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Deep N fertilizer placement mitigated N2O emissions in a Swedish field trial with cereals
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Deep N fertilizer placement mitigated N2O emissions in a Swedish field trial with cereals
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Journal Article
Deep N fertilizer placement mitigated N2O emissions in a Swedish field trial with cereals
2020
Overview
Deep fertilizer placement is a proposed strategy to increase crop yield and nitrogen (N) use efficiency while decreasing nitrous oxide (N
2
O) emissions from soil to atmosphere. Our objective was to test three fertilization depth orientations to compare overall N use efficiency, based on a 2-year field trial on a mineral soil cropped with cereals in Uppsala, Sweden. The field was fertilized with ammonium nitrate at a rate of 120 kg ha
−1
(2016) and 105 kg ha
−1
(2017) and a deep fertilizer placement (DP) at 0.20 m was compared to a shallow placement (SP) at 0.07 m and a mixed-depth placement (MP) where fertilizer was halved between the depths of 0.07 and 0.20 m, and a non-fertilized control (NF). In 2016, compared to SP, MP and DP increased N content in harvested grain by 3.6% and 2.5% respectively, and DP increased grain yield by 11% (
P
< 0.05). In both years, N
2
O emissions were similar in DP and NF, whereas SP and MP emissions were similar but generally higher than those in DP and NF. Fertilizer-induced emission factors (EF) for the growing season of 2017 decreased with fertilizer placement depth and were 0.77 ± 0.07, 0.58 ± 0.03, and 0.10 ± 0.02 for SP, MP, and DP, repectively. Although deep N placement benefits are likely dependent on weather conditions and soil type, this strategy has a clear potential for mitigating N
2
O emissions without adversely affecting yield.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
/ Ammonium
/ Biomedical and Life Sciences
/ Cereals
/ Grain
/ Nitrogen
/ soil-atmosphere interactions
/ Soils
/ Sweden
/ Weather
