Long‐term no‐till and stover retention each decrease the global warming potential of irrigated continuous corn

Over the last 50 years, the most increase in cultivated land area globally has been due to a doubling of irrigated land. Long‐term agronomic management impacts on soil organic carbon (SOC) stocks, soil greenhouse gas (GHG) emissions, and global warming potential (GWP) in irrigated systems, however,...

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Bibliographic Details
Published in:Global change biology 2017-07, Vol.23 (7), p.2848-2862
Main Authors: Jin, Virginia L., Schmer, Marty R., Stewart, Catherine E., Sindelar, Aaron J., Varvel, Gary E., Wienhold, Brian J.
Format: Article
Language:English
Subjects:
Agricultural Irrigation
Agriculture
Agronomy
Air pollution
Area
Biodiversity & Conservation
Carbon
Climate change
Climatology
Conservation
Conservation practices
conventional tillage
Corn
Cropping systems
Crops
Crops, Agricultural
Cultivated lands
Decisions
Depth
Emissions
Energy
Energy consumption
Energy management
Energy usage
Environmental Sciences & Ecology
Equivalence
Fluxes
Global Warming
global warming potential
Greenhouse Effect
greenhouse gas intensity
Greenhouse gases
History
Irrigation
Management systems
Mass
Mathematical analysis
Methane
Mitigation
Nitrous Oxide
no‐till
Organic carbon
Organic soils
Removal
Retention
Soil
Soil depth
soil organic carbon
Soils
Stocks
Stover
stover removal
Tillage
Time measurement
Weather
Yields
Zea mays
Zea mays - growth & development
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Summary:Over the last 50 years, the most increase in cultivated land area globally has been due to a doubling of irrigated land. Long‐term agronomic management impacts on soil organic carbon (SOC) stocks, soil greenhouse gas (GHG) emissions, and global warming potential (GWP) in irrigated systems, however, remain relatively unknown. Here, residue and tillage management effects were quantified by measuring soil nitrous oxide (N2O) and methane (CH4) fluxes and SOC changes (ΔSOC) at a long‐term, irrigated continuous corn (Zea mays L.) system in eastern Nebraska, United States. Management treatments began in 2002, and measured treatments included no or high stover removal (0 or 6.8 Mg DM ha−1 yr−1, respectively) under no‐till (NT) or conventional disk tillage (CT) with full irrigation (n = 4). Soil N2O and CH4 fluxes were measured for five crop‐years (2011–2015), and ΔSOC was determined on an equivalent mass basis to ~30 cm soil depth. Both area‐ and yield‐scaled soil N2O emissions were greater with stover retention compared to removal and for CT compared to NT, with no interaction between stover and tillage practices. Methane comprised
ISSN:1354-1013
1365-2486
DOI:10.1111/gcb.13637