Effect of dairy manure-based fertilizers on nitrous oxide emissions in a semi-arid climate

Baxter, A.E. and Leytem, A.B. (2024) Effect of dairy manure-based fertilizers on nitrous oxide emissions in a semi-arid climate. Soil Science of America Journal. 88(6):1911-2370. 25 September 2024.

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Abstract

Interest in manure treatment technologies that address challenges associated with nutrient management while minimizing environmental impacts, continues to grow. However, more research is needed to understand how manure treatment byproducts impact nutrient availability and greenhouse gas emissions (GHG). This study investigated the impact of two manure-based fertilizer sources (Dissolved Air Flotation [D] and Mechanical Vapor Recompression Solids [VR]) on N2O and CO2 emissions, soil nutrients, and crop yields in a forage rotation. The study consists of three treatments applied in plots with [M] or without [NM] previous manure application under a continuous corn (Zea mays) and triticale (x Triticosecale) rotation. Soil samples were collected, and forage yield was measured annually. Gas fluxes were measured throughout the year to determine daily and cumulative emissions. On average, M had significantly greater SOC, TC, TN, (30-37%), and reduced soil NH4-N (15%). Corn yield was 7% lower on M vs NM plots in 2021 and 17% greater on VRNM vs CNM plots in 2022. Triticale yield was 17% greater on M vs NM plots in 2021 and greatest on VR and DM plots compared to remaining NM plots in 2022. In general CO2-C and N2O emissions were greatest on M plots (27-90% and 9-287%, respectively) in 2021 and on D and VR plots in 2022 (27-70% and 434-799%, respectively). Over both years, VR lost 1.9-2.2% of N applied as N2O-N while D lost 0.4-0.8%. In semi-arid systems, DAF solids may provide a successful alternative to help reduce GHG emissions without compromising crop yield.

Item Type:	Article
NWISRL Publication Number:	1799
Subjects:	Manure Soil > Amendments Soil > Amendments > Fertilizer
Depositing User:	Users 11 not found.
Date Deposited:	08 Nov 2024 16:09
Last Modified:	08 Nov 2024 16:09
Item ID:	1841
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1841