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- Title
Quantification of n<sub>2</sub>o flux density of winter rice as influenced by soil environment.
- Authors
SAHA, G.; KARMAKAR, S.; KAR, B.
- Abstract
In agricultural activities, the nitrous oxide (N2O) productions and emissions are strictly controlled by soil environment and understanding of major controlling factors for N2O releases especially from rice fields is very crucial to formulate proper strategy for future N2O emission reductions. Efforts were made to analyze the emission dynamics of N2O from rice field influenced by major soil parameters under specific management schedules. The experiment was designed with two different transplanting dates (27th June and 12th July), three nutritional practices (N as urea, N as ammonium sulphate and vermicompost) and two moisture regimes (irrigated and rainfed) with popularly grown rice variety Satabdi (IET 1444) during kharif season of 2014 and 2015 at BCKV farm , Kalyani. The N2O fluxes were measured at 10 days interval starting from 10 days after transplantation (DAT) along with simultaneous measurement of soil components. Results revealed that N2O flux density was significantly influenced by fertilizers, dates of transplanting and moisture regimes. Application of urea fertilizers along with rain-fed rice yielded maximum N2O at 40 DAT (31.68 and 32.06 mg/m2/day respectively). Peak N2O emissions were also recorded from rice transplanted on 27th June followed by 12th July. On an average maximum N2O fluxes were measured during 2015 than that of 2014 (ranged between 5.10 to 22.26 and 1.49 to 24.24 mg/m2/day respectively). Correlation studies indicated significant negative correlations among N2O fluxes and soil available nitrogen, organic carbon content, pH and EC while, soil temperature at 5 cm exerted strong positive correlation during respective phases. Linear multi-regression study suggested that these soil parameters are the main driving forces influencing N2O emission from rice.
- Subjects
SOIL density; PADDY fields; NITROGEN dioxide analysis; SOIL composition; RICE farming
- Publication
Journal of Agrometeorology, 2017, Vol 19, p308
- ISSN
0972-1665
- Publication type
Article