Table 5. Parameter estimates for the insoluble nitrogen (ISN) model.
| Parameter | FAS-ISN1 | UTS-ISN | DG-ISN | |||
|---|---|---|---|---|---|---|
| Estimate | FSD2 | Estimate | FSD | Estimate | FSD | |
| ks_AN-MN3, /h | 0.152 | 0.126 | 0.241 | 0.153 | 0.350 | 0.123 |
| kr_MN-AN4, /h | 0.072 | 0.165 | 0.084 | 0.215 | 0.072 | 0.182 |
| P15 | 0.355 | 0.041 | 0.295 | 0.093 | 0.314 | 0.098 |
1 FAS-SN = insoluble N fraction (ISN) of formic acid-treated unlabelled grass silage, UTS-ISN = ISN of untreated unlabelled grass silage, DG-ISN = SN of unlabelled dried grass.
2 FSD = fractional standard deviation (SD / mean).
3 ks_AN-MN = rate of microbial N synthesis from ammonia N.
4 kr_MN-AN = rate of microbial N recycling to ammonia N.
5 P1 = proportion of ammonia N immediately taken up by microbes.