Variability in Winter Wheat (Triticum aestivum L.) Grain Yield Response to Nitrogen Fertilization in Long-Term Experiments
Loading...
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Communications in Soil Science and Plant Analysis
Abstract
Crop nitrogen (N) use is always affected by the variability in production
environment. Dataset (2001 to 2014) from long-term winter wheat (Triticum
aestivum L.) experiments at Lahoma and Stillwater, Oklahoma was used.
Both experiments have a randomized complete block design with four
replications, and fertilizer N was applied as urea pre-plant. Responsiveness
of grain yield to maximum fertilizer N rate (112 kg ha−1 – Lahoma;
135 kg ha−1 – Stillwater) was compared with that from check plot
(0 kg ha−1). The objective was to determine the relative influence of
environment, management, and variety on winter wheat grain yield. The
combined analysis of variance indicated that the main effect of year, treatment,
location, and variety accounted for 29.3%, 21.2%, 3.1%, and 22.6%,
respectively of the variance terms. Over the study period, the nonresponsiveness
of winter wheat to fertilizer N accounted for 29% and 23%
of grain yield at Lahoma and Stillwater, respectively where yield at maximum
N rate did not significantly differ from check plot. This highlights the
importance of random changes in a crop production environment and its
influence in dictating the response to applied N fertilizer. Nitrogen fertilizer
losses could be reduced by adopting in-season variable N application
techniques.
Description
Keywords
Winter wheat, Variability, Nitrogen fertilization, Grain yield response
Citation
Peter Omara, Lawrence Aula, Jagmandeep S. Dhillon, Fikayo Oyebiyi, Elizabeth M. Eickhoff, Eva Nambi, Alimamy Fornah, Jonathan Carpenter & William Raun (2020): Variability in Winter Wheat (Triticumaestivum L.) Grain Yield Response to Nitrogen Fertilization in Long-Term Experiments, Communications in Soil Science and Plant Analysis. https://doi.org/10.1080/00103624.2019.1709489