Effects of biochar and N-stabilizers on greenhouse gas emissions from a subtropical pasture field applied with organic and inorganic nitrogen fertilizers. (15th March 2022)

• Record Type: Journal Article
• Authors: Mikhael, Joseph Elias Rodrigues; Wang, Jim J.; Dodla, Syam; Scaglia, Guillermo; Dattamudi, Sanku
• Is Part Of: Journal of environmental management. Volume 306(2022)
• Publication Date: 2022-03-15
• Subjects: Greenhouse gas emissions -- Pastures -- N-fertilizers -- N-stabilizers -- Biochar; BC pine hardwood biochar -- CT control -- DCD dicyandiamide -- GHG greenhouse gas -- MA manure -- MB manure + pine hardwood biochar -- MS manure + N-stabilizer -- NBPT N-(n-butyl) thiophosphoric triamide -- NS N-stabilizer NBPT + DCD -- SOM soil organic matter -- UB urea + pine hardwood biochar -- UR urea -- US urea + N-stabilizer; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.114423
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Pasturelands contribute significantly to the global CO2, CH4 and N2 O emissions. These gas emissions are influenced by the amount and type of N-fertilizers applied and local climate. Recent studies showed potential of biochar and N-stabilizer compounds in minimizing CO2, CH4 and N2 O emissions by regulating N-release from N-fertilizers. The present study was aimed at determining and comparing the effects of biochar and N-(n-butyl) thiophosphoric triamide + dicyandiamide (N-stabilizer) on CO2, N2 O and CH4 emissions from a pasture fertilized with cattle manure or urea. The study was conducted during 2015 and 2016 in an established bermudagrass ( Cynodon dactylon L. Pers.). Treatments consisted of combination of N-sources (manure, and urea) and two mitigation technologies [pine hardwood biochar (BC) and N-stabilizer] along with control. Emissions of GHGs were measured from each plot using static chamber systems. Both BC and N-stabilizer applications with manure applied to the hay field significantly decreased N2 O emissions by 42% and 45%, respectively, in the year-2, and emission factors compared to manure only treatment. Addition of N-stabilizer to urea had significantly decreased N2 O emissions compared to urea alone, while BC had statistically insignificant effect although numerically lowered N2 O emissions in both the years. Application of manure to the soil resulted in significantly higher CO2 emissions in both years and CH4 emissions in 2016 compared to unfertilized soil. Urea application had significant effect on CO2 emissions in 2016, while no effect on CH4 emissions compared to control. Application of either biochar or N-stabilizer did not significantly affect CO2 and CH4 emissions. Highlights: N-stabilizer decreased N2 O emissions from urea and manure applied to pastures. Biochar was effective to decrease N2 O emissions from manure, but not from urea. Both N-stabilizer and pine hardwood biochar were not effective to decrease CO2 and CH4 emissions.