TABLE 3.
Changes in soil biochemical traits under the combined manure and mineral N fertilization.
| pH (water) | SOC (g kg–1) | TN (g kg–1) | MBC (mg kg–1) | MBN (mg kg–1) | ||
| Year | Treatment | |||||
| 2019 | Neg-Con | 5.93c | 14.74b | 1.40c | 170d | 23.34d |
| Pos-Con | 5.91c | 15.08b | 1.41c | 220c | 31.44c | |
| High-CM | 6.25a | 19.24a | 1.78a | 340a | 44.67a | |
| Low-CM | 6.12b | 16.81b | 1.67b | 310b | 38.43b | |
| High-PM | 6.23a | 18.92a | 1.77a | 341a | 43.89a | |
| Low-PM | 6.13b | 16.88b | 1.64b | 315b | 39.44b | |
| 2020 | Neg-Con | 5.95d | 14.88c | 1.40d | 175d | 24.52e |
| Pos-Con | 5.94d | 15.52c | 1.44c | 235c | 34.45d | |
| High-CM | 6.31a | 24.74a | 1.99a | 370a | 51.42ab | |
| Low-CM | 6.18c | 22.25b | 1.81b | 355b | 43.36c | |
| High-PM | 6.28ab | 25.05a | 1.98a | 374a | 54.58a | |
| Low-PM | 6.16c | 21.77b | 1.80b | 311b | 41.35c |
SOC, soil organic carbon; TN, total nitrogen; MBC, microbial biomass carbon; MBN, microbial biomass nitrogen; Neg-Con, control; Pos-Con, 100% chemical fertilizer (CF); High-CM, 60% cattle manure (CM) + 40% (CF); Low-CM, 30% CF + 70% CF; High-PM, 60% poultry manure (PM) + 40% CF; Low-PM, 30% PM + 70% CF.
The mean comparison was made using Tukey tests for treatment mean in both years and the lettering was done based on the Tukey HSD test at 5% using a simple effect.
Values followed by the same letters within the column are statistically the same at P ≤ 0.05.