TABLE 3.
Mean soluble carbon values on day 40 for each combination of year, amendment type, and mulch type
| Sample typea | Soluble carbon on day 40 (mg/kg)b | Confidence interval |
|---|---|---|
| 2018.CPL.M | 71.4 CDEF | 53.2–95.7 |
| 2018.CPL.NoM | 67.5 CDEF | 50.2–90.8 |
| 2018.HTPP.M | 217.0 A | 168.5–280.2 |
| 2018.HTPP.NoM | 133.0 ABC | 101.9–173.8 |
| 2018.PL.M | 202.0 A | 156.6–261.3 |
| 2018.PL.NoM | 67.9 CDEF | 50.5–91.2 |
| 2018.UN.M | 54.5 DEF | 40–74.3 |
| 2018.UN.NoM | 56.6 DEF | 41.7–77 |
| 2019.CPL.M | 57.9 CDEF | 42.7–78.6 |
| 2019.CPL.NoM | 38.2 F | 27.3–53.4 |
| 2019.HTPP.M | 175.0 AB | 135.4–227.3 |
| 2019.HTPP.NoM | 101.0 ABCDE | 76.2–132.6 |
| 2019.PL.M | 108.0 ABCDE | 82.4–142.5 |
| 2019.PL.NoM | 112.0 ABCD | 84.9–146.6 |
| 2019.UN.M | 45.6 EF | 33.1–63 |
| 2019.UN.NoM | 82.8 BCDEF | 62.2–110.1 |
a
Sample types are described as “year/amendment type/mulch type.” CPL, composted poultry litter; HTTP, heat-treated poultry pellet; PL, poultry litter; UN, no biological amendment; M, black plastic mulch; NoM; no mulch.
b
Different uppercase letters indicate statistically significant (P < 0.05) differences in mean values for specified combinations of year, amendment type, and mulch type.