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- 4-D; dicamba; Palmer amaranth; Amaranthus palmeri S. Watson; soybean; Glycine max (L.) Merr.; Auxin off-target movement; plant tissue analysis; auxin injury (1)
- 4-D; florpyrauxifen-benzyl; Palmer amaranth (1)
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- Agricultural pesticides; best management practices; economics; production agriculture; weed management; dicamba; glufosinate; Palmer amaranth; Amaranthus palmeri (S; ) Wats; cotton; Gossypium hirsutum L; soybean; Glycine max (L; ) Merr (1)
Articles 151 - 163 of 163
Full-Text Articles in Agronomy and Crop Sciences
Profit-Maximizing Potassium Fertilizer Recommendations For Soybean, Michael P. Popp, Nathan A. Slaton, Trenton L. Roberts
Profit-Maximizing Potassium Fertilizer Recommendations For Soybean, Michael P. Popp, Nathan A. Slaton, Trenton L. Roberts
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Potassium (K) fertilizer has important yield and cost ramifications in soybean [Glycine max (L.) Merr.] production. Rate recommendations are often based on expected yield response as predicted by a soil test. To that end, soybean response to K application rate studies were analyzed using 86 site-years from 2004 to 2019. We estimated a generic yield response curve across soybean cultivar and soil texture to allow calculation of profit-maximizing K rates for producers in the mid-southern United States that also consider crop value and fertilizer cost. Further, we compared profit-maximizing fertilizer-K rates with those currently recommended. Using a spreadsheet-based decision …
Recombinase-Mediated Integration Of A Multigene Cassette In Rice Leads To Stable Expression And Inheritance Of The Stacked Locus, Bhuvan Pathak, Vibha Srivastava
Recombinase-Mediated Integration Of A Multigene Cassette In Rice Leads To Stable Expression And Inheritance Of The Stacked Locus, Bhuvan Pathak, Vibha Srivastava
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Efficient methods for multigene transformation are important for developing novel crop varieties. Methods based on random integrations of multiple genes have been successfully used for metabolic engineering in plants. However, efficiency of co-integration and co-expression of the genes could present a bottleneck. Recombinase-mediated integration into the engineered target sites is arguably a more efficient method of targeted integration that leads to the generation of stable transgenic lines at a high rate. This method has the potential to streamline multigene transformation for metabolic engineering and trait stacking in plants. Therefore, empirical testing of transgene(s) stability from the multigene site-specific integration locus …
Soybean Maturity Group And Planting Date Influence Grain Yield And Nitrogen Dynamics, Carrie C. Ortel, Trenton L. Roberts, Kyle A. Hoegenauer, Larry C. Purcell, Nathan A. Slaton, Edward E. Gbur
Soybean Maturity Group And Planting Date Influence Grain Yield And Nitrogen Dynamics, Carrie C. Ortel, Trenton L. Roberts, Kyle A. Hoegenauer, Larry C. Purcell, Nathan A. Slaton, Edward E. Gbur
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Manipulation of soybean [Glycine max (L.) Merr.] maturity group (MG) and planting date will increase the yield of a soybean crop while simultaneously influencing the potential soil-nitrogen (N) credits. Variations in N returned to the soil by soybean can significantly affect the amount of fertilizer-N needed for the subsequent crop. Four soybean MGs (3.5, 4.7, 5.4, and 5.6) were evaluated at optimal and late planting dates in Arkansas. Grain yield was significantly different among MGs in 2016 (P = .0012) and 2017 (P = .0004), with the 4.7 MG consistently yielding the highest at 3,232 kg ha(-1). Plant total aboveground …
Soybean Response To Dicamba Exposure In Furrow Irrigation, Erin Grantz, Jung Ae Lee, Cammy Willett, Jason K. Norsworthy
Soybean Response To Dicamba Exposure In Furrow Irrigation, Erin Grantz, Jung Ae Lee, Cammy Willett, Jason K. Norsworthy
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Sensitive crop exposure to residual dicamba in irrigation is a potential hazard in regions with overlapping use of transgenic dicamba-resistant crops and on-farm water storage-tailwater recovery (OFWS-TWR) systems. This field study examined non-dicamba-resistant soybean [Glycine max (L.) Merr.] for response to a dicamba dose gradient (7.6-630 g ae ha(-1)) in a furrow irrigation system. In a second study, growth stage and application timing effects were explored, with dicamba applied at 160 g ae ha(-1) in entirety to V3 or R1 soybean or split across exposure events. Plant injury 14 and 28 d after treatment (DAT) increased with dose, with significant …
Comparison Of Soil Sampling Techniques For Alkaline Hydrolyzable-Nitrogen On Clay Soils, Jarom T. Davidson, Trenton L. Roberts, Jarrod T. Hardke, Nathan A. Slaton, Anthony Michael Fulford
Comparison Of Soil Sampling Techniques For Alkaline Hydrolyzable-Nitrogen On Clay Soils, Jarom T. Davidson, Trenton L. Roberts, Jarrod T. Hardke, Nathan A. Slaton, Anthony Michael Fulford
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
The Nitrogen-Soil Test for Rice (N-STaR) provides a site-specific N rate recommendation by quantifying alkaline hydrolyzable-N (AH-N). A user-friendly method for obtaining a representative N-STaR soil sample is needed, and this study was designed to evaluate the performance of alternative sampling techniques compared with the Dutch auger (DA). The alternative techniques included a Kleen Hole Spade dry (KHS-D), a KHS lubricated with water (KHS-W), a KHS lubricated with WD-40 (KHS-40), and the N-STaR Bucket and Drill (BD). One soil sample was collected with each sampling technique from four blocks and was repeated across 14 sites. Each sample was analyzed for …
Soil Quality Indices Based On Long-Term Conservation Cropping Systems Management, Helen C.S. Amorim, Amanda J. Ashworth, Brian J. Wienhold, Mary C. Savin, Fred L. Allen, Arnold M. Saxton, Phillip R. Owens, Nilton Curi
Soil Quality Indices Based On Long-Term Conservation Cropping Systems Management, Helen C.S. Amorim, Amanda J. Ashworth, Brian J. Wienhold, Mary C. Savin, Fred L. Allen, Arnold M. Saxton, Phillip R. Owens, Nilton Curi
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
The Soil Management Assessment Framework (SMAF) may provide insight into how conservation practices affect soil quality (SQ) regionally. Therefore, we aimed to quantify SQ in a long-term (15-yr) crop rotation and bio-covers experiment under no-tillage using SMAF. Main effects were cropping rotations of soybean [Glycine max (L.) Merr.], corn (Zea mays L.), and cotton (Gossypium hirsutum L.). Split-block bio-cover treatments consisted of winter wheat (Triticum aestivum L.), Austrian winter pea (Pisum sativum L. sativum var. arvense), hairy vetch (Vicia villosa Roth), poultry litter, and fallow (control). Seven SQ indicators—soil pH, total organic carbon …
Residual Herbicide Concentrations In On-Farm Water Storage–Tailwater Recovery Systems: Preliminary Assessment, Erin M. Grantz, Deborah Leslie, Michele Reba, Cammy Willett
Residual Herbicide Concentrations In On-Farm Water Storage–Tailwater Recovery Systems: Preliminary Assessment, Erin M. Grantz, Deborah Leslie, Michele Reba, Cammy Willett
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
On-farm water storage–tailwater recovery systems reduce groundwater usage and intercept agrochemical loads, but pesticide residue dynamics in these systems are not well understood. This study monitored concentrations of seven herbicides in seven northeast Arkansas tailwater recovery systems (April 2017–March 2018). Clomazone, glyphosate, metolachlor, and quinclorac were frequently detected, with minimal detections of 2,4-D, dicamba, and propanil. Concentrations peaked during the growing season (1 Apr.–15 Sept.), reflecting an interaction of application and precipitation. Clomazone, glyphosate, and quinclorac concentrations were greater in ditches (−1, respectively) than in the associated reservoir (−1, respectively), but metolachlor concentrations were not different between structure types (maximum …
Comparison Of Weed Control Technologies For Protoporphyrinogen Oxidase-Resistant Palmer Amaranth, Michael Mckinley Houston, L. Tom Barber, Jason K. Norsworthy, Trenton L. Roberts
Comparison Of Weed Control Technologies For Protoporphyrinogen Oxidase-Resistant Palmer Amaranth, Michael Mckinley Houston, L. Tom Barber, Jason K. Norsworthy, Trenton L. Roberts
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Confirmation of protoporphyrinogen oxidase (PPO)-resistant Palmer amaranth (Amaranthus palmeri S.Watson) in 2015 limited weed control options for soybean [Glycine max (L.) Merr.] producers. With already prevalent 5-enolpyruvyl-shikimate-3-phosphate synthase-, acetolactate synthase-, beta-tubulin-, and very-long-chain fatty acid-resistant Palmer amaranth, there are few remaining effective pre-emergence and postemergence herbicides labeled in soybean. The recent commercialization of soybean varieties resistant to dicamba and 2,4-D give producers effective options to control multiresistant Palmer amaranth. To evaluate new and existing technologies and postemergence herbicide options, two experiments were conducted in 2017. These experiments were conducted in Marion and Crawfordsville, AR, two locations with confirmed …
Benzobicyclon Carryover To Crops In The Mississippi Delta, Jason K. Norsworthy, Mason L. Young
Benzobicyclon Carryover To Crops In The Mississippi Delta, Jason K. Norsworthy, Mason L. Young
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
One experiment was conducted from 2015 to 2016 on a Calloway and Dewitt silt loam soil near Pine Tree (pH 8.3) and Stuttgart (pH 6.0), Arkansas, respectively. The objective was to evaluate the potential for a benzobicyclon application to carryover from rice and cause damage to corn, cotton, grain sorghum, soybean, and sunflower planted the subsequent year. No injury or stand reduction occurred for any crop after applications of benzobicyclon at 0.22 and 0.44 lb a.i. acre−1 at either location. Grain sorghum had a 29% height reduction at Pine Tree at 12 d after planting (DAP); however, no differences …
Effect Of Low-Use-Rate Zinc Fertilization On Rice Growth And Grain Yield, Maxwell D. Coffin, Nathan A. Slaton
Effect Of Low-Use-Rate Zinc Fertilization On Rice Growth And Grain Yield, Maxwell D. Coffin, Nathan A. Slaton
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Low-use-rate Zn fertilization methods have been developed and marketed for rice (Oryza sativa L.) fertilization with limited research validating their efficacy. Our research objectives were to evaluate the effect of Zn-seed treatment rate combined with six Zn-fertilization methods on early season canopy coverage, tissue-Zn concentration at the mid-tillering stage, and rice grain yield. The field experiment was conducted on six silt loams and one clay. Rice seed was treated with 0 or 3.3 g Zn kg(-1) as ZnO and combined with no Zn, granular ZnSO4 applied at 11 kg Zn ha(-1) (GRAN), 1.68 kg Zn ha(-1) as MicroEssentials (MESZ), 1.1 …
Phosphorus Runoff Risk Assessment In Karstic Regions Of The United States, Andrew N. Sharpley, Phillip D. Hays, Karl W. Vandevender, Mike B. Daniels
Phosphorus Runoff Risk Assessment In Karstic Regions Of The United States, Andrew N. Sharpley, Phillip D. Hays, Karl W. Vandevender, Mike B. Daniels
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
The Phosphorus (P) Index risk assessment tool has been widely adopted across the United States to identify and rank site vulnerability to P runoff as part of the Natural Resources Conservation Service nutrient management planning (NMP) process. However, limited success has been achieved in addressing the risk of P loss by subsurface flow pathways, despite its relative importance in certain areas of the United States, particularly in those U.S. states dominated by karst terrain. Here we review how states with varying land areas classified as having karst features address the risk of P runoff during the NMP process. Indices adopted …
Quantification Of Palmer Amaranth Seed Number Using A Computerized Particle Analyzer, Matthew B. Bertucci, Paul C. Bartley Iii, Katherine M. Jennings, David W. Monks, Brian E. Jackson
Quantification Of Palmer Amaranth Seed Number Using A Computerized Particle Analyzer, Matthew B. Bertucci, Paul C. Bartley Iii, Katherine M. Jennings, David W. Monks, Brian E. Jackson
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
We evaluated the accuracy of a computerized particle analyzer (CPA) for high-throughput counting of Palmer amaranth (Amaranthus palmeri S. Watson) seeds and subsequently used the CPA to verify the accuracy of two subsampling methods for estimation of Palmer amaranth seed production. To determine accuracy of the CPA, 55 hand-counted samples, ranging from 500 to 5000 Palmer amaranth seeds, were drawn from field samples and counted with the CPA. The relationship between hand and CPA seed counts was described by a linear model (R-2 = 0.99) with a slope of 0.987 and a y-intercept of 3.49. Thus, very little discrepancy exists …
Heat-Shock-Inducible Crispr/Cas9 System Generates Heritable Mutations In Rice, Soumen Nandy, Bhuvan Pathak, Shan Zhao, Vibha Srivastava
Heat-Shock-Inducible Crispr/Cas9 System Generates Heritable Mutations In Rice, Soumen Nandy, Bhuvan Pathak, Shan Zhao, Vibha Srivastava
Crop, Soil and Environmental Sciences Faculty Publications and Presentations
Transient expression of CRISPR/Cas9 is an effective approach for limiting its activities and improving its precision in genome editing. Here, we describe the heat-shock-inducible CRISPR/Cas9 for controlled genome editing, and demonstrate its efficiency in the model crop, rice. Using the soybean heat-shock protein gene promoter and the rice U3 promoter to express Cas9 and sgRNA, respectively, we developed the heat-shock (HS)-inducible CRISPR/Cas9 system, and tested its efficacy in targeted mutagenesis. Two loci were targeted in rice, and the presence of targeted mutations was determined before and after the HS treatment. Only a low rate of targeted mutagenesis was detected before …