Using 15N Isotope Technique for Study the Balance of Nitrogen Fertilizer in Young Rubber Tree -Hevea Brasilliencis
Keywords:
15Na.e, Ndff, N fertilizer, rubber RRIV 214, 15N isotope.Abstract
The pot experiment was conducted in late rainy season in the South of Vietnam to determine influence of 2gN/pot to %Na.e, Ndff and movement of N fertilizer in soil by using 15N isotope technique. There were big differences of 15Na.e, Ndff and Fertilizer N utilization in leaf, stem and root. 15Na.e of stem and leaf at 0.19% were higher than the one in root at 0.16%. Similarly, amount of Ndff also was highest in leaf at 0.331 g/pot. Total amount of N derived from fertilizer was 0.432g/pot and it means fertilizer N utilization was 21.09% while loses occupied very high at 44.75%. At the end of the study 90 days, N fertilizer had residue in soil at 25% and approximately 9.16% of N fertilizer was unaccounted.
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