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Asian Journal of Biochemistry

Year: 2011  |  Volume: 6  |  Issue: 3  |  Page No.: 273 - 281

Impact of Different Sources and Doses of Magnesium Fertilizer on Biochemical Constituents and Quality Parameters of Black Tea

S. Jayaganesh, S. Venkatesan and V.K. Senthurpandian


A study was conducted with different sources of magnesium fertilizers on biochemical parameters like chlorophyll, carotenoids, polyphenols, catechins and amino acid of green leaves in tea. Amino acid and polyphenols are increased due to magnesium sulphate application. Among the various treatments, the application of magnesium sulphate along with reduction of potassium input decreased the biochemical parameters. The content of chlorophyll and carotenoids were higher in magnesium sulphate applied blocks followed by kieserite application. Catechin content was higher due to kieserite and magnesium sulphate applications. After one year of experimentation, the leaf samples collected from the experimental blocks were mini manufactured and analysed for their quality parameters. Theaflavins, thearubigins, total liquor colour and highly polymerised substances were higher in magnesium sulphate and kieserite applied plots. TLC and HPS were higher due to magnesium sulphate application. The different sources of soil applied magnesium directly influenced the amino acid content made of tea and it was higher in magnesium sulphate and magnesium nitrate applied blocks. Flavor index was also estimated for price realization in made tea and it increased due to soil application of magnesium. Among different sources, magnesium sulphate has yielded higher amount of flavor followed by kieserite application. Application as per standard practices along with 50% reduction of potassium fertilizer yielded higher amount of CFC. Water extract content was higher in magnesium sulphate applied blocks and lower in magnesium nitrate application. Green leaf yield and organoleptic evaluation revealed that among different source like magnesium sulphate, magnesite, magnesium nitrate and kieserite, the cost benefit ratio was higher for magnesium sulphate.

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