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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2004.8650
Last checked: 02/28/2024
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https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2004.8650
Last checked: 02/28/2024
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| Publication Type:
| Refereed |
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| Author(s): | Jenkinson, D. S.;
Poulton, P. R.;
Johnston, A. E.;
Powlson, D. S. |
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| Title: | Turnover of nitrogen-15-labeled fertilizer in old grassland |
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| Source: | Soil Science Society of America Journal. Vol. 68, No. 3, May/June 2004, p. 865-875. |
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| Publishing Information: | Madison, WI: Soil Science Society of America |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Fertilizers; Grasslands; Nitrogen; Biomass; Application; Nitrogen fertilizers
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| Abstract/Contents: | "In this paper we follow the fate of single applications of 15N-labeled fertilizer to old grassland, over a period of nearly 20 yr. In 1980 and 1981, 15N-labeled N was applied to two of the treatments on the Park Grass Continuous Hay Experiment at Rothamsted, started in 1856. The labeled N was applied at the same rate (nominally 96 kg ha-1 yr-1) and in the same chemical form (NH4 or NO3) as the unlabeled N normally applied as fertilizer to the selected treatments. After 19 yr, 69.6% of the N applied in 1980 as 15NH4 had been harvested in successive cuts of herbage, with a further 16.5% remaining in the soil. For 15NO3, 64.3% had been harvested and 13.8% remained in the soil. The 15N data were then used to calculate annual inputs of nonfertilizer N, annual losses of N and N turnover times in old grassland, assuming that the selected treatments were under steady-state conditions. The annual input of N from nonfertilizer sources (rain, dry, deposition, N fixation by leguminous components of the herbage, etc.) was large: 39 kg N ha-1yr-1 for the NH4 treatment and 31 kg for the NO3 treatments. Leguminous plants made up <2% of the herbage in both the NH4 and NO3 treatment. The annual loss from the NH4 treatment was 19 kg N ha-1 yr-1 and 24 from the NO3 treatment. The gross turnover time of N in the root compartment (which included plant crowns) was 1.41 yr for the NH4 treatment and 0.42 yr for NO3. The gross turnover time of soil microbial N was 2.13 yr. (NH4) and 1.83 yr (NO3): for humus N (i.e., soil N not in roots or microbial biomass) it was 181 yr (NH4) and 116 yr (NO3)." |
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| Language: | English |
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| References: | 46 |
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| Note: | Tables
Graphs
Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jenkinson, D. S., P. R. Poulton, A. E. Johnston, and D. S. Powlson. 2004. Turnover of nitrogen-15-labeled fertilizer in old grassland. Soil Sci. Soc. Am. J. 68(3):p. 865-875. |
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| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2004.8650
Last checked: 02/28/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2004.8650
Last checked: 02/28/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 590 .S65 |
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