## 2.21.4. Management modifiers on decomposition rate[¶](#management-modifiers-on-decomposition-rate "Permalink to this headline")
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Tillage of cropland soil is represented as an additional rate scalar that depends on tillage intensity (default off), soil pool, and time since planting [(Graham et al., 2021)](https://escomp.github.io/ctsm-docs/versions/master/html/tech_note/References/CLM50_Tech_Note_References.html#grahametal2021). The tillage enhancement is strongest in the first 14 days after planting (idpp < 15), weaker in the next 30 days (15 ≤ idpp < 45), weaker still in the next 30 days (45 ≤ idpp < 75), and nonexistent after that (idpp ≥ 75).

Table 2.21.5 Tillage decomposition rate scalars. Values in each cell represent enhancement in different periods of days past planting: \[0, 14\], \[15, 44\], \[45, 74\].[¶](#id7 "Permalink to this table")   
|  | low
 | high

 |
| --- | --- | --- |
| Litter 2 (cel\_lit)

 | 1.5, 1.5, 1.1

 | 1.8, 1.5, 1.1

 |
| Litter 3 (lig\_lit)

 | 1.5, 1.5, 1.1

 | 1.8, 1.5, 1.1

 |
| SOM 1 (act\_som)

 | 1.0, 1.0, 1.0

 | 1.2, 1.0, 1.0

 |
| SOM 2 (slo\_som)

 | 3.0, 1.6, 1.3

 | 4.8, 3.5, 2.5

 |
| SOM 3 (pas\_som)

 | 3.0, 1.6, 1.3

 | 4.8, 3.5, 2.5

 |