Plant Population and Fungicide Economically Reduced Winter Wheat Yield Gap in Kansas

Jaenisch, B. R.; Oliveira, A. C.; DeWolf, Erick; Diaz, D. A. Ruiz; Lollato, Romulo P.

doi:10.2134/agronj2018.03.0223

Cited by 54 publications

(84 citation statements)

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“…These results agree with published studies indicating that foliar fungicides are among the most important variables in intensively managed wheat systems ( Jaenisch et al, 2018). These results agree with published studies indicating that foliar fungicides are among the most important variables in intensively managed wheat systems ( Jaenisch et al, 2018).…”

Section: Potential Management Practices To Reduce Wheat Yield Gaps Insupporting

confidence: 93%

“…Still, it is characterized by wheat grain yields that are stagnant (Patrignani et al, 2014) and low (?2.5 to 3.0 Mg ha −1 ; Licker et al, 2010). However, with few exceptions (e.g., Jaenisch et al, 2018), most of the manageable agronomic practices in this region were explored in low-and average-yielding systems, ranging between 2 and 4 Mg ha −1 (Edwards et al, 2011;Schroder et al, 2011;Bushong et al, 2012;Lollato et al, 2013). However, with few exceptions (e.g., Jaenisch et al, 2018), most of the manageable agronomic practices in this region were explored in low-and average-yielding systems, ranging between 2 and 4 Mg ha −1 (Edwards et al, 2011;Schroder et al, 2011;Bushong et al, 2012;Lollato et al, 2013).…”

Section: Agronomic Practices For Reducing Wheat Yield Gaps: a Quantitmentioning

confidence: 98%

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Agronomic Practices for Reducing Wheat Yield Gaps: A Quantitative Appraisal of Progressive Producers

et al. 2019

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There is limited information on agronomic practices affecting wheat (Triticum aestivum L.) yield in intensively managed dryland systems despite the opportunity to narrow the existing yield gap (YG). We used a unique database of 100 intensively managed field‐years entered in the Kansas Wheat Yield Contest during the 2010 to 2017 harvest seasons to (i) quantify the YG, (ii) describe wheat management, and (iii) identify management opportunities and weather patterns associated with yield. We simulated wheat water‐limited yield (Yw) using Simple Simulation Modeling–Wheat (SSM‐Wheat) model for each field‐year to estimate YG as the difference between Yw and actual yield (Ya) and used 11 statistical approaches to test the association of management practices and weather variables with Ya. Wheat Ya averaged 5.5 Mg ha−1, and simulated Yw averaged 6.4 Mg ha−1, resulting in a YG of 0.9 Mg ha−1 (15% of Yw). High‐yielding fields had lower maximum and minimum temperatures and greater cumulative solar radiation and precipitation during grain fill. Varieties susceptible to fungal diseases responded to foliar fungicide (0.8–1.4 Mg ha−1), whereas resistant varieties did not. Seeding rate was negatively associated with Ya, as yield quantile 0.99 was 7.5 Mg ha−1 and decreased by 2.7 Mg ha−1 for every 100‐seed m−2 increase in seeding rate above 305 seeds m−2. In‐furrow P fertilizer, previous crop, tillage practice, and N timing were also associated with Ya. We conclude that fields entered in yield contests have closed the exploitable YG, and there are opportunities to improve Ya through improved management in regions with stagnant wheat yield.

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Section: Potential Management Practices To Reduce Wheat Yield Gaps Insupporting

confidence: 93%

Section: Agronomic Practices For Reducing Wheat Yield Gaps: a Quantitmentioning

confidence: 98%

Agronomic Practices for Reducing Wheat Yield Gaps: A Quantitative Appraisal of Progressive Producers

et al. 2019

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“…Kelley (1993) found that fungicide use resulted in higher test weight in five of seven site-years across multiple cultivars. Photosynthates are necessary to fill wheat kernels and increase test weight, and leaf area protection under the high-disease scenarios with fungicide use likely explains our results (Jaenisch et al, 2019).…”

Section: Crop Sciencementioning

confidence: 68%

“…Jaenisch et al. () did not evaluate single fungicide applications, but the authors found that fungicide applied at Feekes 6 and Feekes 10.5 to winter wheat in Kansas was economical in high‐disease site‐years and when a low‐cost fungicide product and protein premium were considered. Additionally, one and two fungicide application partial profit results in this study were similar to the nontreated control or significantly negative when disease levels were low.…”

Section: Resultsmentioning

confidence: 99%

“…Planting a resistant cultivar is an efficient way to manage fungal diseases that may occur, but wheat cultivars today can only provide protection against some specific fungal pathogens. A number of studies on winter wheat across the United States have shown that at least one properly timed foliar fungicide application can successfully defend a wheat crop from fungal diseases and protect grain yield potential (Edwards, Hunger, & Payton, ; Jaenisch, Silva, DeWolf, Ruiz‐Diaz, & Lollato, ; Kelley, ; Lopez, Rojas, & Swart, ; Ransom & McMullen, ; Thompson, Epplin, Edwards, & Hunger, ; Wegulo, Zwingman, Breathnach, & Baenziger, ; Weisz, Cowger, Ambrose, & Gardener, ). In Oklahoma, Edwards et al.…”

Section: Introductionmentioning

confidence: 99%

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Economic returns of one versus two fungicide applications in oklahoma winter wheat

2020

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Fungicides protect winter wheat (Triticum aestivum L.) yield potential by managing foliar fungal diseases, but little information comparing one vs. two applications is available for the US southern Great Plains. Field experiments conducted from 2016–2018 at two Oklahoma locations (Apache and Stillwater) used two winter wheat cultivars (‘Gallagher’ and ‘Bentley’) and four fungicide application timings (control, Feekes 6, Feekes 9, and Feekes 6 + 9). Disease levels were highest during 2017 due to leaf rust. Dry conditions during 2018 limited disease development overall. Fungicide applications resulted in significantly higher yields in three of eight year × location × cultivar comparisons, all during 2017. The Feekes 6 + 9 treatment only showed the highest grain yield for the leaf rust‐susceptible cultivar Bentley at Stillwater that season. Partial profit was also examined by year, location, and cultivar using four fungicide cost scenarios at three grain sale prices. Only 22 of 96 comparisons showed significant positive partial profit from fungicide use, and all occurred at Stillwater during 2017. Two fungicide applications had the highest profit in 4 of the 22 comparisons for the cultivar Bentley. However, a single application of a low‐cost fungicide was most often among the highest profitable fungicide treatments, depending when higher disease levels were present. Partial profits from one and two fungicide applications were not significant or significantly negative when disease levels were low. Knowledge of cultivar disease susceptibility and disease scouting need to be considered to economically justify one or two fungicide applications in Oklahoma winter wheat.

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Climate‐risk assessment for winter wheat using long‐term weather data

Lollato

Bavia²,

Perin

et al. 2020

Agronomy Journal

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Temperature and water deficit stresses cause large year-to-year yield variability, and matching crop phenology with periods less prone to stresses can improve yield stability. We used 30 years of daily weather data from 69 stations in the U.S. Great Plains to quantify the risk of water deficit and temperature stresses for winter wheat (Triticum aestivum L.) cultivars differing in maturity, and to evaluate whether the selected variables explained variability in yield and area abandonment. Crop phenology was estimated using a simple temperature-based model based on 282 field observations. A difference between the 15-d running sums of reference evapotranspiration (ET o ) and precipitation greater than 40% of the soil's available water holding capacity (AWHC) determined atmospheric water deficit (AWD). Heat and freeze stresses occurred when maximum temperatures >27 • C and minimum temperatures <0 • C occurred around heading. Probabilities of AWD in the spring was greater in the west and in the south; however, latitudinal AWD gradients dissipated when crop maturity was considered.The day of year (DOY) for last freeze increased from south to north and from east to west; and the DOY for onset of heat stress increased from south to north but did not follow a longitudinal gradient. Early maturing varieties avoided heat and AWD stresses during heading but were more likely to experience freezing conditions. Regional yield decreased and area abandonment increased with early onset of spring AWD and heat stresses. This conceptual framework for evaluating the risk of environmental stresses can be applied to other regions and cropping systems. 2132wileyonlinelibrary.com/journal/agj2 Agronomy Journal. 2020;112:2132-2151.

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Plant Population and Fungicide Economically Reduced Winter Wheat Yield Gap in Kansas

Cited by 54 publications

References 59 publications

Agronomic Practices for Reducing Wheat Yield Gaps: A Quantitative Appraisal of Progressive Producers

Agronomic Practices for Reducing Wheat Yield Gaps: A Quantitative Appraisal of Progressive Producers

Economic returns of one versus two fungicide applications in oklahoma winter wheat

Climate‐risk assessment for winter wheat using long‐term weather data

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