No-tillage Improves Winter Wheat (Triticum Aestivum L.) Grain Nitrogen Use Efficiency
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Communications in Soil Science and Plant Analysis,
Abstract
Tillage 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.
Description
Keywords
No-tillage, Nitrogen use efficiency, Grain N uptake, Nitrogen, Winter wheat
Citation
Peter 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: 10.1080/00103624.2019.1659307