Soil Carbon and Nitrogen Dynamics Following Application of Pig Slurry for the 19th Consecutive Year II. Nitrous Oxide Fluxes and Mineral Nitrogen

P. Rochette¹, E. van Bochove¹, D. Prévost¹, D. A. Angers¹, D. Côté² and N. Bertrand¹

Abstract
Agricultural soils often receive annual applications of manure for long periods. Our objective was to quantify the effects of 19 consecutive years of pig (Sus scrofa) slurry (PS) application to a loamy soil (loamy, mixed, frigid Aeric Haplaquept) on N₂O emissions. Soil surface N₂O fluxes (FN₂O) were measured 36 times in 1 yr. Nitrous oxide concentration profiles, soil NH_4⁺- and NO₃^--N contents, denitrifying enzyme activity (DEA), and denitrification rate (DR) in soil were also determined to explain the variation in FN₂O.

Long-term (19 yr) treatments on continuous silage maize (Zea mays L.) were 60 (PS60) and 120 Mg ha^-1 yr-^-1 (PS120) of pig slurry and a control receiving mineral fertilizer at a dose of 150 kg ha^-1 each of N, P₂O₅, and K₂O. Denitrifying enzyme activity, soil N₂O concentrations, and FN2O (<25 ng m^-2 s^-1) were low in the control plots receiving mineral fertilizer.

Annual applications of PS to the soil for 18 yr had positive residual effects on the DEA compared with the long-term fertilized control plots. Following PS application, there was a strong and rapid increase of FN₂O (up to 350 ng m^-2 s^-1) on manured plots. The PS-induced FN₂O increased with increasing quantity of PS, probably as the result of a greater availability of NO₃^--N for denitrification. The effects of PS on FN₂O were mostly limited to the 30 d following application, with low fluxes (<10 ng m^-2 s^-1) during the rest of the measurement period. Total N₂O–N emissions represented 0.62, 1.23, and 1.65% of total N applied in control, PS60, and PS120 plots, respectively. These emission factors for the PS plots agreed with values previously suggested for N-fertilized soils (1.25%).

Source
Soil Science Society of America Journal (2000) 64: 1396-1403

Author Locations & Affiliations
(1) Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada, G1V 2J3
(2) Institut de recherche et de développement en agroenvironnement, Complexe Scientifique, 2700 Einstein St., Sainte-Foy, QC, Canada, G1P 3W8

Posted April 2010


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Research Extension Courses Consumers -------------------------- Virtual Tours Student & Job Opportunities News Articles Standards -------------------------- Market Information Events Issues Animal Welfare Strategic Plans -------------------------- Links Award-winners Site Map	Soil Carbon and Nitrogen Dynamics Following Application of Pig Slurry for the 19th Consecutive Year II. Nitrous Oxide Fluxes and Mineral Nitrogen P. Rochette¹, E. van Bochove¹, D. Prévost¹, D. A. Angers¹, D. Côté² and N. Bertrand¹ *Abstract* Agricultural soils often receive annual applications of manure for long periods. Our objective was to quantify the effects of 19 consecutive years of pig (Sus scrofa) slurry (PS) application to a loamy soil (loamy, mixed, frigid Aeric Haplaquept) on N₂O emissions. Soil surface N₂O fluxes (FN₂O) were measured 36 times in 1 yr. Nitrous oxide concentration profiles, soil NH_4⁺- and NO₃^--N contents, denitrifying enzyme activity (DEA), and denitrification rate (DR) in soil were also determined to explain the variation in FN₂O. Long-term (19 yr) treatments on continuous silage maize (Zea mays L.) were 60 (PS60) and 120 Mg ha^-1 yr-^-1 (PS120) of pig slurry and a control receiving mineral fertilizer at a dose of 150 kg ha^-1 each of N, P₂O₅, and K₂O. Denitrifying enzyme activity, soil N₂O concentrations, and FN2O (<25 ng m^-2 s^-1) were low in the control plots receiving mineral fertilizer. Annual applications of PS to the soil for 18 yr had positive residual effects on the DEA compared with the long-term fertilized control plots. Following PS application, there was a strong and rapid increase of FN₂O (up to 350 ng m^-2 s^-1) on manured plots. The PS-induced FN₂O increased with increasing quantity of PS, probably as the result of a greater availability of NO₃^--N for denitrification. The effects of PS on FN₂O were mostly limited to the 30 d following application, with low fluxes (<10 ng m^-2 s^-1) during the rest of the measurement period. Total N₂O–N emissions represented 0.62, 1.23, and 1.65% of total N applied in control, PS60, and PS120 plots, respectively. These emission factors for the PS plots agreed with values previously suggested for N-fertilized soils (1.25%). *Source* Soil Science Society of America Journal (2000) 64: 1396-1403 *Author Locations & Affiliations* (1) Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada, G1V 2J3 (2) Institut de recherche et de développement en agroenvironnement, Complexe Scientifique, 2700 Einstein St., Sainte-Foy, QC, Canada, G1P 3W8 Posted April 2010
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Soil Carbon and Nitrogen Dynamics Following Application of Pig Slurry for the 19th Consecutive Year II. Nitrous Oxide Fluxes and Mineral Nitrogen

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