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A ‘V’-pattemed chlorosis of older leaves is frequently observed on specific cultivars of container-grown Camellia sasanqua. Symptoms are expressed during the flowering period and as the first vegetative flush of the season develops in early spring. Symptomatic leaves eventually senesce and subsequent vegetative flushes appear healthy. In the following study, container-grown Camellia sasanqua ‘Shishi Gashira’ were fertilized with 500 ml of nutrient solution containing one of five treatments: 0.0, 4.0, 10, 20, or 40 g/liter magnesium sulfate heptahydrate (MgSO4·7H2O) per 19-liter container every two weeks for nine months to determine if chlorosis could be prevented. Nutrient analyses were conducted on all plant organs to determine if there was a correlation between nutrient partitioning to different organs and the expression of leaf chlorosis. Supplemental MgSO4·7H2O fertilization increased the Mg concentration in the roots, stems, leaves and flowers, and increased the sulfur concentration only in the leaves and stems. Calcium concentration in all organs decreased and potassium concentration in the leaves and stems decreased with increased fertilization rates. Fertilization with MgSO4·7H2O prevented the development of ‘V’-patterned chlorosis but did not affect plant dry weight.

Effects of Magnesium-Sulfate on Leaf Chlorosis, Plant Growth and Nutrient Uptake in Camellia sasanqua ‘Shishi Gashira’