> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/swat+-output-files/carbon/output-files-generated-by-hru_cb_vars.md).

# Output Files Generated by hru\_cb\_vars

<table><thead><tr><th width="173">Output Files</th><th>Description</th></tr></thead><tbody><tr><td>hru_carb_vars</td><td><p>This command generates soil carbon variables (e.g., biomixing/tillage effect, fractions of carbon transformations, etc.).</p><ul><li><em>sut - soil water factor (0-1)</em></li><li><em>tillagef - combined tillage effect (tillage + biomixing)</em></li><li><em>tillagef_biomix - biomixing effect (component of tillagef)</em></li><li><em>tillagef_tillmix - tillage effect (component of tillagef)</em></li><li><em>till_eff - tillage effect factor (1~15)</em></li><li><em>cdg - soil temperature factor (0-1)</em></li><li><em>ox - soil oxygen factor (0-1)</em></li><li><em>cs - combined factor integrating sut, till_eff, cdg, and ox (1~15)</em></li><li><em>no3 - [currently not in use]</em></li><li><em>nh4 - [currently not in use]</em></li><li><em>co2_resp - CO</em><sub><em>2</em></sub><em> respiration (kg/ha)</em></li><li><em>soil_temp - soil temperature in centigrade</em> </li><li><em>emix- [currently not in use]</em></li></ul></td></tr><tr><td>hru_org_allo_vars</td><td><p>This command generates soil organic carbon (SOC) allocation variables by pools.</p><ul><li><em>abp - fraction of flux allocated from microbial pool to passive humus pool (remainder to slow humus pool)</em></li><li><em>asp - fraction of flux allocated from slow humus pool to passive humus pool (remainder to microbial biomass pool)</em></li><li><em>abco2 - fraction of actual transformed microbial pool carbon respired as CO</em><sub><em>2</em></sub></li><li><em>a1co2 - fraction of actual transformed metabolic and non-lignin litter pool carbon respired as CO</em><sub><em>2</em></sub></li><li><em>asco2 - fraction of actual transformed slow pool carbon respired as CO</em><sub><em>2</em></sub></li><li><em>apco2 - fraction of actual transformed passive pool carbon respired as CO</em><sub><em>2</em></sub></li></ul></td></tr><tr><td>hru_org_ratio_vars</td><td><ul><li><em>ncbm - microbial biomass N:C ratio</em></li><li><em>nchp - passive humus N:C ratio</em></li><li><em>nchs - slow humus N:C ratio</em></li></ul></td></tr><tr><td>hru_org_trans_vars</td><td><ul><li><em>bmctp - potential transformation of microbial biomass C</em>
</li><li><em>bmntp - potential transformation of microbial biomass N</em>
</li><li><em>hsctp - potential transformation of slow humus C</em>
</li><li><em>hsntp - potential transformation of slow humus N</em>
</li><li><em>hpctp - potential transformation of passive humus C</em>
</li><li><em>hpntp - potential transformation of passive humus N</em>
</li><li><em>lmctp - potential transformation of metabolic litter C</em>
</li><li><em>lmntp - potential transformation of metabolic litter N</em>
</li><li><em>lsctp - potential transformation of structural litter C</em>
</li><li><em>lslctp - potential transformation of lignin structural litter C</em>
</li><li><em>lslnctp - potential transformation of non-lignin structural litter C</em>
</li><li><em>lsntp - potential transformation of structural litter N</em></li></ul></td></tr></tbody></table>