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TRANSLOCATION AND DISTRIBUTION OF ￣14C-PHOTOSYNTHATE IN ASPARAGUS BEAN [Vigna unguiculata W. ssp.sesquipedals(L.) Verd] STUDIES ON THE ABSORPTION, DISTRIBUTION OF RARE EARTH ELEMENTS AND ITS EFFECT ON ABSORPTION OF PHOSPHORUS AND POTASSIUM IN SUGARCANE (Saccharum officnarum L.) The effects of nitrogen topdressing stage on photosynthesis, translocation and distribution of14C assimilate and NR activity of wheat BARKED REGENERATION MECHANISM OF Phellodendron chinense var.glabriusculum SCHNEID BY USING ~(14)C-TRACER METHOD