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- W2007509242 abstract "Precision‐guided technologies enable corn ( Zea mays L.) growers to apply pre‐plant anhydrous ammonia (NH 3 ) parallel to intended corn rows even when full‐width tillage follows NH 3 application. Close, but crop‐safe, proximity of NH 3 to corn rows may potentially increase N use efficiency and lower N requirements and nitrous oxide (N 2 O) emissions. Experiments in 2011 and 2012 on silty clay loam Mollisol near West Lafayette, IN, assessed area‐ and yield‐scaled N 2 O emissions when spring pre‐plant NH 3 was applied at recommended (202 kg N ha −1 ) and reduced rate (145 kg N ha −1 ), in no‐till (NT) and conventional tillage (CT) systems following NT soybean [ Glycine max (L.) Merr.]. Each 12‐cm deep NH 3 band was positioned 15 cm from, and parallel to, intended corn rows using precision guidance. Nitrification of NH 3 in application bands was 31% faster under CT than NT. Area‐ and grain yield‐scaled N 2 O emissions were N rate dependent in both growing seasons. On average, CT+202 kg N resulted in highest area‐scaled (mean = 2.45 kg N ha −1 ) and grain yield‐scaled (mean = 360 g N Mg −1 ) N 2 O emissions. In contrast, CT+145 kg N had similar yield‐scaled emissions as NT+202 and NT+145 kg N, and reduced area‐scaled N 2 O emissions by 65, 45, and 19% respectively, relative to CT+202 kg N, NT+202 kg N, and NT+145 kg N treatments. These preliminary results suggest that reducing pre‐plant NH 3 rates by ∼30% under CT has the potential to reduce N 2 O emissions without significant yield declines in the CT phase of a NT–CT rotation, despite faster nitrification in CT." @default.
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- W2007509242 date "2015-03-01" @default.
- W2007509242 modified "2023-09-26" @default.
- W2007509242 title "Tillage and Nitrogen Rate Effects on Area‐ and Yield‐Scaled Nitrous Oxide Emissions from Pre‐Plant Anhydrous Ammonia" @default.
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- W2007509242 doi "https://doi.org/10.2134/agronj14.0440" @default.
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