Contribution of a-amino N to extractable organic nitrogen (DON) in three soil types from Scottish uplands.
| MSI05P4188 | |
| Paul, J. P. Williams, B. L. | |
| Contribution of a-amino N to extractable organic nitrogen (DON) in three soil types from Scottish uplands. | |
| periodical article | |
| 2005 | |
| Soil Biol. Biochem. | |
| 37: 801-803 | |
| En | |
| En | |
| Organic nitrogen (DON) was extracted from two improved pasture soils, one of which had been re-colonized by acid heath vegetation, and a blanket peat. Although the quantities extracted in H2O, 10 mM CaCl2, 500 mM K2SO4 and 50 mM Na2HPO4 were not consistent, mean extractable DON as a proportion of total N was greater in the two grazed pastures (0.4 percent) than in the peat (0.2 per cent) Averaged over the four extractants, free a-amino N was greater in the peat and least in the improved pasture soil and accounted for 26 per cent of DON in the peat and less than 5 per cent in the mineral soil. Amino N increased after 6 M HCl hydrolysis, and this combined N contributed 56 per cent to DON in extracts of the mineral soil compared with only 36 per cent in the peat This variation in the relative contributions of free and combined amino N to DON indicated qualitative differences in the composition of DON between the three soils. | |
| a-Amino N Extractable organic nitrogen Free amino N Organic soils Nitrogen soils | |
| Scotland | |
| Soils and plant nutrition | |
| Fertilization: Nitrogen | |
| 2006-01-17 | |
| En | |
| LIB | |
| CAT | |
| CHEm |