Change the planting date in APSIM7.9

[Chuanwei-zhang-ucas]

Good day everyone, I am trying to change the start of planting date for maize to the first day of five-days mean temperature over 5 ℃, how do it in APSIM, any advice would be appreciate.

[peter-devoil]

Apsim's manager1 was a bit tedious to use for "array" style calculations.

Some manager2 code like below should do what you describe.

using System;
using ModelFramework;
using CSGeneral;

public class Script 
{      
   private ManagerUtility.Tracker<double> meanTTracker; 

   //initialise tracker, telling it how many days to track
   [EventHandler] public void OnInitialised()
   {
      meanTTracker = new ManagerUtility.Tracker<double>(5); 
   }
   // Calculate mean temperature
   [EventHandler] public void OnNewMet(NewMetType nm)
   {
      meanTTracker.Add(( nm.maxt + nm.mint ) / 2);
   }
   [Output, Description("Mean temperature for last 5 days")] public double meant_5  {
      get {
         return(meanTTracker.Average());
      }
      set {}
   }
}

This provides the variable "meant_5" that you can use in your sowing logic

[Chuanwei-zhang-ucas]

Thanks for your help, and how to use the "meant_5" to set the planting date in every year, can you please take me an example ? Sorry for my inexperience in APSIM.

2021-11-01 12:43:12"Peter de Voil" @.***>写道：

Apsim's manager1 was a bit tedious to use for "array" style calculations.

Some manager2 code like below should do what you describe.

using System; using ModelFramework; using CSGeneral;

public class Script {
private ManagerUtility.Tracker meanTTracker;

//initialise tracker, telling it how many days to track [EventHandler] public void OnInitialised() { meanTTracker = new ManagerUtility.Tracker(5); } // Calculate mean temperature [EventHandler] public void OnNewMet(NewMetType nm) { meanTTracker.Add(( nm.maxt + nm.mint ) / 2); } [Output, Description("Mean temperature for last 5 days")] public double meant_5 { get { return(meanTTracker.Average()); } set {} } }

This provides the variable "meant_5" that you can use in your sowing logic

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[peter-devoil]

Sorry, here's some background: Apsim uses (perhaps several) manager modules to sow, (and harvest, fertilise etc) crops during a simulation. Each module is simply a script, written in a programming language that can interact with the simulation. Here's a partially complete introduction to the various languages.

Once you've implemented a script like the above, you can modify your sowing rule to include the variable it exports it in its criteria for sowing. For example, start with the "Sow using a variable rule" rule in the manager toolbox which contains:

      if (paddock_is_fallow() = 1 and FallowIn <> 'yes' and (NextCrop = 0 or NextCrop = '[crop]')) then
         if (date_within('[date1], [date2]') = 1) then
            if (rain[[rainnumdays]] >= [raincrit] AND esw >= [esw_amount]) OR
                ('[must_sow]' = 'yes' AND today = date('[date2]'))) THEN
               ChooseNextCrop = 'yes'   ! for rotations
               [crop] sow plants =[density], sowing_depth = [depth], cultivar = [cultivar], row_spacing = [row_spacing], crop_class = [class]
            endif
...

And modify line 3 in that logic to include your mean temperature test:

      if (paddock_is_fallow() = 1 and FallowIn <> 'yes' and (NextCrop = 0 or NextCrop = '[crop]')) then
         if (date_within('[date1], [date2]') = 1) then
            if (meant_5 > 5 AND rain[[rainnumdays]] >= [raincrit] AND esw >= [esw_amount]) OR
                ('[must_sow]' = 'yes' AND today = date('[date2]'))) THEN
               ChooseNextCrop = 'yes'   ! for rotations
               [crop] sow plants =[density], sowing_depth = [depth], cultivar = [cultivar], row_spacing = [row_spacing], crop_class = [class]
            endif
...

HTH

[Chuanwei-zhang-ucas]

Thank you. That's an excellent solution.

2021-11-02 06:20:15"Peter de Voil" @.***>写道：

Sorry, here's some background: Apsim uses (perhaps several) manager modules to sow, (and harvest, fertilise etc) crops during a simulation. Each module is simply a script, written in a programming language that can interact with the simulation. Here's a partially complete introduction to the various languages.

Once you've implemented a script like the above, you can modify your sowing rule to include the variable it exports it in its criteria for sowing. For example, start with the "Sow using a variable rule" rule in the manager toolbox which contains:

  if (paddock_is_fallow() = 1 and FallowIn <> 'yes' and (NextCrop = 0 or NextCrop = '[crop]')) then
     if (date_within('[date1], [date2]') = 1) then
        if (rain[[rainnumdays]] >= [raincrit] AND esw >= [esw_amount]) OR
            ('[must_sow]' = 'yes' AND today = date('[date2]'))) THEN
           ChooseNextCrop = 'yes'   ! for rotations
           [crop] sow plants =[density], sowing_depth = [depth], cultivar = [cultivar], row_spacing = [row_spacing], crop_class = [class]
        endif

...

And modify line 3 in that logic to include your mean temperature test:

  if (paddock_is_fallow() = 1 and FallowIn <> 'yes' and (NextCrop = 0 or NextCrop = '[crop]')) then
     if (date_within('[date1], [date2]') = 1) then
        if (meant_5 > 5 AND rain[[rainnumdays]] >= [raincrit] AND esw >= [esw_amount]) OR
            ('[must_sow]' = 'yes' AND today = date('[date2]'))) THEN
           ChooseNextCrop = 'yes'   ! for rotations
           [crop] sow plants =[density], sowing_depth = [depth], cultivar = [cultivar], row_spacing = [row_spacing], crop_class = [class]
        endif

...

HTH

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