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Nitrogen application rate and nitrous oxide flux from a pastoral soil
| Content Provider | Scilit |
|---|---|
| Author | Kelliher, Fm Li, Z. Nobel, Adl |
| Copyright Year | 2014 |
| Description | Nitrogen (N) can be lost to the atmosphere by nitrous oxide $(N_{2}$O) flux from soils. For pastoral soils, N is applied in N fertiliser and excreta deposited by farmed, grazing animals. We postulated that soil $N_{2}$O flux would be linearly related to the N application rate (Nrate). As a test, we applied eight treatments as rates of urea (0–1500 kg N $ha^{−1}$) to samples of a pastoral soil and measured the $N_{2}$O flux, pH and ammonium (NH_{4}$^{+}$) and nitrate (NO_{3}$^{−}$) concentrations at intervals for 67 days. When fluxes were accumulated, the variability or variance of treated replicates increased with time and increasing Nrate. For 67-day, cumulative $N_{2}$O fluxes, a linear regression with the N application rate, weighted by the inverse of the replicates' variance, yielded a statistically significant relationship (P < 0.05), accounting for 92% of the variability. A second-order term was too small to be statistically significant for another regression using a polynomial function. Thus, there was no evidence to reject the linear hypothesis. The fluxes were also related to the pH and (NH_{4}$^{+}$ + NO_{3}$^{−}$) concentration. These relationships warrant further study in different soils under field conditions. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/00288233.2014.927772?needAccess=true |
| Ending Page | 376 |
| Page Count | 7 |
| Starting Page | 370 |
| ISSN | 00288233 |
| e-ISSN | 11758775 |
| DOI | 10.1080/00288233.2014.927772 |
| Journal | New Zealand Journal of Agricultural Research |
| Issue Number | 4 |
| Volume Number | 57 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2014-07-03 |
| Access Restriction | Open |
| Subject Keyword | Soil Science Nitrogen Fertiliser Nitrous Oxide |
| Content Type | Text |
| Resource Type | Article |
| Subject | Agronomy and Crop Science Soil Science Plant Science Animal Science and Zoology |
