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  1. Article: How can we estimate optimum fertilizer rates with accuracy and precision?

    Miguez, Fernando E. / Poffenbarger, Hanna

    Agricultural & environmental letters. 2022, v. 7, no. 1

    2022  

    Abstract: For decades, agronomists have invested time and resources to identify the optimum nitrogen (N) rates for cereal crops. The most common method for estimating the agronomic optimum N rate (AONR) is to design a field experiment with several N fertilizer ... ...

    Abstract For decades, agronomists have invested time and resources to identify the optimum nitrogen (N) rates for cereal crops. The most common method for estimating the agronomic optimum N rate (AONR) is to design a field experiment with several N fertilizer rates and fit a regression model to the yield observations. Here, we concentrate on its accuracy and precision given choices of experimental design and statistical analysis. Our first finding is that the choice of functional form has a large agronomic effect on the estimate of the AONR, and this depends on the data‐generating model. Our second finding is that improving the precision and accuracy of AONR estimates will demand an increase in the number of N rates and replications. Finally, we propose that using either the best‐fitting model or a weighted model is preferable to always choosing either the linear‐plateau (negative bias) or quadratic‐plateau (positive bias) models.
    Keywords experimental design ; field experimentation ; models ; nitrogen ; nitrogen fertilizers ; regression analysis
    Language English
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ISSN 2471-9625
    DOI 10.1002/ael2.20075
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Effects of silicon supplementation on growth and silicon accumulation in tall fescue (Festuca arundinacea) and bentgrass (Agrostis stolonifera)

    Qian, Sara / Poffenbarger, Hanna / Unrine, Jason M.

    Journal of Plant Nutrition. 2023 Aug. 27, v. 46, no. 14 p.3535-3546

    2023  

    Abstract: Previous studies of the benefits of silicon (Si) supplementation in turfgrass have had inconsistent results. This study assessed the effect of Si supplementation on biomass production and Si accumulation of tall fescue (Festuca arundinacea) and bentgrass ...

    Abstract Previous studies of the benefits of silicon (Si) supplementation in turfgrass have had inconsistent results. This study assessed the effect of Si supplementation on biomass production and Si accumulation of tall fescue (Festuca arundinacea) and bentgrass (Agrostis stolonifera). Plants were grown in buffered Hoagland’s media (pH 6) with four sodium silicate (Na₂SiO₄) treatments (0, 0.5, 1, 2, and 4 mM Si). The two species responded differently to Si supplementation in terms of biomass. For bentgrass, biomass was enhanced by Si supplementation, but only significantly (p < 0.05) at the highest concentration (4 mM Si). Lower Si concentrations (0.5, 1, and 2 mM Si) significantly increased biomass in tall fescue compared to control, but there was no increase in biomass at 4 mM Si. There was a positive linear relationship between Si concentrations in media and Si concentrations in tissue. At 4 mM Si, the Si concentrations in aboveground tissue of tall fescue and bentgrass averaged 24 and 30.5 g kg⁻¹ dry mass, respectively. Elevated Si concentrations in growth media promoted formation of silica bodies. The highest Si rates (4 mM Si) resulted in the highest silica body areal coverage in leaves of both species. We observed two silica body morphologies (which we termed long and barbed). Our findings indicate that tall fescue is likely to benefit from Si supplementation when soil pore water dissolved Si is below 0.5 mM, but increases in soil pore water dissolved Si above 2 mM are unlikely to increase biomass. In contrast, benefits in bentgrass may only be realized if dissolved Si in pore water is increased to 4 mM.
    Keywords Agrostis stolonifera ; Festuca arundinacea ; biomass production ; pH ; plant nutrition ; silica ; silicon ; sodium silicate ; soil pore water ; turf grasses ; Hydroponics ; silica body ; turfgrass
    Language English
    Dates of publication 2023-0827
    Size p. 3535-3546.
    Publishing place Taylor & Francis
    Document type Article ; Online
    ZDB-ID 446190-3
    ISSN 1532-4087 ; 0190-4167
    ISSN (online) 1532-4087
    ISSN 0190-4167
    DOI 10.1080/01904167.2023.2206435
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  3. Article ; Online: Corn optimum nitrogen fertilizer rate and application timing when following a rye cover crop

    Quinn, Daniel J. / Poffenbarger, Hanna J. / Miguez, Fernando E. / Lee, Chad D.

    Field Crops Research. 2023 Feb., v. 291 p.108794-

    2023  

    Abstract: Farmers and researchers continue to question the impact of rye (Secale cereale L.) cover crops (RCC) on the optimal N fertilizer rate and grain yield of corn (Zea mays L.). In addition, minimal research has addressed the role of N fertilizer timing on ... ...

    Abstract Farmers and researchers continue to question the impact of rye (Secale cereale L.) cover crops (RCC) on the optimal N fertilizer rate and grain yield of corn (Zea mays L.). In addition, minimal research has addressed the role of N fertilizer timing on reducing corn N stress and yield loss following a RCC. In this research, our objectives were to evaluate corn N fertilizer requirement following a RCC and different N fertilizer timings. Trials were established at three locations (2017-20) to evaluate corn response to N fertilizer rate (0 - 303 kg N ha⁻¹) following a RCC and no RCC with preplant and split-applied N fertilizer. A lower plant-available N supply, indicated by lower soil inorganic N and corn chlorophyll content, as well as a reduced plant stand were observed following a RCC. A RCC reduced corn grain yield by 20% at the 0 kg N ha⁻¹ due to apparent N deficiency, but did not reduce corn yield at the agronomic optimum N rate (AONR) or the economic optimum N rate (EONR). The AONR and EONR were statistically similar regardless of RCC presence and N application timing. However, corn chlorophyll content, agronomic efficiency, and yield was increased following a split N application. In addition, a quadratic-plateau regression analysis indicated greater yield increase per unit N applied for a split application than a preplant application. Our results suggest that farmers in similar production environments may benefit from a split N application to improve corn N use efficiency and yield regardless of the presence of a RCC. However, split application may be appealing following a RCC, where lower plant-available N supply requires more efficient fertilizer delivery to limit a higher N fertilizer rate.
    Keywords Secale cereale ; Zea mays ; chlorophyll ; corn ; cover crops ; fertilizer rates ; grain yield ; nitrogen fertilizers ; nutrient use efficiency ; regression analysis ; research ; rye ; soil ; split application ; AONR ; C ; EONR ; N ; QP ; RCC ; SOM ; UAN ; YAONR ; Maize ; Nitrogen ; Cover crop ; Agronomy
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 435684-6
    ISSN 1872-6852 ; 0378-4290
    ISSN (online) 1872-6852
    ISSN 0378-4290
    DOI 10.1016/j.fcr.2022.108794
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  4. Article ; Online: Litter quality and living roots affected the formation of new mineral-associated organic carbon but did not affect total mineral-associated organic carbon in a short-term incubation

    Canisares, Lucas P. / Banet, Travis / Rinehart, Brian / McNear, David / Poffenbarger, Hanna

    Geoderma. 2023 Feb., v. 430 p.116302-

    2023  

    Abstract: Storing carbon (C) in soil organic matter (SOM) is critical for mitigating climate change as well as for providing food security under extreme weather events. Mineral-associated organic matter (MAOM), which is the organic matter attached to silt and clay, ...

    Abstract Storing carbon (C) in soil organic matter (SOM) is critical for mitigating climate change as well as for providing food security under extreme weather events. Mineral-associated organic matter (MAOM), which is the organic matter attached to silt and clay, has a longer residence time than the light, sand-sized particulate organic matter (POM). Hence, increasing the C in this fraction is thought to be important for long-term C storage. However, the influence of litter quality and living plants on new MAOM formation and MAOM turnover is unclear. We hypothesized that lower C:N litter would form MAOM more efficiently and result in more MOAM than higher C:N litter because lower C:N litter favors biomass production of microbes, which are thought to be an important precursor of MAOM. In addition, we hypothesized that living plants would amplify the effect of litter quality on MAOM formation and turnover because roots growing with low C:N litter would be less N-stressed and rely less on MAOM turnover to access N than roots growing in high C:N litter. We conducted a greenhouse study where soil was mixed with four different plant litter treatments: a control without litter, soybean (Glycine max) with C:N = 21, buckwheat (Fagopyrum esculentum) with C:N = 35, and sudex (Sorghum bicolor [L.] Moench × S. sudanense [P.] Staph.) with C:N = 65. The four litter treatments were incubated with and without living oats (Avena sativa). The incubation was maintained for 40 days, and over this period soybean and buckwheat lost 89 % of their initial dry matter while sudex lost 69 % of its initial dry matter. Contrary to our expectation, the litter with the higher C:N (sudex) had the greatest proportion of degraded C transferred to MAOM (i.e., the litter MAOM-C transfer efficiency). However, the litter MAOM-C transfer efficiency was not associated with the total MAOM-C at the end of the incubation. The presence of living plants increased the amount of MAOM-C derived from soybean and sudex litter, but it did not increase the total MAOM-C. Thus, our results demonstrate that high C:N litter can efficiently form new MAOM-C, which can be enhanced by the presence of living plants, but the greater MAOM-C formation may be accompanied by a loss of pre-existing MAOM-C.
    Keywords Avena sativa ; Fagopyrum esculentum ; Glycine max ; Sorghum bicolor ; biomass production ; buckwheat ; carbon sequestration ; clay ; climate change ; food security ; greenhouse experimentation ; organic carbon ; particulate organic matter ; plant litter ; soil organic matter ; soybeans ; weather ; Mineral-associated organic matter ; Carbon transfer efficiency
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 281080-3
    ISSN 1872-6259 ; 0016-7061
    ISSN (online) 1872-6259
    ISSN 0016-7061
    DOI 10.1016/j.geoderma.2022.116302
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  5. Article ; Online: Contributions of plant breeding to soil carbon storage: Retrospect and prospects

    Poffenbarger, Hanna / Castellano, Michael / Egli, Dennis / Jaconi, Angelica / Moore, Virginia

    Crop Science. 2023 , v. 63, no. 3 p.990-1018

    2023  

    Abstract: There is interest in harnessing cropland C storage potential at a large scale to mitigate climate change and improve land productivity. While the effects of soil management practices on C storage have been studied extensively, opportunities to select for ...

    Abstract There is interest in harnessing cropland C storage potential at a large scale to mitigate climate change and improve land productivity. While the effects of soil management practices on C storage have been studied extensively, opportunities to select for C sequestration traits in crop plants remain largely unexplored. This review describes how genetic improvement of major US crops may have altered soil C stocks historically and identifies potential opportunities for plant breeding to increase cropland C stocks. Through quantitative literature review, we find that breeding has led to an increase in aboveground residue C inputs to the soil for corn (Zea mays L.) and soybeans (Glycine max (L.) Merr) and a decrease in aboveground residue C inputs for wheat (Triticum aestivum L. and Triticum turgidum L.). Breeding has largely not altered the root:shoot ratio of these crops. Given that there is limited potential for further major improvements in harvest index, breeding for high grain yields may necessitate increasing aboveground biomass and residue production in the future. Crop root traits and residue quality may influence the stabilization of crop‐derived C in soil, but there is uncertainty regarding historical changes in these traits due to breeding, the magnitude of their effect on soil organic C stocks, and tradeoffs or synergies with breeding for high yield. Nevertheless, root traits such as suberin content, rhizodeposition, mycorrhizal association, and depth emerge as potential targets for more efficient C stabilization. There is also a large opportunity for plant breeding to enhance the performance of cover crops, double crops, perennial grains, and perennial groundcovers, which can increase annual C inputs to the soil by occupying fallow periods. Our review reveals that there are many opportunities for plant genetic improvement to fix more C in cropping systems and enhance its stabilization in the soil to meet the goals of sustainable intensification and cropland C capture.
    Keywords Glycine max ; Triticum aestivum ; Triticum turgidum ; Zea mays ; aboveground biomass ; carbon sequestration ; climate change ; corn ; cropland ; genetic improvement ; harvest index ; land productivity ; rhizodeposition ; root shoot ratio ; soil ; soil management ; soil organic carbon ; suberin ; uncertainty ; wheat
    Language English
    Dates of publication 2023-05
    Size p. 990-1018.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 410209-5
    ISSN 0011-183X
    ISSN 0011-183X
    DOI 10.1002/csc2.20920
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  6. Article ; Online: Chemical differences in cover crop residue quality are maintained through litter decay.

    Thapa, Resham / Cabrera, Miguel / Schomberg, Harry H / Reberg-Horton, Chris / Poffenbarger, Hanna / Mirsky, Steven B

    PloS one

    2023  Volume 18, Issue 7, Page(s) e0289352

    Abstract: As plant litter decomposes, its mass exponentially decreases until it reaches a non-zero asymptote. However, decomposition rates vary considerably among litter types as a function of their overall quality (i.e., carbon:nitrogen (C:N) ratio and litter ... ...

    Abstract As plant litter decomposes, its mass exponentially decreases until it reaches a non-zero asymptote. However, decomposition rates vary considerably among litter types as a function of their overall quality (i.e., carbon:nitrogen (C:N) ratio and litter chemistry). We investigated the effects of hairy vetch (HV: Vicia villosa Roth):cereal rye (RYE: Secale cereale L.) biomass proportions with or without broadcasted poultry manure on overall litter quality before and during decomposition. As HV biomass proportions increased from 0 to 100%, the relative susceptibility of HV:RYE mixtures to microbial decomposition increased due to: (i) decrease in the initial C:N ratio (87:1 to 10:1 in 2012 and 67:1 to 9:1 in 2013), (ii) increase in the non-structural labile carbohydrates (33 to 61% across years), and (iii) decrease in the structural holo-cellulose (59 to 33% across years) and lignin (8 to 6% across years) fractions. Broadcasted poultry manure decreased the overall initial quality of HV-dominated litters and increased the overall initial quality of RYE-dominated litters. Across all HV:RYE biomass proportions with or without poultry manure, chemical changes during litter decay were related to proportional mass loss. Therefore, the relative decrease in carbohydrates and the concomitant increase in holo-cellulose and lignin fractions were more pronounced for fast decomposing litter types, i.e., litters dominated by HV rather than RYE. While our results suggest possible convergence of litter C:N ratios, initial differences in litter chemistry neither converged nor diverged. Therefore, we conclude that the initial chemistry of litter before decomposition exerts a strong control on its chemical composition throughout the decay continuum.
    MeSH term(s) Lignin/analysis ; Manure/analysis ; Biomass ; Nitrogen/analysis ; Carbon/analysis ; Cellulose/analysis ; Vicia ; Edible Grain/chemistry ; Soil ; Plant Leaves/chemistry
    Chemical Substances Lignin (9005-53-2) ; Manure ; Nitrogen (N762921K75) ; Carbon (7440-44-0) ; Cellulose (9004-34-6) ; Soil
    Language English
    Publishing date 2023-07-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0289352
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Weather-dependent relationships between topographic variables and yield of maize and soybean

    Leuthold, Sam J. / Wendroth, Ole / Salmerón, Montserrat / Poffenbarger, Hanna

    Field crops research. 2022 Feb. 01, v. 276

    2022  

    Abstract: Weather and topography are two important drivers of spatial variability in crop yield, but interactions between these two factors remain poorly understood. To elucidate how spatial yield variability shifts in response to precipitation, we collected data ... ...

    Abstract Weather and topography are two important drivers of spatial variability in crop yield, but interactions between these two factors remain poorly understood. To elucidate how spatial yield variability shifts in response to precipitation, we collected data from published literature that examined the yield response of maize (Zea mays L.) or soybean (Glycine max (L.) Merr) to elevation, slope, planar curvature, or profile curvature. From these studies, we extracted correlations between yield and topographic variables for 86 site-years. We assessed the response of yield–topography correlations to the spring and total growing season precipitation of each site-year. Averaged across all site-years, maize yield was negatively correlated to elevation and planar curvature while soybean yield was negatively correlated to slope. For maize, the correlations between yield and elevation, slope, planar curvature, and profile curvature increased from negative to positive with increasing growing season precipitation, whereas for soybean the correlations between yield and elevation and between yield and slope became more negative with increasing growing season precipitation. Spring precipitation was a better predictor of yield–topography correlations than growing season precipitation for soybean but not for maize. We conclude that maize and soybean generally yield higher in low-elevation and low-slope landscape positions, respectively, but the yield–topography relationships vary with precipitation.
    Keywords Glycine max ; Zea mays ; corn ; crop yield ; landscapes ; research ; soybeans ; spring ; weather
    Language English
    Dates of publication 2022-0201
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 435684-6
    ISSN 1872-6852 ; 0378-4290
    ISSN (online) 1872-6852
    ISSN 0378-4290
    DOI 10.1016/j.fcr.2021.108368
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  8. Article ; Online: A method for phenotyping roots of large plants

    Rinehart, Brian / Poffenbarger, Hanna / Lau, Daniel / McNear, Dave

    The Plant Phenome Journal. 2022, v. 5, no. 1 p.e20041-

    2022  

    Abstract: Linking root traits to plant functions can enable crop improvement for yield and ecosystem functions. However, plant breeding efforts targeting belowground traits are limited by appropriate phenotyping methods for large root systems. While advances have ... ...

    Abstract Linking root traits to plant functions can enable crop improvement for yield and ecosystem functions. However, plant breeding efforts targeting belowground traits are limited by appropriate phenotyping methods for large root systems. While advances have been made allowing for imaging large in situ root systems, many of these methods are inaccessible due to expensive technology requirements. The aim of this work was to develop a plant phenotyping platform and analysis method suitable for assessing root traits of large, intact root systems. With the use of a purpose‐built imaging table and automated photo capture system, machine learning‐based image segmentation, and off‐the‐shelf trait analysis software, the developed method yielded results of comparable accuracy to commercial root scanning platforms without requiring access to prohibitively expensive equipment. This methodology enables root studies to move beyond the size limitations of scanner‐based methods, integrate whole‐system traits like root depth distribution, and save time on root image capture.
    Keywords automation ; computer software ; ecosystems ; equipment ; image analysis ; phenotype
    Language English
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ISSN 2578-2703
    DOI 10.1002/ppj2.20041
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  9. Article: Rye Cover Crop and In-Furrow Fertilizer and Fungicide Impacts on Corn Optimum Seeding Rate and Grain Yield

    Quinn, Daniel J. / Poffenbarger, Hanna J. / Lee, Chad D.

    European journal of agronomy. 2022 Apr. 25,

    2022  

    Abstract: Higher corn seeding rates and in-furrow fertilizer and fungicide combinations may be effective tools to overcome early-season corn (Zea mays L.) stress, stand reductions, and yield loss following a rye (Secale cereale L.) cover crop (RCC). The objective ... ...

    Abstract Higher corn seeding rates and in-furrow fertilizer and fungicide combinations may be effective tools to overcome early-season corn (Zea mays L.) stress, stand reductions, and yield loss following a rye (Secale cereale L.) cover crop (RCC). The objective of this research trial was to evaluate corn growth and yield response and optimum seeding rate requirement following a RCC and different in-furrow starter treatments. Trials were established at three Kentucky, USA locations (2017-20, 7 site-years to evaluate corn response to seeding rate (49421 – 108726 seeds ha⁻¹) following a RCC and no cover crop, and in-furrow fertilizer (10-34-0) + fungicide (pyraclostrobin) and no in-furrow starter. At 2 of 3 locations, a RCC reduced corn V5 chlorophyll content and grain yield by 3.1 and 2.7%, respectively. The inclusion of an in-furrow starter failed to increase corn yield at any location and no interaction with a RCC was observed. Furthermore, an in-furrow starter reduced corn plant stand by 3.2% at 2 of 3 locations. At Lexington, quadratic regression analysis revealed that a higher corn agronomic optimum seeding rate (AOSR) and economic optimum seeding rate (EOSR) was required to maximize corn following a RCC compared to no cover crop. However, no significant stand loss was observed at this location. Overall, these results suggest that in-furrow fertilizer and fungicide do not ameliorate negative effects from a RCC and may cause negative impacts when applied simultaneously in-furrow. In addition, a higher corn AOSR and EOSR may be required following a RCC to maximize corn yield. However, because the effects of a RCC on AOSR were inconsistent among locations, further research may be required.
    Keywords Secale cereale ; Zea mays ; agronomy ; chlorophyll ; corn ; cover crops ; fertilizers ; grain yield ; pyraclostrobin ; regression analysis ; rye ; Kentucky
    Language English
    Dates of publication 2022-0425
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 1157136-6
    ISSN 1873-7331 ; 1161-0301
    ISSN (online) 1873-7331
    ISSN 1161-0301
    DOI 10.1016/j.eja.2022.126529
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  10. Article: Genetic Variation and Heritability of Sensory and Artisan Bread Traits in a Set of SRW Wheat Breeding Lines.

    Castellari, Maria P / Simsek, Senay / Ohm, Jae-Bom / Perry, Robert / Poffenbarger, Hanna J / Phillips, Timothy D / Jacobsen, Krista L / Van Sanford, David A

    Foods (Basel, Switzerland)

    2023  Volume 12, Issue 13

    Abstract: Focus on local food production and supply chains has heightened in recent years, as evidenced and amplified by the COVID-19 pandemic. This study aimed to assess the suitability of soft red winter (SRW) wheat breeding lines for local artisan bakers ... ...

    Abstract Focus on local food production and supply chains has heightened in recent years, as evidenced and amplified by the COVID-19 pandemic. This study aimed to assess the suitability of soft red winter (SRW) wheat breeding lines for local artisan bakers interested in locally sourced, strong gluten wheat for bread. Seventy-six genotyped SRW wheat breeding lines were milled into whole wheat flour and baked into small loaves. Bread aroma, flavor, and texture were evaluated by a sensory panel, and bread quality traits, including sedimentation volume, dough extensibility, and loaf volume, were measured to estimate heritability. SE-HPLC was performed on white flour, and breeding lines were characterized for different protein fraction ratios. Heritability of loaf volume was moderately high (h
    Language English
    Publishing date 2023-07-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2704223-6
    ISSN 2304-8158
    ISSN 2304-8158
    DOI 10.3390/foods12132617
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