Release of Nitrogen and CO2 Evolution from Manures and Fertilizers Applied in Soil: An Incubation Study
2022
Srinivasan, R. | Jeevan Rao, K. | Sailaja, V. | Reza, S. K.
Carbon and nitrogen mineralization and urease activity were evaluated under wet and dry climate with input of manures and fertilizers. Results indicates that release of NH4+ and NO3--N and CO2 evolution was maximum during 7 to 21 days after incubation (DAI) with recommended dose of fertilizer and decreased later on. Release of N and C took place after 21 DAI where manures applied either with neem cake or fertilizers. The evolution of CO2-C and total nitrogen were significantly higher in poultry manure combined with neem cake and FYM as compared to vermicompost along with neem cake. The NH4+-N released during the entire incubation period were higher than NO3--N. Combination of neem cake, poultry manure and FYM had higher enzyme activity than other treatments. Application of commercial fertilizers registered significantly higher CO2-C fluxes upto 35 DAI compared to manures and control. Overall effect of manures applied with neem cake or their combination proved better in the treatments for release of nitrogen. Correlation study between CO2-C flux, total N and urease activity showed that a positive relationship (p<0.05) with each others.
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