• C.RAVIKUMAR
• M.GANAPATHY

Field experiments were conducted to study the effect of combined use of organic manures and inorganic fertilizers on carbon dioxide fluxes and yield of sunflower production during the year 2016 and 2017. 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 + SSP @ 40 kg ha-1, T4 - Vermicompost @ 5 t ha-1 + 100% RDF + SSP @ 40 kg ha-1, T5 - Pressmud @ 5 t ha-1 + 100% RDF + SSP @ 40 kg ha-1, T6 - Poultry waste manure @ 5 t ha-1 + 100% RDF + SSP @ 40 kg ha-1 , T7- Composted coir pith @ 5 t ha-1 + 100% RDF + SSP @ 40 kg ha-1. The results recorded that the application of 100% RDF alone or different organics integrates with 100% RDF treatments significantly influenced the seed and stover yield during the year 2016 and 2017. The higher seed yield of 2218 and 2295 kg ha-1 and stover yield of 2894 and 2942 kg ha-1 were recorded in the treatment supplemented with Farmyard manure @ 12.5 t ha-1 + 100 % RDF + SSP @ 40 kg ha-1 + Azospirillum and phosphobacteria as soil application (T3) during the year 2016 and 2017 respectively. Pertaining to the soil organic carbon of 8.10 and 8.26 g kg-1, soil organic matter content of 1.39 and 1.40 %, a higher total carbon of 13.87 and 14.21 g kg-1 and carbon stock of 15.43 and 15.96 t ha-1 recorded in the treatment supplemented with Farmyard manure @ 12.5 t ha-1 + 100 % RDF + SSP @ 40 kg ha-1 + Azospirillum and Phosphobacteria (T3) during the year 2016 and 2017 respectively and the same was superior over all other treatments. With regards to CO2 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 CO2 emission was noticed from vegetative to reproductive stage and there after CO2 emission declined at harvest stage of the crop during the first and second year of the crop. FYM @ 12.5 t ha-1 + 100 RDF% + SSP @ 40 kg ha-1 + Azospirillum and phosphobacteria (T3) recorded the least value of 0.08 and 0.07, 0.14 and 0.14 and 0.11 and 0.07 m mol m-2 s-1 at 40, 80 DAS and at harvest stages respectively during both the years 2016 and 2017 respectively. Apparently a higher value of CO2 emission of 0.13 and 0.13, 0.17 and 0.21 and 0.16 and 0.13 m mol m-2 s-1 were recorded with the treatment supplemented with pressmud @ 5 t ha-1 + 100 RDF% + SSP @ 40 kg ha-1 + Azospirillum and phosphobacteria as soil application at 40, 80 DAS and at harvest respectively during the year 2016 and 2017 respectively.

Inorganic fertilizers, Organic manure, SOC, soil organic matter, sunflower and Total carbon

"EFFECT OF COMBINED USE OF ORGANIC MANURES AND INORGANIC FERTILIZERS ON THE CARBON DIOXIDE FLUXES IN SUNFLOWER (Helianthus annuus L.) ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.224-235, November-2018, Available :http://www.jetir.org/papers/JETIR1811B38.pdf

"EFFECT OF COMBINED USE OF ORGANIC MANURES AND INORGANIC FERTILIZERS ON THE CARBON DIOXIDE FLUXES IN SUNFLOWER (Helianthus annuus L.) ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp224-235, November-2018, Available at : http://www.jetir.org/papers/JETIR1811B38.pdf