The activities of foliar invertases and amylases during growth of sugarcane genotypes in relation to the contents of sucrose and hexoses in leaf blade and stem were estimated in plant and ratoon crops. Sucrose contents in leaf blade were higher in ratoon crop as compared to plant crop at all the physiological stages of growth. The level of hexoses in leaf was more in plant crop at ripening stage, Ratoon crop had higher foliar enzymatic activities at initial stages of growth, whereas, plant crop had higher foliar enzymatic activities at ripening stage of growth. The enzymatic activities were closely related to the accumulation of sucrose and reducing sugars in leaves and stalk. Ratoon crop reached its maximum potential of sucrose accumulation earlier than plant crop.
