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i.biomass - Computes biomass growth, precursor of crop yield calculation.


imagery, biomass, FPAR, yield


i.biomass --help
i.biomass fpar=name lightuse_efficiency=name latitude=name dayofyear=name
transmissivity_singleway=name water_availability=name output=name [--overwrite] [--help]
[--verbose] [--quiet] [--ui]

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

fpar=name [required]
Name of fPAR raster map

lightuse_efficiency=name [required]
Name of light use efficiency raster map (UZB:cotton=1.9)

latitude=name [required]
Name of degree latitude raster map [dd.ddd]

dayofyear=name [required]
Name of Day of Year raster map [1-366]

transmissivity_singleway=name [required]
Name of single-way transmissivity raster map [0.0-1.0]

water_availability=name [required]
Value of water availability raster map [0.0-1.0]

output=name [required]
Name for output daily biomass growth raster map [kg/ha/d]


i.biomass calculates the biomass growth for a day after [1][2]. Input:

· fPAR, the modified Photosynthetic Active Radiation for crops.

· Light Use Efficiency [0.0-1.0], in Uzbekistan cotton is at 1.9 most of the time.

· Latitude [0.0-90.0], from r.latlong.

· DOY [1-366].

· Transmissivity of the Atmosphere single-way [0.0-1.0], mostly around 0.7+ in clear

· Water availability [0.0-1.0], possibly using direct output from i.eb.evapfr.


It can use the output of i.eb.evapfr directly as water availability input.


Remove Latitude, DOY and Tsw from input and replace with a raster input compatible with
r.sun output.

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