Simulation of Maize, Growth, LAI, Photosynthesis and phenology

Usage

MaizeGro(WetDat, plant.day = NULL, emerge.day = NULL, harvest.day = NULL, plant.density = 7, timestep = 1, lat = 40, canopyControl = list(), MaizeSeneControl = list(), photoControl = list(), MaizePhenoControl = list(), MaizeCAllocControl = list(), laiControl = list(), soilControl = list(), MaizeNitroControl = list(), centuryControl = list())

Arguments

WetDat

weather data as produced by the weach function.

plant.day

Planting date (format 0-365)

emerge.day

Emergence date (format 0-365)

harvest.day

Harvest date (format 0-365)

plant.density

Planting density (plants per meter squared, default = 7)

timestep

Simulation timestep, the default of 1 requires houlry weather data. A value of 3 would require weather data every 3 hours. This number should be a divisor of 24.

lat

latitude, default 40.

canopyControl

List that controls aspects of the canopy simulation. It should be supplied through the canopyParms function. Sp (specific leaf area) here the units are ha Mg^{-1}. If you have data in m^2 of leaf per kg of dry matter (e.g. 15) then divide by 10 before inputting this coefficient. SpD decrease of specific leaf area. Empirical parameter. Default 0. example value (1.7e-3). nlayers (number of layers of the canopy) Maximum 50. To increase the number of layers (more than 50) the C source code needs to be changed slightly. kd (extinction coefficient for diffuse light) between 0 and 1. mResp (maintenance respiration) a vector of length 2 with the first component for leaf and stem and the second component for rhizome and root.

MaizeSeneControl

List that controls aspects of senescence simulation. It should be supplied through the MaizeSeneParms function. senLeaf Thermal time at which leaf senescence will start. senStem Thermal time at which stem senescence will start. senRoot Thermal time at which root senescence will start.

photoControl

List that controls aspects of photosynthesis simulation. It should be supplied through the MaizePhotoParms function. vmax Vmax passed to the c4photo function. alpha alpha parameter passed to the c4photo function. kparm kparm parameter passed to the c4photo function. theta theta parameter passed to the c4photo function. beta beta parameter passed to the c4photo function. Rd Rd parameter passed to the c4photo function. UPPERTEMP UPPERTEMP parameter passed to the c4photo function. LOWERTEMP LOWERTEMP parameter passed to the c4photo function. Catm Catm parameter passed to the c4photo function. b0 b0 parameter passed to the c4photo function. b1 b1 parameter passed to the c4photo function.

MaizePhenoControl

argument used to pass parameters related to phenology characteristics MaizePhenoControl here~~

soilControl

here~~

nitroControl

here~~

centuryControl

here~~

Examples

data(weather05)
res <- MaizeGro(weather05, plant.day = 110, emerge.day = 120, harvest.day=300,
                  MaizePhenoControl = MaizePhenoParms(R6 = 2000))

See also

Author