LUE_YIELD: Light Use Efficiency Model to Estimate Crop Yield

In lue: Light Use Efficiency Model to Estimate Biomass and YIELD with and Without Vapour Pressure Deficit

Description

Contains LUE_YIELD() to estimate aboveground biomass firstly by calculating the Absorbed Photosynthetically Active Radiation (APAR) and secondly the actual values of light use efficiency Shi et al.(2007) <doi:10.2134/agronj2006.0260>.

Usage

LUE_YIELD(fpar_raster,par,tmin,tmin_min,tmin_max,LUE_optimal)

Arguments

fpar_raster	fraction of photosynthetically active radiation (fpar) per day raster with .tif format
par	clear sky surface photosynthetically active radiation (par) per day raster with .nc file format.
tmin	Minimum temperature at 2 metres since previous post-processing per day raster with .nc file format.
tmin_min	minimum value of tmin used for the threshold
tmin_max	maximum value of tmin used for the threshold
LUE_optimal	optical lue value with respect to crop type for example wheat crop LUE_optimal is 3.0 (Djumaniyazova et al., 2010)

Format

A Biomass raster

Value

Yield raster

References

Djumaniyazova Y, Sommer R, Ibragimov N, Ruzimov J, Lamers J & Vlek P (2010) Simulating water use and N response of winter wheat in the irrigated floodplains of Northwest Uzbekistan. Field Crops Research 116, 239-251.

Shi Z, Ruecker G R,Mueller M, Conrad C, Ibragimov N, Lamers J P A, Martius C, Strunz G, Dech S & Vlek P L G (2007) Modeling of Cotton Yields in the Amu Darya River Floodplains of Uzbekistan Integrating Multitemporal Remote Sensing and Minimum Field Data. Agronomy Journal 99, 1317-1326.

Examples

## Not run: 
## load the data
data(fpar)
data(par1)
data(tmin)
LUE_YIELD(fpar,par1,tmin,-2,12,3)

## End(Not run)
library(raster)
fparr <- raster(nc=2, nr=2)
values(fparr)<-runif(ncell(fparr),min =0.2,max= 0.8)
par11<- brick(nc=2, nr=2, nl=2)
values(par11)<-runif(ncell(par11),min =169076.9,max= 924474.6)
tminn <- brick(nc=2, nr=2, nl=2)
values(tminn)<-runif(ncell(tminn),min = 278,max= 281)
LUE_YIELD(fparr,par11,tminn,-2,12,3)

lue documentation built on May 2, 2019, 2:11 a.m.