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STUDY ON TRANSFERENCE OF ASSIMILATE IN FILLING SUMMER MAIZE USING ISOTOPE 14 C NITROGEN TRANSFER VIA VA MYCORRHIZA HYPHAE LINK BETWEEN ROOTS OF RED CLOVER EFFECT OF POTASSIUM SALTS ON THE TRANSFER OF 137Cs\=IN SOILPLANT SYSTEM THE MOVING FEATURE OF 15 N IN COTTON FIELD WITH DIFFERENT SOIL TEXTURE