- #Apsim batch mode full
- #Apsim batch mode simulator
This makes the total N applied equal to the fertilised treatment) This has been chosen so as to apply 25 kgN/ha at each application. (Note: By default, SurfaceOM type = manure is 8%C in the standard apsim release.
For Manure at sowing, set ‘event from’ to maize, amount = 2500 kg/ha, type = manure, CNR = 8 and CPR = 50. For Manure on fixed date, set date to 1-Sep, amount = 2500 kg/ha, type = manure, CNR = 8 and CPR = 50. Remove Fertilise at sowing from Manager. Drag Tillage on a fixed date onto Manager. Drag Manure on fixed date AND Manure at sowing onto Manager (These templates are found in “Standard toolbox” -> Management-> “African and Indian specialisations” -> “Phosphorus and Manure” ). Rename this copy to Maize_50Nmanure_SR2010. Make a copy of the simulation Maize_50N_SR2010 by dragging to the Simulations node at the top of the simulation tree. Drag Fertilise at sowing on to the Manager Folder (from “Standard Toolbox” -> Management-> “Manager (common tasks)”. Make a copy of the simulation Maize_0N_SR2010 by dragging it to the Simulations node at the top of the simulation tree. In this exercise we will simulate the growth and yield response of maize to nitrogen inputs as fertiliser and manure for a single season (2010SR). What explains the higher water use by the cowpea relative to the maize? Response of maize to organic and inorganic N inputs However, the cowpea crop uses more esw in Nov and Dec compared to the maize and this is consistent with its higher biomass production. Higher initial levels of soil NO3-N are reduced to near zero for both cowpea and maize in the Oct/Nov period. Plot esw and no3_tot on an XY graph (again put XY graph onto the top node Simulations). Let’s examine the effects of the different crop growth patterns on soil resources. The initial growth of cowpea is much less than that of maize, but final biomass and grain yield of cowpea is much higher than the maize. (Drag or Insert the XY graph on the top simulation node to plot output from both simulations) Plot Mz_tbm, Mz_grn, Cp_tbm and Cp_grn with an XY graph with Date on the X axis. Run the Maize and Cowpea simulations for the Short rains 2010 season. Check that the ‘harvest rule’ node indicates that cowpea should be harvested. Leave all the other parameters as they are Change the sowing rule to: set name of crop to cowpea. Drag a Cowpea module onto the simulation paddock (from Standard Toolbox-> Crops) and delete the maize module. Make a copy of the simulation by dragging Maize_0N_SR2010 node to the Simulations node at the top of the simulation tree. Save the simulation file as Crops_single_season.apsim. Rename the simulation to Maize_0N_SR2010. Check that the ‘ harvest rule’ node indicates that maize should be harvested. The maize module interprets the units here as metres, not millimetres, which can be confusing) Drag “Sow on a fixed date” into the Manager component (from Standard Toolbox -> Management -> “Manager (common tasks)”. In the Manager component, delete the Sowing fertiliser (we will not add fertilizer in this simulation) and the Sorghum Sowing rule. In the Surface Organic Matter component, set initial surface residues to none, change surface organic matter type and pool to maize, and set initial surface residue to 0 kg/ha. Drag Maize module onto the simulation paddock (from Standard Toolbox-> Crops) and delete the sorghum module. Set the Starting nitrogen to 20 kg/ha of NO3 (as 12 and 8 in each layer, respectively) and 5 kg/ha (4 + 1) of NH4. #Apsim batch mode full
Set the Starting water to 75% full – filled from top. Select the “Chromic Luvisol, Katumani Research Station (PAWC = 164mm)” (International toobox->Kenya). Start a fresh simulation using Continuous Sorghum as a template. These skills can also be used to “experiment” with time of planting, rate of sowing, crop comparisons and different starting soil moisture conditions. #Apsim batch mode simulator
You will learn a bit more about specifying a Manager template, execute more than one run in batch mode and use the simulator to do a “what-if” experiment with fertiliser rates and type. In this exercise we will simulate the growth and yield of maize and cowpea in the same season with identical starting conditions and compare their growth and water use.
0 kommentar(er)
