Fertilizer Nitrogen Not Applied in Simulation Despite Schedule Settings

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Naoki Ban

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Apr 22, 2025, 10:54:23 PMApr 22

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Dear SWAT+ Editor users,

I am conducting land modeling for a tropical island country and currently running a 10-year simulation using SWAT+ Editor.

However, I encountered an issue regarding nutrient outputs: in the file hru_nb_aa.txt, the values for fertn, fixn, no3atmo, and nh4atmo are all zero, while nutrient uptake by plants is occurring as expected.

I configured the management schedule using the Schedule Builder to apply both phosphorus and nitrogen fertilizer. Still, nitrogen does not appear to be applied. I have tried adjusting the heat units for plant growth and increasing the frequency of fertilization, but the results did not change.

According to the documentation, I understand that legume crops do not receive nitrogen fertilizer, but the plant community I used is frst_sums, which should not fall into that category.

I have attached a screenshot from the SWAT+ Editor check screen. I would greatly appreciate any advice or insights on why nitrogen fertilizer is not being applied in this case.

Best regards,
Naoki

SWAT+check_lantgrowth.png

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