. Cranberries; : the national cranberry magazine. Cranberries. season. Phosphorusâslight red coloration of stem and leaves of the rapidly growing shoot. The coloring is not associated with the latest leaves but is evident on all new leaves along the growing shoot. In nutrient solution the roots are very dark in color. In the field we have observed these symptoms only in plots on virgin peat soil with no supplemental fertilization. Potassium-this deficiency first showed as reddening of the leaf margins at the tip of the growing shoot. A slow growth rate and short- ening internodes produced a ro
. Cranberries; : the national cranberry magazine. Cranberries. season. Phosphorusâslight red coloration of stem and leaves of the rapidly growing shoot. The coloring is not associated with the latest leaves but is evident on all new leaves along the growing shoot. In nutrient solution the roots are very dark in color. In the field we have observed these symptoms only in plots on virgin peat soil with no supplemental fertilization. Potassium-this deficiency first showed as reddening of the leaf margins at the tip of the growing shoot. A slow growth rate and short- ening internodes produced a rosette of leaves at the apex with reddish leaf margins, the whole effect resembling a miniature tuUp flower. Continued growth under deficiency conditions resulted in slow degeneration and necrosis of leaves and plant death. These symptoms have never been reported from field observations. Calcium-first evidence of deficiency is a marginal reddening of the apical 6-8 leaves on rapidly growing shoots. Further red color develops wdth increasing intensity from the tip toward the leaf base. An affected leaf dies within a few days and the entire tip of the shoot dies and turns brown. Magnesium-a dark mottling of the older leaves on the shoot followed by marginal necrotic spots on the same leaves. Continued growth in a deficient condition results in dropping of the oldest injured leaves and slow progression of damage acropetally (base to tip). Ironâa chlorosis of all the new growth with decreasing intensity from the tip to the base of the shoot. The symptoms were obvious within 25 days after removal of the iron supply to the plants. Sulfurâthe first symptom after 25 days was a slight chlorosis with slight reddening on some leaf margins. After six weeks the first affected leaves were red and speckled with small necrotic lesions and new leaves were chlorotic. At nine weeks the oldest leaves died and fell from the plants. Boron-deficiency symptoms were evident only after eight weeks of
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