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- W4311314440 abstract "Abstract Deep fertilization has been tested widely for nitrogen (N) use efficiency but there is little evidence of its impact on N leaching and the interplay between climate factors and crop N use. In this study, we tested the effect of three fertilizer N placements on greenhouse gas (GHG) emissions, leaching, and crop growth in a lysimeter experiment over a 33-month period comprised of three years with spring-sown cereals (S1, S2, and S3) with a preceding 11-month (F1) and a subsequent 15-month (F2) fallow period. In addition to a control with no N fertilizer (Control), 100 kg N ha − 1 year − 1 of ammonium nitrate was placed at 0.2 m (Deep), 0.07 m (Shallow), or halved between 0.07 m and 0.2 m (Mixed). Deep reduced leachate amount in each period except F1, with significant reductions (p < 0.05) in the drought year (S2) and cumulatively for S1-S3. Overall, Deep reduced water flow by 22, 25 and 34% compared to Shallow, Mixed and Control, respectively. Deep and Mixed reduced N leaching across S1-S3 compared with Shallow, but Deep further reduced N loads by 15% compared to Mixed and was significantly lowest (p < 0.05) among the fertilized treatments in S1 and S2. In S3, Deep increased grain yields by 28 and 22% compared to Shallow and Mixed, respectively, while maintaining a high grain N content and nearly doubling the agronomic efficiency of N (AE N ) and the recovery efficiency of N (RE N ). Deep N placement is a promising mitigation practice that should be further investigated." @default.
- W4311314440 created "2022-12-25" @default.
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- W4311314440 date "2022-12-13" @default.
- W4311314440 modified "2023-10-16" @default.
- W4311314440 title "Lysimeter Deep N Fertilizer Placement Reduced Leaching and Improved N Use Efficiency" @default.
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- W4311314440 doi "https://doi.org/10.21203/rs.3.rs-2361743/v1" @default.
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