• C.RAVIKUMAR
• M.GANAPATHY

Field experiments were conducted to study the effect of combined use of organic manures and inorganic fertilizers on methane fluxes and yield of rice crop production during the year 2015 and 2016. The experiments were conducted in RBD with the following treatments viz., T1- Control (No fertilizer), T2- RDF alone, T3 - Farmyard manure @ 12.5 t ha-1 + 100 % RDF ha-1, T4 - Vermicompost @ 5 t ha-1 + 100% RDF ha-1, T5 - Pressmud @ 5 t ha-1 + 100% RDF ha-1, T6 - Poultry Manure @ 5 t ha-1 + 100% RDF ha-1 , T7- Composted coir pith @ 5 t ha-1 + 100% RDF ha-1. The results revealed that application of 100% RDF alone and integration of different organic manures with 100% RDF treatments significantly influenced the grain and straw yield of the rice during the Thaladi season of 2015 and 2016. The higher grain yield of 8819 and 9235 kg ha-1 and straw yield of 8775 and 9055 kg ha-1 were recorded in the treatment supplemented with Farmyard manure @ 12.5 t ha-1 + 100 % RDF ha-1 (T3) during the Thaladi season for the year 2015 and 2016 respectively. Pertaining to the various carbon forms, the higher total carbon of 12.83 and 13.28 g kg-1, Soil organic carbon of 7.8 and 8.6 g kg-1 and carbon stock of 13.98 and 15.80 t ha-1 were recorded in the treatment supplemented with Farmyard manure @ 12.5 t ha-1 + 100 % RDF ha-1 (T3) during the Thaladi season for the year 2015 and 2016 respectively and the same was superior over all other treatments. With regards to CH4 emission pattern, the combined application of organic manures and inorganic fertilizers recorded a higher value over control (No fertilizer) and 100% RDF alone applied treatments. A consistent increased pattern of CH4 emission was noticed from vegetative to reproductive stage and there after CH4 emission declined at harvest stage of the crop, during the Thaladi season of the first and second year of the crop. Farmyard manure @ 12.5 t ha-1 + 100 % RDF ha-1 (T3) recorded the least value of CH4 emission at 40, 80 DAS and at harvest 6.46 and 7.01, 9.14 and 9.34 and 4.29 and 4.98 mg m-2 h-1 respectively for both the years. Apparently a higher value of CH4 emission of 7.42 and 7.69, 10.19 and 10.10 and 5.80 and 5.28 mg m-2 h-1 were recorded with the treatment nurtured with pressmud @ 5 t ha-1 + 100% RDF (T5) at 40, 80 DAS and at harvest respectively during the Thaladi season for the year 2015 and 2016.

Key words: Organic manure, Inorganic fertilizers, rice yield, CH4, SOM, Soil organic carbon.

"EFFECT OF COMBINED USE OF ORGANIC MANURES AND INORGANIC FERTILIZERS ON THE METHANE FLUXES IN RICE CROP (Oryza sativa). ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.555-570, November-2018, Available :http://www.jetir.org/papers/JETIR1811881.pdf

"EFFECT OF COMBINED USE OF ORGANIC MANURES AND INORGANIC FERTILIZERS ON THE METHANE FLUXES IN RICE CROP (Oryza sativa). ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp555-570, November-2018, Available at : http://www.jetir.org/papers/JETIR1811881.pdf