Characteristics of nitrogen utilization and source of Hevea brasiliensis under different nitrogen levels[J]. Guangdong Agricultural Sciences, 2017, 44(11): 75-79. DOI: 10.16768/j.issn.1004-874X.2017.11.012
    Citation: Characteristics of nitrogen utilization and source of Hevea brasiliensis under different nitrogen levels[J]. Guangdong Agricultural Sciences, 2017, 44(11): 75-79. DOI: 10.16768/j.issn.1004-874X.2017.11.012

    Characteristics of nitrogen utilization and source of Hevea brasiliensis under different nitrogen levels

    • 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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