In-Season Application of Nitrogen and Sulfur in Winter Wheat
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Agrosystems, Geosciences & Environment,
Abstract
Decreased atmospheric S deposition in the past 20 yr has led to increased S fertilizer consumption
in winter wheat (Triticum aestivum L.). Producers often apply S without any soil test information.
Experiments were conducted at Lahoma, Lake Carl Blackwell, and Perkins, OK (2011–2013) to
assess the effect of N and S applied preplant and foliar on grain yield and grain N for winter wheat.
In 2011–2012, urea ammonium nitrate (UAN) was applied preplant at rates of 40 and 80 kg N ha-1
additionally; UAN and urea-triazone (NSURE) were foliar-applied at rates of 10 and 20 kg N ha-1.
Sulfur was foliar-applied as gypsum (CaSO4×2H2O) at 6 kg S ha-1. In 2013, trials were altered to
apply 40 kg N ha-1 as UAN preplant, and 20 kg N ha-1 foliar-applied. Gypsum rates were adjusted
at 0, 3, and 6 kg S ha-1 preplant, and S (MAX-IN-S) at 3 and 6 kg S ha-1 was foliar-applied. Sulfur
did not increase grain yield or grain N concentration at any site. The interaction between foliar S
and N and preplant S and N was not significant. Sulfur fertilizer application is less likely to benefit
this region unless low levels of soil test S are identified before planting. Use of recommended soiltesting
guides are encouraged. Although S applications are encouraged commercially, no response
was observed in these trials, and all were on sites where soil organic carbon was low (<8.5 g kg-1),
where the possibility of seeing S deficiency was greater.
Description
Keywords
Application, Nitrogen, Sulfur, Winter Wheat
Citation
Dhillon, J., Dhital, S., Lynch, T., Figueiredo, B., Omara, P., & Raun, W. R. (2019). In‐season application of nitrogen and sulfur in winter wheat. Agrosystems, Geosciences & Environment, 2(1), 1-8. doi:10.2134/age2018.10.0047