measurement and estimation of different environmental variables
Post on 18-Oct-2014
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Measurement and estimation of different environmental variablesTRANSCRIPT
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Measurement and estimation of different environmental variables
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Measurement of air temperature
Thermometer placed in Stevenson screen
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Thermocouples connected with data logger
Measurement of air temperature
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Measurement of rainfall
Rain gauge
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Measurement of wind speed and wind direction
Rotating cup anemometer
Kestrel 2500 hand-held weather meter
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Sonic anemometer (for horizontal and vertical wind speed)
Measurement of wind speed
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Measurement of relative humidity
Hygrometer
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Measurement of light intensity (lux)
Lux meter
Light meter
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Potential evapotranspirationA measure of the ability of the atmosphere to
remove water from the surface through the processes of evaporation and transpiration assuming no control on water supply.
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Potential evapotranspiration
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Potential evapotranspiration
Penman–Monteith equation (after Howard Penman and John Monteith) Predicts net evapotranspiration (ET), requiring as input daily mean temperature, wind speed, relative humidity and solar radiation
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Drought index
A number representing net effect of evaporation, transpiration, and precipitation in producing cumulative moisture depletion in deep duff or upper soil layers.
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Measurement of solar radiation
Pyranometer
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Pyranometer
Measurement of solar radiation
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Measurement of solar radiation
Campbell-Stoke Sunshine recorder
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PAR measurement over crop canopy (µmol photons m-2s-1)
Accupar
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Questions?