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ApsimX is the next generation of APSIM
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Canopy development based on leaf length and leaf width #5162

Open peter-devoil opened 4 years ago

peter-devoil commented 4 years ago

It is proposed to develop a generic model for canopy leaf area development of C4 cereals that uses response of length and width of individual leaves to leaf position and development stage

Erik Van Oosterom is seeking opportunities for funding and devlopment

sarahcleary commented 4 years ago

@erik-van-oosterom

erik-van-oosterom commented 4 years ago

By linking length and width of leaves to development stages, the size and position of the largest leaf would become an emergent property of the model, rather than an input (function of total leaf number) as is currently the case. The framework would also capture the differences in leaf area profiles between maize and sorghum/millet and the leaf area profiles of photoperiod sensitive sorghum with >25 leaves (which cannot be captured by current approaches). There are lots of data available to develop the concept, juts need to find the time (student) to get this done

EnliWang commented 3 years ago

How is this moving forward? We have had some issues in simulating maize leaf area, and have also leaf size data to contribute to this.

I think there is value to look at the leaf size approaches for both C3 and C4 cereals.

Richkul commented 3 years ago

Model development in APSIM to Simulate C3 and C4 Cereals for Agrivoltaics

erik-van-oosterom commented 3 years ago

I haven't done much on this recently, but I have a lot of data on sorghum, maize, millet. I have a general concept of how to develop something that is generic across these 3 species that would capture the following

  1. seemingly different profiles of maize vs sorghum and millet
  2. leaf area profile of crops with high leaf numbers (where current bell-shaped curves don't work)
  3. main shoot vs tillers.
  4. links directly to phenology some of this is already sort-of implemented in sorghum. Just needs somebody to have the time to actually analyses the data in more detail in more detail. concepts should work fro C3 also, although not sure how vernalisation has an effect on leaf size.
uqschap7 commented 3 years ago

@erik-van-oosterom A major publication in maize on this was from Karine https://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2007.01772.x

I also have a LOT of individual leaf size data for maize collected in Mexico years ago at 4 altitudes and 2 seasons of climate - creating very diverse profiles. Could include sugarcane in this as well? It models leaf area by adding leaves up to a maximum length and size when they keep adding...

erik-van-oosterom commented 3 years ago

Scott,

Yes, I am aware of that paper and that would be handy in the development of this approach. And many of the maize data I have are indeed yours from Mexico. They're good quality, but if they would also have had ear leaf position they would have been amazing....helps to make the link to sorghum/millet Extension to sugar cane should be straightforward as that seems quite similar to West African sorghum. Can probably be implemented through link to phenology and stem elongation.

From: uqschap7 @.> Sent: Friday, 22 October 2021 4:48 PM To: APSIMInitiative/ApsimX @.> Cc: Erik Van Oosterom @.>; Mention @.> Subject: Re: [APSIMInitiative/ApsimX] Canopy development based on leaf length and leaf width (#5162)

@erik-van-oosteromhttps://github.com/erik-van-oosterom A major publication in maize on this was from Karine https://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2007.01772.x

I also have a LOT of individual leaf size data for maize collected in Mexico years ago at 4 altitudes and 2 seasons of climate - creating very diverse profiles. Could include sugarcane in this as well? It models leaf area by adding leaves up to a maximum length and size when they keep adding...

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sarchontoulis commented 3 years ago

@erik-van-oosterom keep us updated on this. We can contribute maize data from the US. Ear leaf position included.