A dataset of fertilizer and organic matter addition types and their nitrogen and carbon composition, based on the SWAT model's `fertilizer.frt` table and DayCent model defaults for organic matter C:N ratio parameters.
Format
A tibble with one row per fertilizer type and the following columns:
- name
character. Short identifier from SWAT (e.g.,"urea","manure").- description
character. Longer description of the fertilizer or manure type.- fraction_mineral_n
numeric. Fraction of total nitrogen in mineral form.- fraction_nh3_n
numeric. Fraction of fertilizer by mass that is ammonium-n (NH\(_3\)-N).- fraction_no3_n
numeric. Fraction of fertilizer by mass that is nitrate-N (NO\(_3\)-N). Computed asfraction_mineral_n - fraction_nh3_n.- fraction_organic_n
numeric. Fraction of organic matter that is nitrogen.- fraction_c
numeric. Fraction of mass that is carbon.- cn_ratio
numeric. Carbon-to-nitrogen ratio for organic matter. Assigned based on DayCent organic matter parameterterizations.
Source
https://github.com/swat-model/swatplus
DayCent model default parameter file: `omad.100` obtained from the Soil Carbon Solutions Center, https://www.soilcarbonsolutionscenter.com
Details
This table is based on SWAT model's fertilizer.frt file, and uses
C:N ratios (cn_ratio) from DayCent model default parameter files.
fraction_nh3_n and fraction_no3_n represent the fraction of
fertilizer by mass that is ammonium-N and nitrate-N, respectively. This is different from
the SWAT model's definition of fraction_nh3_n as a fraction of the total mineral N.