Winter Wheat Variety-Specific Response to the Combination of Nitrogen and Foliar Fungicide in 2018–2019

R P Lollato,B R Jaenisch,K Mark

doi:10.4148/2378-5977.7942

Abstract

Winter Wheat Variety-Specific Response to the Combination of Nitrogen and Foliar Fungicide in 2018–2019

Highlights

Wheat yield at the state level in Kansas has rarely surpassed 50 bushels per acre
Grain yield ranged from 18–103 bushels per acre, with greatest yields recorded in the intensive management treatment in Great Bend and the lowest yields recorded in the standard management treatment in Ashland Bottoms
While we did not investigate the net profits from the intensive management, these results suggest that intensifying management on wheat could add income from additional yield produced and protein premiums, as long as these are available

Summary

Introduction

Wheat yield at the state level in Kansas has rarely surpassed 50 bushels per acre. recent evidence suggests that the long-term dryland potential yield is about 77 bushels per acre (Lollato and Edwards, 2015; Lollato et al, 2017). Recent analyses of factors contributing to yield gaps in Kansas suggested that both nitrogen management and foliar fungicides are among the most important factors contributing to the regional yield gaps (de Oliveira Silva et al, 2020a; Jaenisch et al, 2019; Lollato et al, 2019a). Jaenisch et al (2019) showed that foliar fungicides could contribute as much as 15–20 bushels per acre yield to differences for a variety with high susceptibility to stripe rust in a season when stripe rust is prevalent. De Oliveira Silva et al (2020a) later suggested that, while the 15 bushels per acre yield difference between fungicide versus non-fungicide was possible, it depended on the variety’s susceptibility to major diseases such as leaf rust and stripe rust

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Conclusion