No (=0) crop yield values after change from auto management schedule to manual schedule

[Jonas]

Hello everyone,

 

I'm working on a hydrological model of the Mula-Mutha catchment area in the western Ghats in India for a hydrology course. Over the past semester I learned the basics of QSWAT+ and how modelling works generally but the software is still kind of new to me.

However, for the final assignment I have to change model parameters with the objective to for example mitigate climate change consequences and analyze the outcomes.

 

I chose to take a look at the irrigation management of the areas used for agriculture. The auto management schedules in the SWAT+ editor were deleted and individual crop rotation schedules were added manually to adjust them to conditions of the investigated area.

 

So, my first idea was to take a look at the impact of changes in irrigation management on the crop yield.

Attempting this, I realized that the values in the crop yield output files (i.e., "crop_yld_aa") are always 0.

However, when I run the simulation using the auto management schedules, there are actual values for the crop yield.

 

Ultimately, I would like to know why the output values using the modified schedule are always 0.

 

I'd appreciate any helpful advice.

(QGIS version: 3.22.3; SWAT+ Editor version: 2.0.4)

 

I attached a screenshot of one of the crop species' modified schedule.

 

Many thanks!

[Vitor Malagutti]

Hi Jonas,

I have a very similar problem. Have you figured out what was it?

My crop yield is always 0. And I also have 0 stress days of water, N, or P, which is a bit weird. There is no uptake of nitrogen or phosphorus neither.

Best,

Vitor

[Revanth Mamidala]

Hello,
Yes, I have same issue. Unless we use the default management schedule, pl_hv_summer1(corn) in my case. I applied pl_hv_summer2
_corn_soyb and many other combinations to find out the yield simulated to be zero. 

[fatima ilyas]

  Hi,
I have experienced the same issue. Did you manage to solve the problem mentioned above?  

[Sikandar Ali]

I have develop and calibrated SWAT+ model for the Indus basin. Everything is fine and irrigation is applied for "agi1_lum" landuse as can be seen in screenshot attached. and rotation is "wwht_corn_rot"  I have run the model with and without fertilizer, but yield is zero. Can anyone help me where is the problem?

[Anurag Yadava]

buddy, did u get the way to understand how crop yield is not simulated....if yes please tell me.

Thanks in Advance

[Revanth Mamidala]

Hello,
The problem is due to wrong management schedules. If you give manual management schedule, you primarily need to define planting and harvest of the crop either using dates or heat units.
I will be able to help you more if you can share your management.sch file with me. 

Best Regards
Revanth