New Sorghum model in PMF

[aldoherty]

No description provided.

[jbrider]

There are several parameters that affect senescence. senRadnCrit is dealing with senescence caused by low light conditions - I can check that to be sure. Sorghum doesn't have age senescence if that's what you're trying to adjust.

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On Thu, Feb 11, 2021 at 3:26 PM Jonathan Ojeda ***@***.***> wrote: @jbrider <https://github.com/jbrider> Is there some update in terms of the model parameters that control senescence? I have a couple of genotypes and would like to differentiate them based on thermal time measurements and senesce rate. Initially, we had a discussion about the meaning of senRadnCrit parameter. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#572 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAE3G7FYCMYGFG2CTNXJQTTS6NTAHANCNFSM4BWGKYTQ> .

[JJguri]

I have a couple of genotypes and cover green data until maturity. I would like to Parameterise not only the thermal time during vegetative periods but also the response curve of cover green after flowering and the reduction because dead leaves. I have also green and dead leaves measurements. Could you please list the parameters involved in the senescence process? Thanks Regards, Jony On 12 Feb 2021, at 7:18 am, Jason <[email protected]<mailto:[email protected]>> wrote: There are several parameters that affect senescence. senRadnCrit is dealing with senescence caused by low light conditions - I can check that to be sure. Sorghum doesn't have age senescence if that's what you're trying to adjust.

On Thu, Feb 11, 2021 at 3:26 PM Jonathan Ojeda ***@***.******@***.***>> wrote: @jbrider <https://github.com/jbrider> Is there some update in terms of the model parameters that control senescence? I have a couple of genotypes and would like to differentiate them based on thermal time measurements and senesce rate. Initially, we had a discussion about the meaning of senRadnCrit parameter. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#572 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAE3G7FYCMYGFG2CTNXJQTTS6NTAHANCNFSM4BWGKYTQ> .

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#572 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AJZD6KMH3LLPIYAA7SXZIA3S6RCSVANCNFSM4BWGKYTQ>.

[jbrider]

@JJguri Are you working in NextGen or in Classic?
It's probably better to create a new issue when you have a new question in the appropriate version's github page.
Do you have good leaf number data - which you can use to get the phenology correct first?
If your phenology is wrong, then so will your number of leaves and you won't be able to get Cover correct.

[JJguri]

@JJguri Are you working in NextGen or in Classic?
It's probably better to create a new issue when you have a new question in the appropriate version's github page.
Do you have good leaf number data - which you can use to get the phenology correct first?
If your phenology is wrong, then so will your number of leaves and you won't be able to get Cover correct.

Particularly for this, I am working with NG. I can see that the modelled cover green persist and senescence is not affecting at all after flowering. I will create a new issue related to this and I will have a look if the same pattern exists in Classic. I have leaf number measurements to parametrise the model. Thanks

[tkd708]

Hi there,

Would this new Sorghum module in APSIM Next Gen be available anytime soon?

Also, either in APSIM Classic or Next Gen, I wonder which parameters other than phenology should be checked with higher priority to simulate the response of crop growth to N rates.
There are quite a few N-related crop parameters (at least in Classic) but apparently non of the pre-set cultivars have modified them... it would also be very helpful if you could refer to any documented cases modifying these parameters.

Best,
Naoya

[jbrider]

@tkd708 I'm currently trying to shuffle around projects to get back to finishing off sorghum, so hoping it won't be too much longer.

Can you explain a bit more about what you're looking for regarding N responses.

[tkd708]

@jbrider
Great, I'm looking forward to updates on Sorghum in Next Gen!

Regarding N responses, we are trying to simulate soil N cycles for N rate trials in sorghum.
We have got grain yield, biomass and N uptake observed at harvest but no in-season biomass or LAI data.
Therefore, we would like to calibrate a minimum number of parameters and rather focus mainly on SoilN parameters to change.

Then, which parameters should be checked with higher priority to simulate the response of crop growth to N rates (and their reasonable ranges)?
Also, are there any documented cases modifying N-related crop parameters in Sorghum?

Any recommendation from your experience would be much appreciated!

Best,
Naoya

[jbrider]

@tkd708 I would start with the paper below that describes the N response that is used in sorghum. The leaf model has been updated since in APSIM but follows the same N dynamics.

Adapting APSIM to model the physiology and genetics of complex adaptive traits in field crops
Graeme L. Hammer, Erik van Oosterom, Greg McLean, Scott C. Chapman, Ian Broad, Peter Harland, Russell C. Muchow

[tkd708]

@jbrider
Thank you for sharing the reference! I'll go through it and try simulations.

Best,
Naoya