ROLE OF BLUE GREEN ALGAL SYSTEM IN MINIMIZING METHANE FLUX FROM RICE SOILSA. LAKSHMANAN, A. SANKAR, V. GEETHALAKSHMI, P. LATHA AND N.U. SEKHAR
Global warming induced by increasing concentration of greenhouse gases (GHGs) in the atmosphere is a matter of great environmental concern. A field experiment was conducted at Anbil Dharmalingam Agricultural College and Research Institute, Trichy, Tamil Nadu, India during the Rabi seasons of 2010-11, to study the methane emission rates from rice field under different organic amendments using rice variety TNAU (R) TRY1 with the duration of 135 days. Treatments involved were T1- Control, T2-Blue Green Algae, T3-Azolla, T4-Farm Yard Manure, T5-Green Leaf Manure, T6-Blue Green Algae + Azolla, T7-Farm Yard Manure + Green Leaf Manure, T8- Blue Green Algae + Azolla + Farm Yard Manure + Green Leaf Manure. Plant-mediated CH4 emission flux from the experimental plots was measured by closed chamber method at 15 days intervals. In the present study, combined application of organics and blue green algae not only recorded higher yield, but found to emit less methane in paddy cultivation than the application of organics alone. Hence, this study reiterates that biofertilization of paddy fields with blue green algae and Azolla is a potential climate change mitigation strategy due to their effect in minimizing methane emission, besides yield enhancement by nitrogen fixation.
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