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Yields, Market Values and N Use Efficiency in Fluecured Tobacco Influenced by Time of Basal N Fertilization A REVIEW ON THE BEHAVIOR OF()~7Be IN ECOSYSTEM PROBLEMS AND SUGGESTION ON RADIOISOTOPE TRACING EXPERIMENT Effects of Nitrogen Application on Yield Formation and the Nitrogen Absorption and Utilization of Super Rice Based on 15N-tracing THE EXPLORATION OF NEW SYSTEM OF ISOTOPE TRACING TECHNIQUE IN CHINA PHARMACOKINETICS OF PEGYLATED RECOMBINAN NEW HUMAN INTERLEUKIN-6 (PEG-rhIL-6) ABSORPTION AND UTILIZATION OF FERTILIZER-N AND SOIL-N WITH MIXED APPLICATION OF STRAW AND UREA BY RICE