Evaluation of Temperature - Tolerant Azolla Strains Suitable for Tiruvallur District

The survey on Azolla diversity revealed that pinnata and microphylla are the two species found throughout agro-climatic zones of Tamil Nadu.The pot-culture experiments to screen strains for local adaptability Tiruvallur district during cold months (Nov-Dec), most grow with high growth rate (5 7 days doubling time) Jan-Feb, time increased from 7.5 9.5 days.Among different studied, A. recorded a rates higher biomass production at elevated temperatures. Selected were highly suitable well under open field conditions.Azolla high-temperature zone Nadu (Tiruvallur) identified. These can withstand temperature up 37°C in July – Aug produce application (Dual crop) 75 per cent recommended dose NPK as maximum grain straw yield rice followed by pinnata(dual NPK. could be used animal feed also green manure.