Light fraction organic N, ammonium, nitrate and total N in a thin Black Chernozemic soil under bromegrass after 27 annual applications of different N rates

被引:1
作者
S.S. Malhi
K.S. Gill
J.T. Harapiak
M. Nyborg
E.G. Gregorich
C.M. Monreal
机构
[1] Agriculture and Agri-Food Canada,Department of Renewable Resources
[2] Western Co-operative Fertilizers Limited,Research Centre
[3] University of Alberta,undefined
[4] Agriculture and Agri-Food Canada,undefined
[5] Soil Plant Water Consulting Inc.,undefined
[6] AgriPlace,undefined
来源
Nutrient Cycling in Agroecosystems | 2003年 / 65卷
关键词
Bromegrass; Light fraction N; N fertilization; NH; -N; NO; -N; Soil; Total N;
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摘要
Anadequate supply of N for a crop depends among others on the amounts of N thataremineralized from the soil organic matter plus the supply of ammonium andnitrateN already present in the soil. The objective of this study was to determine thebehaviour of light fraction organic N (LFN), NH4-N, NO3-Nand total N (TN) in soil in response to different rates of fertilizer Napplication. The 0–5, 5–10, 10–15 and 15–30cm layers of a thin Black Chernozemic soil under bromegrass(Bromus inermis Leyss) at Crossfield, Alberta, Canada,weresampled after 27 annual applications of ammonium nitrate at rates of 0, 56,112,168, 224 and 336 kg N ha−1. The concentration andmass of TN and LFN in the soil, and the proportion of LFN mass within the TNmass usually increased with N rates up to 224 kg Nha−1. The increase in TN mass and LFN mass per unit ofNadded was generally maximum at 56 kg N ha−1 anddeclined with further increases in the rate of N application. The percentchangein response to N application was much greater for the LFN mass than for the TNmass for all the N rates and all soil depths that were sampled. Mineral N intheform of NH4-N and NO3-N did not accumulate in the soil at≤ 112 kg N ha−1 rates, whereas theiraccumulation increased markedly with rates of ≥ 168 kg Nha−1. In conclusion, long-term annual fertilization at≤ 112 kg N ha−1 to bromegrass resulted insubstantial increase in the TN and LFN in soil, with no accumulation ofNH4-N and NO3-N down the depth. The implication of thesefindings is that grasslands for hay can be managed by appropriate Nfertilization rates to increase the level of organic N in soil.
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页码:201 / 210
页数:9
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