Omara, PeterAula, LawrenceOyebiyi, FikayoNambi, EvaDhillon, Jagmandeep S.Carpenter, JonathanRaun, William R2022-12-122022-12-122019Peter Omara, Lawrence Aula, Fikayo Oyebiyi, Eva Nambi, Jagmandeep S. Dhillon, Jonathan Carpenter & William R Raun (2019): No-tillage Improves Winter Wheat (Triticum Aestivum L.) Grain Nitrogen Use Efficiency, Communications in Soil Science and Plant Analysis, DOI: 10.1080/00103624.2019.1659307https://doi.org/10.1080/00103624.2019.1659307https://nru.uncst.go.ug/handle/123456789/6220Tillage practices are among the factors that affect soil quality as well as use efficiency of fertilizer nitrogen (N). Data consisting of 24-site-years from two long-term experiments 222 (E222) located in Stillwater and 502 (E502) located in Lahoma, Oklahoma were used in this study. Treatments included pre-plant N rates of 0, 45, 90, and 135 kg N ha−1 at E222 and 0, 22.5, 45, 67, 90 and 112 kg N ha−1 at E502. The objective was to evaluate the influence of no-tillage (NT) on grain N uptake and N use efficiency (NUE) of winter wheat (Triticum aestivum L.) relative to conventional tillage (CT). Generally, results indicated significantly higher grain N uptake and NUE under NT relative to CT. However, single-degree-of-freedom contrast at individual N rate indicated inconsistency in grain N uptake and NUE between experimental locations. Under both tillage practices, grain N uptake increased with N rate while NUE decreased as N rate increased. Overall, NUE and grain N uptake was 23% and 7.5% higher under NT compared to CT, respectively. Therefore, winter wheat farmers in the United States Central Great Plains currently practicing CT could improve the efficiency of the surface-applied fertilizer N and farm profitability by adopting NT.enNo-tillageNitrogen use efficiencyGrain N uptakeNitrogenWinter wheatArticle