Apsim Google Group

Re: 2-season maize simulation

2009-12-11T15:11:46Z

Dear Dean,

Yes, l analysed soil water and %N of the study areas for this research, and
would be very grateful if you could provide the processes involved in
setting the water and nitrogen content for the simulation period.

regards
Emmanuel

crop failure because of total leaf senescence.

2009-12-11T02:04:51Z

I am working with the lupin module, trying to test some hypothesis
about phenology and water stress.
I am trying to change the thermal time from flowering to start of
grain filling and from start to grain filling to the end of grain
filling (these are some of the cultivar parameters at the end of the

Re: 2-season maize simulation

2009-12-10T01:41:19Z

Hi Emmanuel

Can't see any obvious problem other than you're not resetting water or
N for the entire 30 years of simulation. If after year 1 the water and
N simulated values are slightly out, then after year 2 they will be a
little more out and so on until 30 years later where the water and N
bear no resemblance to actual water and N.

Re: about apsim maize model

2009-12-10T00:59:51Z

Hi niya,
This could be a regionalisation issue. Could you take a screenshot
(alt-prtscn) of the UI, paste that into a word document and mail it to
me, please? Could you also include the .apsim file you're working
with.
Yours,
pdev

Re: grazing wheat does not die or get harvested in some years

2009-12-10T00:55:28Z

Hi jan,

The delay is caused by the effect of grazing slowing down phenological
development of the wheat crop. There is dissention here as to how
severe that effect should be, with some feeling that we should remove
it completely. But that will take a while. Here's a few things we can
try in the interim.

Re: 2-season maize simulation

2009-12-09T16:38:24Z

Dear Dean,

The summary file is attached for your information and further action
thanks
Emmanuel

about apsim maize model

2009-12-08T08:47:48Z

dear, someone
now,I use apsim 7.0 for maize model. I have some problems about manager box in maize simulation. my problem are manager box in my standard box in simulation is lost or i can see it on page same place that i see in Introduction of apsim documetation. I don't understand why it dose. I want to somebody can help me about that. please to tell me how to do about manager box or tell me about step to use it. And I want to talk with someone use apaim maize same me for consult about apsim-maize.

grazing wheat does not die or get harvested in some years

2009-12-08T05:36:06Z

i am growing wedgetail as a grazing wheat, removing biomass in july.
all fine, except in some years it fails to harvest.
can you help?

if graz_wheat.StageName = 'harvest_ripe' or graz_wheat.plant_status =
'dead' or graz_wheat.daysaftersowing = 240 then

!******* do GM calcs for wheat *******

RE: Variable report

2009-12-07T23:05:26Z

Thanks, Dean. This order makes sense.
Cheers,
Frank

-----Original Message-----
Sent: Tuesday, 8 December 2009 11:53 a.m.
To: Apsim

Hi Frank

The order that modules are called in APSIM each day is:

clock
report
met
manager

The "start_of_day" event is sent to these modules in the order

Re: Trouble shooting guides

2009-12-07T23:04:43Z

Yeah good question John

They seem to have gone missing. We'll still have it in version control
somewhere. When I get time, I'll go looking.

Dean

Re: Rocks/stones in soil

2009-12-07T23:03:26Z

The Rocks column isn't used anywhere in APSIM.

I guess you should enter stone-corrected water contents. Disclaimer:
This advice comes from a software engineer who's only exposure to
soils comes from digging a vegetable garden once in a while.

Dean

Re: PAW

2009-12-07T23:00:32Z

Ross

If you're outputting "esw" then it is relative to LL15 (15 bar lower
limit): SW - LL15. This number can be compared directly to DUL-LL15
(PAWC)

If you're outputting "esw_layer" from maize then it will be relative
to maize lower limit: SW - LL. You can't compare this number easily to
DUL-LL15 which is your PAWC.

Re: Variable report

2009-12-07T22:52:37Z

Hi Frank

The order that modules are called in APSIM each day is:

clock
report
met
manager

The "start_of_day" event is sent to these modules in the order
specified, then a "process" is sent to all modules, then a
"end_of_day" is sent to all modules in the other specified. So report
gets it's "end_of_day" ("daily") event before the manager does which

Re: 2-season maize simulation

2009-12-07T22:37:12Z

Hi Emmanuel

I'll need to see the summary file. The file you attached is the
simulation which looks ok to me.

When simulations don't match what you expect, it is often due to the
amount of water and/or nitrogen not matching reality. Have you checked
to make sure that the water / N matches what you expect?

RE: Variable report

2009-12-07T00:59:19Z

Hi Dean
I re-examined the specification of the 'Report frequency' I did before for with wheat example *.apsim attached.
The phenomena is that
With 'Fertiliser application at a fixed date (5-Jul)' specified on 'end_of_day' tab,
1) if 'report frequency' is specified as 'daily', the fertiliser amount did not show up as an output variable (name: fertiliser), but it can be tracked on the following day (6-Jul) in the tracker (name: total_fert);