Site name	IARI Flux Site
AsiaFlux site code	IFS
Location	Delhi, India
Position	28°38'37.7"N , 77°09'09.8"E
Elevation	207 MSL
Slope	0
Terrain type	Flat
Area	3ha
Fetch	150-200m
Climate	Dry Climate (Semi arid - low latitude - monsoon (BSh))
Mean annual air temperature	24.1 °C (1971-2000)
Mean annual precipitation	779mm (1971-2000)
Vegetation type	Cropland
Domestic species (Overstory)	Rice (Oryza Sativa), Spring Wheat (Triticum asetivum)
Dominant species (Understory)	Nil
Canopy height	1 m
Age	Rice (100-130 days); Wheat (100-140 days)
LAI	Maximum 5.0 (Rice), 5.5 (Wheat)
Soil type	Silty Clay Loam

Observations
Eddy Covariance method (CO₂)

System	Closed-path system (CO2 flux, latent heat flux)
Wind speed	Three-dimensional sonic anemometer CSAT-3 (Campbell Scientific, USA)
Air temperature	Three-dimensional sonic anemometer CSAT-3 (Campbell Scientific, Canada)
Water vapor	LI-7200, LI-COR, USA
CO2	LI-7200, LI-COR, USA
Measurement height	2.05 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	CR3000 (Campbell,USA)
Data storage	Compact flash card
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	2.44m above the surface	Radiometer (CNR-4 Kipp & Zonan The Netherlands)
Global solar  radiation (outgoing)	2.44m above the surface	Radiometer (CNR-4 Kipp & Zonan The Netherlands)
Long-wave radiation(outgoing)	2.44m above the surface	Radiometer (CNR-4 Kipp & Zonan The Netherlands)
Long-wave radiation(outgoing)	2.44m above the surface	Radiometer (CNR-4 Kipp & Zonan The Netherlands)
Net radiation	2.44m above the surface	Net Radiometer (NR-Lite2 Kipp & Zonan The Netherlands)
PPFD (incoming)	2.44m above the surface	Silicon Qunatum Sensor (Kipp & Zonan The Netherlands)
PPFD (outgoing)	-
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	2.0m above the surface	HC-2S3 (Pt100 RTD based, Rotronic Switzerland)
Humidity	2.0m above the surface	(HygroClip S3 based, Rotronic Switzerland)
Soil temperature	5, 15, 30, 60 cm depth from surface	Platinum resistance thermometer
Soil heat flux	5, 15, 30, 60 cm depth from surface	Heat flux plate (HFP03 Hukseflux The Netherlands )
Soil water   content	5, 15, 30, 60 cm depth from surface	TDR sensor (CS616 Campbell Scientific Canada)
Wind speed	2.05 m above surface	(CSAT-3 Campbell Scientific USA)
Wind direction	2.05 m above surface	(CSAT-3 Campbell Scientific USA)
Barometric   pressure	0.5m above surface	LI 7500
Precipitation	0.90m	Tipping-bucket rain guage (Texas electronics Inc. USA)
CO2 concentration	2.05 m above surface	Closed-path CO2/H2O analyzer (LI-7200 LI-COR)

Fluxes of non-CO₂ gases

Gas	CH4, N2O H2O
Method	CH4 (LI-7700; Chamber), N2O (Chamber), H2O (LI-7200)
Measurement height	CH4 (2.05m, 0), N2O (0), H2O (2.05m)
Data logger	Campbell CR3000, USA
Data storage	Flash memory

Soil respiration

Measurement method	Closed Chamber Method
Reference(s) for method (if have)
Measuring system	LI-8100 (Li-Cor Lincoln, NE)
IRGA	Yes
Flow control	Upto 3.0 lpm
Chamber type	PVC chamber
Chamber size	15.2×15.2×25.4 cm
Number of chambers	1
Measuring intervals	Non-continuous; Weekly/biweekly measurements
Is the ground covered by snow in winter? (if yes, how about the measurement in winter?)	No
Original data (Raw data or statistics)	Raw data
Temperature and air pressure correction (if done, which temperature was used?)

Other

Photosynthesis	Occasionally
Ecological investigation	Occasionally Biomass, LAI, Plant Height, Economic Yield, Some physiological parameter