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femiguez / apsimx

R package for APSIM-X
https://femiguez.github.io/apsimx-docs/
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Modeling the Impact of Water and Nitrogen Stress on Maize Phenology Using APSIMX #118

Closed lyfranki closed 6 months ago

lyfranki commented 1 year ago

Hello Dr. Fernando Ezequiel Miguez,

  1. I'm currently simulating maize phenology using APSIMX and I'm unsure if the Maize.Leaf.Fw variable represents water stress. Could you please confirm if this is the case?
  2. While analyzing my simulation results, I observed that Maize.Leaf.Fw values were sometimes below 1. However, it did not appear to affect thermal time accumulation or the duration between corresponding phenology stages. Can you provide any insights on why this might be the case? Maybe I did something wrong.
  3. I'm interested in understanding how APSIMX considers water stress and nitrogen levels when simulating maize phenology. While APSIM accounts for these factors as shown following, I have not been able to locate the relevant code in APSIMX. Could you please confirm if APSIMX incorporates these factors in a similar manner, and if so, provide any guidance on where I can find this information? Generally, the APSIMX inherit all the module in the APSIM Classif, right?

image (https://github.com/APSIMInitiative/APSIMClassic/blob/27396788a2c0fcc2750b72700d7fccf35fc7c7ea/Model/Maize/Phenology.cpp#:~:text=double%20Phenology%3A%3AcalcStressesTT(void))

Thanks! Yin

femiguez commented 1 year ago

@lyfranki The issues you are pointing out are known in APSIM. We recently open an issue in github about Nitrogen stress

https://github.com/APSIMInitiative/ApsimX/issues/7839

I see that you posted this here:

https://github.com/APSIMInitiative/ApsimX/issues/7881

I'm hoping you have better luck there, because there is not much I can do about addressing this issue

lyfranki commented 1 year ago

@lyfranki The issues you are pointing out are known in APSIM. We recently open an issue in github about Nitrogen stress

APSIMInitiative/ApsimX#7839

I see that you posted this here:

APSIMInitiative/ApsimX#7881

I'm hoping you have better luck there, because there is not much I can do about addressing this issue

Thanks for your reply!

lyfranki commented 1 year ago

@femiguez One more question, could we get actual evapotranspiration (ET), potential ET (PET), sw_supply (Daily soil water supply over the profile), and sw_demand (Total crop demand for water) when simulating using ApsimX?

femiguez commented 1 year ago

You need to look for those in the Report. For example, PET is in [MicroClimate].PetTotal (However, the docs has units of MJ/m2, but this might be wrong and it's actually mm). They are not super easy to find but the soil related variables will be in [Soil].SoilWater.ESW (for extractable soil water)

femiguez commented 6 months ago

I'll close this for now. Open a new one if needed