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  • Author or Editor: R. D. Fitzgerald x
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Fall applications of K and NH 4 + or NO 3 forms of N did not significantly affect the cold hardiness of Ilex crenata ‘Hetzi’ roots. The fertilizer treatments resulted in variations in leaf total N from 1.66% to 3.26% and leaf K from 0.85% to 1.25% in Jan. Natural freezing of the container media during Dec. and Jan. did not significantly increase the cold hardiness of the roots. Hardiness test results with the triphenyl tetrazolium chloride (TTC) method agreed closely with results from survival tests with intact plants.

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