Development of deficiency symptoms and fixing critical levels of micronutrients in karonda (Carissa carandas L.)
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Date
2008-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was carried out at the Department of Horticulture, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Udham Singh Nagar, Uttarakhand in completely randomized block design with three replication during September, 2005 and July 2006. Results of the present investigation revealed that iron deficiency reduced the height of seedling, number of leaves per seedling, length and breadth of leaf, fresh and dry weight of leaf, leaf area per seedling, stem girth of seedling, length of primary root, chlorophyll ‘a’, ‘b’ and total chlorophyll content. Similar observations were recorded for boron and zinc except non-significant effect on chlorophyll ‘a’, ‘b’ and total chlorophyll content due to boron and on length of primary root due to zinc. Increased iron levels in the nutrient solution affected leaf nitrogen, phosphorus, potassium, iron and zinc content significantly but calcium, magnesium, sulphur, copper, manganese and boron content remained unaffected. Increased boron levels, raised leaf nitrogen, phosphorus, potassium and calcium content significantly but leaf magnesium, sulphur, copper, iron, manganese, zinc and boron content did not influence by various levels of boron in nutrient solution. Various levels of zinc affected the leaf nitrogen, phosphorus, potassium, copper, iron and zinc content on all the dates of observation except first date of observation. Deficient levels of zinc increased leaf phosphorus, copper and iron content because zinc showed antagonistic with these nutrients. Leaf calcium, magnesium, sulphur, manganese and boron did not influence significantly when different levels of zinc were applied in nutrient solution under sand culture study. By applying differential treatments of iron, boron and zinc, characteristic deficiency symptoms of each of three elements were developed and studied. Leaf analysis has been done to find out critical level of iron, boron and zinc in the leaf as 137 ppm, 41 ppm and 123 ppm, respectively. Therefore, it is suggested that to avoid and overcome the nutritional problems of iron, boron and zinc in Karonda, the leaf content of any of the three elements should not fall below the above mentioned levels by balanced and timely nutrient supplementation.
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Thesis-PhD
Keywords
deficiency diseases, trace elements, Carissa carandas