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AgroCares / BedrijfsBodemWaterPlanCalculator

Algorithms to support field specific solutions for optimized agronomic land use.
https://agrocares.github.io/BedrijfsBodemWaterPlanCalculator/
GNU General Public License v3.0
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Effect of grassland on N leaching and N run-off #88

Closed yuki-nmi closed 4 months ago

yuki-nmi commented 4 months ago

Problem: Soil total N is one of the sub-indictaors for the risk of N run-off (nsw_nlv) and risk of N leaching (ngw_nlv).

For the risk of N run-off, grassland has a correction term (i.e. if grassland, risk for N run-off is 0.5 point lower): https://github.com/AgroCares/BedrijfsBodemWaterPlanCalculator/blob/6bb696d50aa0248c4a4cb8c79dd1c2f0819f682a/R/bbwp_field_properties.R#L206

On contrast, grassland gets no correction for the risk of N leaching.

It seems more logical to assume that grassland has a positive effect on N leaching because of their intensive root system and therefore higher nutrient retention than arable crops. The effect of grassland on N run-off would be minor because water flows out before it enters the root zone.

Suggestion:

yuki-nmi commented 4 months ago

I discussed with Gerard about this issue.

The correction for grassland was not added for ngw_nlv, beuase the effect of landuse type is included in ngw_lea already. For N run-off, land use effect is not included in other sub-indicators.