Influence of Nitrogen and Phosphorus on Shoot:Root Ratio of Ilex crenata Thunb. ‘Helleri’1

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Abstract
Higher N rates applied to Ilex crenata‘ Helleri’ holly liners grown in the greenhouse increased shoot growth but-decreased root growth resulting in a greater shoot:root ratio. Higher N rates reduced the time required for a shoot growth flush to occur. Ρ at 85-500 ppm had no effect on shoot or root growth. Continued growth of liners at 50 ppm N lowered the shoot:root ratio due to stimulation of root growth while 300 ppm N caused the shoot:root ratio to increase due to increased shoot growth.

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