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| Characteristics of nitrogen utilization and source of Hevea brasiliensis under different nitrogen levels |
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| DOI：10.16768/j.issn.1004-874X.2017.11.012 |
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| Abstract: |
| The characteristics of nitrogen utilization and source of Rubber cultivar（ Yunyan 774） under
different nitrogen levels，including 2.0 g perpot，4.0 g perpot and 6.0 g perpot，were explored through pot experiment
by 15N urea isotope labeling，respectively. The results showed that with the increase of N supply，the dry matter
accumulation and nitrogen residue as well as residue rate of rubber cultivar increased，while the nitrogen utilization
rate decreased（N2 37.45% ＞ N4 26.33% ＞ N6 21.22%）. The dry matter accumulation order of various organs of
rubber under different nitrogen levels was stem > root > leaf；The nitrogen content order of nitrogen fertilizers was leaf
> stem > root；The utilization rate order of nitrogen fertilizer in leaves was the largest，followed by stems and roots.
There was the highest fertilizer nitrogen and total nitrogen in leaves，which had the highest distribution rate as well as
the strongest absorption competitive ability of fertilizer nitrogen. |
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