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plant demand under negative soil solution N/P concentrations
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Description
When soil solution N/P concentrations for a particular layer are negative but tiny values (e.g., -1e-10), plant nutrient uptake profile becomes negative, plant demand becomes negative, and plant loss nutrient into soil.
See [components/clm/src/biogeochem/CNAllocationMod.F90#L3637](https://github.com/ACME-Climate/ACME/blob/master/components/clm/src/biogeochem/CNAllocationMod.F90#L3637)
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