Relative Importance of Reradiation, Convection, and Transpiration in Heat Transfer from Plants

Idso, Sherwood B.; Baker, Donald G.

doi:10.1104/pp.42.5.631

Cited by 23 publications

(6 citation statements)

References 7 publications

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“…Clark and Hiler (1973) found leaf-air temperature difference to be complicated by solar irradiance level and less directly indicative of plant water stress. Idso and Baker (1967) concluded that reradiation and sensible heat flux were the major mechanisms of energy transfer for individual sunlit leaves, but cooling by transpiration dominated the energy balance for the canopy as a whole. This meant that if a reduction in transpiration is an indicator of plant water stress, then canopy temperature measurements were more indicative of stress than individual leaf measurements.…”

Section: Canopy and Leaf Temperature Sensingmentioning

confidence: 99%

Theory and Development of a VRI Decision Support System: The USDA-ARS ISSCADA Approach

Evett¹,

O’Shaughnessy²,

Andrade³

et al. 2020

Transactions of the ASABE

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HighlightsMulti-faceted research efforts converged to an automated irrigation decision support system (DSS).Low-cost, solar-powered, wireless plant abiotic and biotic stress sensors were developed to aid the DSS.Low-cost, accurate TDR soil water sensors and a wireless node and gateway system were developed for the DSS.Sensor systems and research-based algorithms were integrated into an automated irrigation DSS and control system.Abstract. Variable-rate irrigation (VRI) is now possible with every new center pivot irrigation system sold, either using sector (speed) control or both sector and zone (radial along the pipeline) control. However, decision support systems able to generate a prescription for spatially varying irrigation based on crop water need have lagged far behind VRI equipment. Irrigation based on crop water need has been shown to increase both crop water productivity and nutrient use efficiency, meaning that an effective VRI decision support system (DSS) could improve profitability while conserving resources. In this article, we report separately on a VRI DSS using sensor-based plant and soil water feedback as implemented in four U.S. states. This article describes the genesis and development of the Irrigation Scheduling Supervisory Control and Data Acquisition (ISSCADA) system, of the integral plant and soil sensors, and of its wireless sensor network subsystems, as well as the role of multi-location research efforts and cooperative research and development agreements in the development of the needed plant and soil sensors and the ISSCADA and wireless sensor network systems. Keywords: Crop water productivity, Decision support system, Product development, Sensors, Variable-rate irrigation, VRI.

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Section: Canopy and Leaf Temperature Sensingmentioning

confidence: 99%

Theory and Development of a VRI Decision Support System: The USDA-ARS ISSCADA Approach

Evett¹,

O’Shaughnessy²,

Andrade³

et al. 2020

Transactions of the ASABE

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“…Canopy temperature increases when solar radiation is absorbed [87] but, is cooled when latent energy or sweating is used to evaporate water instead of heating plant surfaces. Algorithms based on canopy temperature are strongly correlated with quantifiable crop yields [88], such as productivity, water use efficiency, seasonal evapotranspiration, leaf water potential at noon time, irrigation rates and damage caused by herbicides.…”

Section: Vegetation Indicesmentioning

confidence: 99%

Integrating Remote Sensing Data into Fuzzy Control System for Variable Rate Irrigation Estimates

Mendes¹,

Araújo²,

Er-Raki³

2019

Irrigation - Water Productivity and Operation, Sustainability and Climate Change

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Variable rate irrigation (VRI) is the capacity to vary the depth of water application in a field spatially. Developing precise management zones is necessary to efficient variable rate irrigation technologies. Intelligent fuzzy inference system based on precision irrigation knowledge, i.e., a system capable of creating prescriptive maps to control the rotation speed of the central pivot. Based on the VRI-prescribed map created by the intelligent system of decision-making, the pivot can increase or decrease its speed, reaching the desired depth of application in a certain irrigation zone. Therefore, this strategy of speed control is more realistic compared to traditional methods. Results indicate that data from the edaphoclimatic variables, when well fitted to the fuzzy logic, can solve uncertainties and non-linearities of an irrigation system and establish a control model for highprecision irrigation. Because remote sensing provides quick measurements and easy access to crop information for large irrigation areas, images will be used as inputs. The developed fuzzy system for pivot control is original and innovative. Furthermore, the artificial intelligent systems can be applied widely in agricultural areas, so the results were favorable to the continuity of studies on precision irrigation and application of the fuzzy logic in precision agriculture.

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“…Calculated water loss under advectlve conditions can be 1.6 times the net radiation [Skidmore et al, 1969]. The relative importance of reradiation, convection, and transpiration revealed that reradiation was the dominant mode of heat transfer from plants, that for occasional individual leaves convection can be greater, and that for the crop as a whole transpiration was by far the most important [Idso and Baker, 1967].…”

Section: Fraction Of Net Radiation Used In Evapotranspirationmentioning

confidence: 99%

Evaporation and transpiration

Ekern

1971

EoS Transactions

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A more complete understanding of the evaporative processes and a fund of experimental data have spurred the development of numerical modeling of the energy transfer processes in the lower atmosphere. Numerical simulation for weather forecasts and the prediction of the temperature and moisture fields require accurate prediction of each of the constituents of the energy budget. Models, though still primitive, suggest the relative importance of the input components to demonstrate the major role of the evaporation field in the development of the urban heat island [Myrup, 1969] and to emphasize the major role of positive advection in the evapotranspiration in arid and semi arid zones [Luther, 1970].

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Relative Importance of Reradiation, Convection, and Transpiration in Heat Transfer from Plants

Cited by 23 publications

References 7 publications

Theory and Development of a VRI Decision Support System: The USDA-ARS ISSCADA Approach

Theory and Development of a VRI Decision Support System: The USDA-ARS ISSCADA Approach

Integrating Remote Sensing Data into Fuzzy Control System for Variable Rate Irrigation Estimates

Evaporation and transpiration

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