Hi, Dear Jordan,

Even as your request dates from july, I don't see a respond to it through
the list.

DSSAT 3 and 4 are capable of running one crop after the other, named crop
rotation. The tool used to do it is the sequence analysis tool of the DSSAT.
To account for multiple plant population, planting dates, and row spacing
you will need to set a different treatment for each combination used.

- To create a sequence experiment file Ask for the menu sequence "Model |
Sequence" on the menu bar or use the tree - like structure in the middle
section to navigate to the "Analysis \ Sequence" branch.

- Call the XBuild tool by pressing the "Crop Management Data" in the left
section the same way you create a standard experiment file.

- Create a new experiment file and ask for "sequential" as the "File type"
in the top drop down list. Fill in the remainder fields as usual. Then press
the 'Next' button.

- Add your cultivars (one or more for each crop type: soybean and wheat).
Press "Next".

- State your field data as usual (probably only one, if you consider the
same field). Then press "Next".

- State your planting details. Create as many levels you need to accommodate
each combination (plant population, planting dates, row spacing, etc) for
each cultivar. Press "Next".

NOTE: Regardless of how many planting details, cultivars and fields you
create, the XBuild Wizard only creates one treatment set with the very first
level of each section.

- Select the "treatments" menu and set a treatment for each combination of
details for each cultivar. Set the rotation number to 1 for the first
cultivar and set 2 for the second one.

NOTE: I do not guaranty you that it will work with more than a treatment for
each rotation component, specially if the second one is going to start with
the simulated conditions at the end of the previous component.

A couple of things are still pending. You should specify different
simulation options for both cultivars, starting the simulation on the same
date. You should create the initial conditions for the first rotation crop
and specify no one for the second. Optionally, you may specify in the
"methods" subsection of the "simulation options" for the second rotation
crop that you want to use the "initial conditions" resulting from the
previous simulation.

Pls, study in detail the sequence files (*.SQX) coming with DSSAT4 to better
understand how to set an experiment file like this.

Best regards,

RR



----- Original Message -----
From: "Jordan Shockley" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, July 30, 2008 4:50 PM
Subject: Double-cropping


> Dear ALL,
>
>   I was wondering if DSSAT 4 could double-crop (soybeans then winter wheat
> in same year).  If DSSAT can do this, could someone let me know how.
> Ideally, I need to run 30 years of double-crop soybeans and wheat in the
> same year over multiple plant population, planting dates, and row spacing.
> --
> Jordan Shockley
> University of Kentucky
> Department of Agricultural Economics
> 331 C.E. Barnhart Building
> Lexington, KY 40546-0276
> Email: [log in to unmask]
>
>
> --
> Jordan Shockley
> University of Kentucky
> Department of Agricultural Economics
> 331 C.E. Barnhart Building
> Lexington, KY 40546-0276
> Email: [log in to unmask]
>
>