CRANBERRY NUTRITION: ZINC
Shoot growth increased rapidly with an increase in shoot zinc concentration from 7 to 15 ppm, with no further increase in yield as concentration increased to approximately 50 ppm. These data support a critical zinc concentration of 13 ppm in cranberry shoot tissue.
Normal growing cranberry plants developed zinc deficiency symptoms about 2 weeks after transfer to minus zinc nutrient solutions. These symptoms appeared as a reddening of the newly developed leaves and stem with an occastional red streaking in older leaves. The symptoms became more severe with time.