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Study of calcium assimilation and distribution characteristics in flue-cured tobacco upon different applying amount of fertilizer by ~(45)Ca THE EFFECT OF SOIL VOLUMETRIC WEIGHT ON NITROGEN SUPPLYING ABILITY OF SOIL AND ABSORPTION,UTILIZATION OF NITROGEN BY COTTON DYNAMIC OF DEGRADATION AND DISAPPEARANCE OF MONOCROTOPHOS IN SUBMERGED SOIL The clonal integration of photosynthates in the rhizomatous half-shrub Hedysarum laeve PROSPECT AND CURRENT SITUATION SURVEY OF NUCLEAR AGRICULTURAL RESEARCH IN CHINA The role of the isotope tracer technique in ecological research of arbuscular mycorrhizal fungi Dynamic absorption of iodine-125 in Chinese cabbage (Brassica chinesis L.) CHARACTERISTICS OF TRANSPORTATION AND DISTRIBUTION OF PHOTOASSIMILATES IN SUPER HYBRID RICE COMBINATIONS QUADRATIC TRACER DYNAMICAL MODELS FOR TOBACCO GROWTH THE KINETIC BEHAVIOUR OF STRONTIUM-89 IN THE SIMULATION PADDY STUDIES ON NITROGEN UPTAKE AND UTILIZATION BY RAPE (Brassica napus L.) UNDER DIFFERENT SOWING DATES