Studies on irrigation water quality and coleus yield traits and yield on various coleus growing agro climatic zones of Tamil Nadu (Coleus forskohlii)

A field survey was under taken to study the irrigation water quality on yield variation of coleus in various coleus growing agro climatic zones of Tamil Nadu, for that bench mark detailed irrigation water survey was conducted in high, medium and low yielding villages of coleus growing five agro climatic zones namely north eastern, hill area, north western, western and southern agro climatic zones of Tamil Nadu during the year 2012-13 where coleus crops growing regularly during Sep-Oct months every year. About 44 irrigation water samples were drawn from wells and subjected to detailed analysis in the laboratory following the standard procedure for pH, EC, anions (carbonate, bicarbonate, chloride and sulphate), cations (calcium, magnesium, sodium and potassium), and computation of indicators like residual sodium carbonate (RSC), sodium adsorption ratio (SAR), magnesium calcium ratio and geo chemical type etc. The analytical results revealed that 35 water samples Electrical conductivity is less than 1.0. Eight samples recorded EC value of 1-2 and only one water sample recorded EC value of 2-4 range. Regarding geochemical type 22 samples recorded Magnesium bicarbonate type geochemical type, 3 samples recorded Magnesium chloride type, five samples recorded calcium chloride geochemical type and14 samples recorded calcium bi carbonate geo chemical type.

Author(s): V Balasubramanian and M Jegadesan

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