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Characteristics of absorption, distribution and utilization of 15N in Red Globle Grape under fertilizer application in different depths EFFECT OF AUTUMN FOLIAR APPLICATION OF ~(15)N-UREA ON ABSORPTION, TRANSLOCATLON, STORAGE AND REDISTRIBUTION OF ~(15)N IN YOUNGVitis amurensis Rupr Nitrogen Absorption and Allocation in Catapla bungei Clones Using the Technique of 15N-tracing