Studies were conducted in chlorotic trees of Sathgudi orange to find out the physiological components of chlorosis. The results revealed that the chlorotic leaves recorded low levels of zinc. iron and manganese and a higher activity of chlorophyllase and thus low chlorophyll content (yellowing of leaves). Reduced photosynthetic rate combined with low yield was recorded in chlorotic trees. Correlation analysis revealed that chlorosis had positive association with chlorophyllase activity and negative association with zinc, iron and manganese content. photosynthetic rate, chlorophyll content and yield.
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