Rodrigo G. Brunini ◽  
José E. P. Turco
Keyword(s):  
Water Stress ◽  
Raw Materials ◽  
Irrigation System ◽  
Canopy Temperature ◽  
Ambient Air ◽  
Saccharum Officinarum ◽  
Stress Index ◽  
Stress Indices ◽  
Sugarcane Crop ◽  
Water Stress Index

ABSTRACT Sugarcane (Saccharum officinarum L.) is a crop of vital importance to Brazil, in the production of sugar and ethanol, power generation and raw materials for various purposes. Strategic information such as topography and canopy temperature can provide management technologies accessible to farmers. The objective of this study was to determine water stress indices for sugarcane in irrigated areas, with different exposures and slopes. The daily water stress index of the plants and the water potential in the soil were evaluated and the production system was analyzed. The experiment was carried out in an “Experimental Watershed”, using six surfaces, two horizontal and the other ones with 20 and 40% North and South exposure slopes. Water stress level was determined by measuring the temperatures of the vegetation cover and the ambient air. Watering was carried out using a drip irrigation system. The results showed that water stress index of sugarcane varies according to exposure and slope of the terrain, while areas whose water stress index was above 5.0 oC had lower yield values.

Early Detection of Plant Water Stress

2020 ◽  
Vol 12 (2) ◽  
pp. 145-154
Author(s):  
Mi-Ri Kim ◽  
Tae-Yun Kim ◽  
Joo-Ah Park ◽  
Ye-Jin Seo ◽  
En-Seo Jung ◽  
...  
Keyword(s):  
Water Stress ◽  
Early Detection ◽  
Plant Water ◽  
Plant Water Stress

scholarly journals Canopy Temperature Bias from Soil Variability Enhanced at High Temperatures

2020 ◽  
Vol 63 (1) ◽  
pp. 95-104
Author(s):  
Kendall C. DeJonge ◽  
Huihui Zhang ◽  
Saleh Taghvaeian ◽  
Thomas J. Trout
Keyword(s):  
Water Stress ◽  
Soil Texture ◽  
Irrigation Schedule ◽  
Canopy Temperature ◽  
Field Capacity ◽  
Soil Variability ◽  
List Type ◽  
Infrared Thermometry ◽  
Temperature Bias ◽  
Irrigation Treatments

HighlightMaize canopy temperature (Tc) was evaluated among four replicates of seven irrigation treatments.Individual replicates showed Tc bias correlated with soil electroconductivity and increasing Tc.At high Tc values (above 35°C), Tc bias was up to 5.0°C among plots with the same irrigation schedule.ABSTRACT. Maize canopy temperature was monitored on a continuous basis for two growing seasons in a limited-irrigation maize experiment with seven separate irrigation treatments and four replicates of each treatment. Soil electroconductivity (EC) was measured and mapped to quantify the variation in soil texture throughout the plots and was correlated with the average field capacity of the soil (R2 = 0.51). At lower canopy temperatures, indicating little or no water stress, very little difference was observed between replicates within the same treatment. However, at higher temperatures, soil texture had a greater influence on temperature, with soils having lower EC (and therefore lower water-holding capacity) showing more water stress. More specifically, at canopy temperatures above 29°C, the influence of soil texture biased the temperature by up to 2.0°C over the EC range of 16.9 to 40.2 mS m-1; at mean canopy temperatures of 35°C, this bias could be more than 5.0°C between field replicates. Results similar to the continuous infrared thermometry were found using nadir thermal images. This study demonstrates the importance of understanding the potential effects of soil variability on canopy temperature, which could have profound implications for spatially variable field-based management using thermal imaging or similar technologies. Keywords: Canopy temperature, Infrared thermometry, Limited irrigation, Soil variability.

scholarly journals Maize Canopy Temperature Extracted From UAV Thermal and RGB Imagery and Its Application in Water Stress Monitoring

2019 ◽  
Vol 10 ◽  
Author(s):  
Liyuan Zhang ◽  
Yaxiao Niu ◽  
Huihui Zhang ◽  
Wenting Han ◽  
Guang Li ◽  
...  
Keyword(s):  
Water Stress ◽  
Canopy Temperature ◽  
Stress Monitoring

scholarly journals Temperature Relationships of Peanut Leaf Canopy, Stem, and Fruit in Soil of Varying Temperature and Moisture

1985 ◽  
Vol 12 (2) ◽  
pp. 86-89 ◽  
Author(s):  
Timothy H. Sanders ◽  
Paul D. Blankenship ◽  
Richard J. Cole ◽  
Robert A. Hill
Keyword(s):  
Water Stress ◽  
Soil Temperature ◽  
Canopy Temperature ◽  
Plant Part ◽  
Individual Plant ◽  
Significant Information ◽  
Late Season ◽  
Peanut Plant ◽  
Plant Parts ◽  
Cooling Coils

Abstract Physiological processes of plants are affected by temperature and temperature variation of individual plant parts has been demonstrated to affect such physiological interactions as source-sink relationships. Determination of plant part temperatures in relation to the surrounding environment, especially during stress, may provide significant information relative to how plants respond to various stress environments. To determine peanut plant part temperatures in various environments, rainfall control research plots equipped either with heating cables or cooling coils were utilized to grow Florunner peanuts and implement treatments of various soil temperatures under water stress and irrigated conditions. Peanut stem and pod temperatures were monitored automatically at 2-hr intervals with attached and implanted thermocouples. Canopy temperatures, determined by infrared thermometry, were related to water stress but were apparently unrelated to varying soil tempertures. Late-season, afternoon (1:00 p.m.) canopy temperature in the irrigated treatment averaged 28.5 C and mean canopy temperatures in all water stressed treatments were 35±1 C. Late-season plant stem temperature/soil temperature means in irrigated, water stressed-heated soil, water stressed, and water stressed-cooled soil treaments were 21.6 C/21.6 C, 25.2 C/30.2 C, 25.0 C/ 25.C, and 23.3 C/ 20.6 C, respectively. Peanut pod temperatures ranged higher and lower than soil temperature in each plot and maximum pod temperatures often occurred earlier than maximum soil temperature. Concurrent pod, stem, and air maximum and minimum temperatures suggest the strong influence of aerial plant-part temperatures on temperatures of the subterranean fruit. The results of this study show the effect of moisture and temperature stress on peanut plant part temperatures and demonstrate the relationships which result from the unique subterranean fruiting habit.

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