measurement and estimation of different environmental variables
Post on 18-Oct-2014
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Measurement and estimation of different environmental variablesTRANSCRIPT
Measurement and estimation of different environmental variables
Measurement of air temperature
Thermometer placed in Stevenson screen
Thermocouples connected with data logger
Measurement of air temperature
Measurement of rainfall
Rain gauge
Measurement of wind speed and wind direction
Rotating cup anemometer
Kestrel 2500 hand-held weather meter
Sonic anemometer (for horizontal and vertical wind speed)
Measurement of wind speed
Measurement of relative humidity
Hygrometer
Measurement of light intensity (lux)
Lux meter
Light meter
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.
Potential evapotranspiration
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
Drought index
A number representing net effect of evaporation, transpiration, and precipitation in producing cumulative moisture depletion in deep duff or upper soil layers.
Measurement of solar radiation
Pyranometer
Pyranometer
Measurement of solar radiation
Measurement of solar radiation
Campbell-Stoke Sunshine recorder
PAR measurement over crop canopy (µmol photons m-2s-1)
Accupar
Questions?