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Agronomy Journal : Just Published

 

Accepted, edited articles are published here after author proofing to provide rapid publication and better access to the newest research. Articles are compiled into issues at dl.sciencesocieties.org/publications/aj, which includes the complete archive.

Citation | Articles posted here are considered published and may be cited by the doi.

Zhu, Q., M.J. Schlossberg, R.B. Bryant, and J.P. Schmidt. 2012. Creeping bentgrass putting green response to foliar nitrogen fertilization. Agron. J. doi:10.2134/agronj2012.0157

Current issue: Agron. J. 109(6)



  • AGRONOMY, SOILS & ENVIRONMENTAL QUALITY

    • William R. Osterholz, Mark J. Renz, Joseph G. Lauer and John H. Grabber
      Prohexadione-Calcium Rate and Timing Effects on Alfalfa Interseeded into Silage Corn

      Prohexadione-calcium (PHD) can enhance establishment of alfalfa (Medicago sativa L.) interseeded into silage corn (Zea mays L.), but optimal application rates and timing for this growth regulator are unknown. Two experiments examined how single or split applications of 0.25 to 1.0 kg a.i. ha–1 of PHD applied to 15 or 25 cm tall glyphosate-resistant alfalfa seedlings influenced growth, stand density, and yield of alfalfa and corn compared to untreated controls. The PHD treatments reduced seedling top growth by 13 to 32% and increased stand density of alfalfa by 19 to 81% in three out of four locations and alfalfa dry matter yield by 4 to 23% in two out of four locations the following year. (continued)

      Core Ideas:
      • Higher prohexadione rates of 0.5 to 1 kg a.i. ha–1 enhanced interseeded alfalfa establishment and yield under stressful establishment conditions.
      • Prohexadione application to 15 vs. 25 cm tall alfalfa seedlings provided similar improvements in alfalfa stand density and yield.
      • Interseeding alfalfa increased overall corn+alfalfa forage production by 12%.

      doi:10.2134/agronj2017.05.0298
      Published: November 3, 2017



  • CROP ECOLOGY & PHYSIOLOGY

    • John A. Guretzky, Cheryl D. Dunn and Andy Bishop
      Plant Community Structure and Forage Nutritive Value of Reed Canarygrass-Invaded Wetlands

      Many wetlands across the United States have been threatened by reed canarygrass (Phalaris arundinacea L.) invasion. The use of reed canarygrass as forage may provide a revenue stream for agricultural producers while improving wetland ecosystem services. This study was conducted to evaluate the effects of forage harvest frequency (zero, one, two, and three times per year) on plant community structure and nutritive value in reed canarygrass–invaded wetlands. The research was conducted in two wetlands (North Lake Basin [NLB] and Straight Water [SW]), with frequently ponded soils in Seward County, NE, from 2011 to 2013. (continued)

      Core Ideas:
      • Frequently harvesting reed canarygrass best maintains species richness in wetlands.
      • Frequently harvesting reed canarygrass reduces its cover, a benefit to waterfowl.
      • Reed canarygrass has nutritive value that exceeds needs of spring-calving beef cows.

      doi:10.2134/agronj2017.05.0277
      Published: November 9, 2017



    • Kevin Laskowski, Kevin Frank and Emily Merewitz
      Surfactant Effects on Creeping Bentgrass and Annual Bluegrass Exposed to Different Irrigation and Traffic Stress Treatments

      Creeping bentgrass (Agrostis stolonifera L.) and annual bluegrass (Poa annua L.) are turfgrass species that experience water and excessive foot traffic stresses on putting greens. The objective of this study was to investigate whether a soil surfactant would play a role in promoting tolerance to excessive water, water deficit, and traffic stress on annual bluegrass and creeping bentgrass sand-based rootzone putting greens. A soil surfactant was applied as a foliar spray (18.5 L ha–1) to creeping bentgrass cultivar Penn A-4 and annual bluegrass field plots and watered-in under three target soil volumetric water contents (SWC) (8, 12, and 16% SWC). Foot traffic was applied in summer 2013 and 2014 with a traffic simulator to represent low traffic (5688 rounds of golf), moderate traffic (11,376 rounds of golf), and no traffic (control). (continued)

      Core Ideas:
      • Automated irrigation can be set below optimal levels while using a soil surfactant.
      • A soil surfactant decreased soil water content when targeting above ideal irrigation.
      • A soil surfactant increased turf quality and normalized difference vegetative index.
      • Turf quality, under foot traffic, is improved with the use of a soil surfactant.

      doi:10.2134/agronj2017.05.0261
      Published: November 3, 2017



  • NOTES AND UNIQUE PHENOMENA

    • Spyridon Mourtzinis, John Gaska, Thierno Diallo, Joe G. Lauer and Shawn Conley
      Legacy Effects of Three Management Practices on Corn, Soybean, and Wheat Yield

      The effect of management on subsequent crop yield and quality variability is an important concern. However, there are a lack of studies that examine legacy effects of important management practices on corn (Zea mays L.), soybean [Glycine max (L.) Merr.], and wheat grain yield (Triticum aestivum L.). The objective of this study was to examine the legacy effect of N fertilizer and foliar fungicide, on corn, soybean, and wheat grown in rotation in no-till (NT) and the use of nematicide seed treatment under conventional and NT systems on corn, and soybean grown in rotation. Data were collected in 2016 in Wisconsin from two long-term crop rotation experiments conducted during 2013 to 2015, that had continuous management treatments applied (N, foliar fungicide, tillage, and nematicide seed treatment). (continued)

      Core Ideas:
      • Effect of management on subsequent crop yield variability is an important concern.
      • There was no evidence of legacy fungicide effect on corn, soybean, and wheat yield.
      • Corn silage and wheat after soybean exhibited a quadratic response to residual N.

      doi:10.2134/agronj2017.05.0254
      Published: November 16, 2017



  • SOIL FERTILITY & CROP NUTRITION

    • Md. Rasel Parvej, Anna S. Williams, David L. Holshouser, William H. Frame and Mark S. Reiter
      Double-Crop Soybean Response to Potassium on Mid-Atlantic Coastal Plain and Piedmont Soils

      Potassium fertilization research on soybean [Glycine max (L.) Merr.] double cropped with winter wheat (Triticum aestivum L.) is lacking. We characterized double-crop soybean response to fertilizer K across 22 Coastal Plain and Piedmont sites with and/or without wheat straw removal during 2013 to 2015. Mehlich-1 soil-K concentrations at 0- to 15- and 0- to 30-cm depths were better in explaining relative yield variability (r2 = 0.80), defining critical soil-K concentrations that ranged from 40 to 75 mg K kg–1 for 0- to 15-cm and 36 to 66 mg K kg–1 for 0- to 30-cm depths, and identifying K-deficient sites (100% accurate) than soil-K concentration at 0- to 60-cm depth (r2 = 0.48; 56% accurate). Critical soil-K concentration at 0- to 30-cm depth did not change with wheat straw management, but slightly increased at 0- to 15-cm depth when straw was removed. (continued)

      Core Ideas:
      • Soil K at 0- to 15 and 0- to 30-cm depths were excellent in predicting double-crop soybean relative yield.
      • Double-crop soybean required more fertilizer K to maximize yield than current recommendations.
      • Fertilizer-K rate can be reduced if recommendations are made based on 0- to 30-cm than 0- to 15-cm depth.
      • Double-crop yield response to fertilizer K depended on soil K but not on wheat straw management.
      • Straw management may not be an issue in recommending fertilizer K based on soil K at 0- to 30-cm depth.

      doi:10.2134/agronj2017.07.0397
      Published: November 16, 2017



    • Anna S. Williams, Md. Rasel Parvej, David L. Holshouser, William H. Frame and Mark S. Reiter
      Correlation and Calibration of Soil-Test Potassium from Different Soil Depths for Full-Season Soybean on Coarse-Textured Soils

      Quantifying soil-K availabilities at deeper depths may be necessary to determine optimum fertilizer-K rate for soybean [Glycine max (L.) Merr.] grown on low cation exchange capacity (CEC) soils that are prone to K leaching. We characterized full-season soybean response to fertilizer-K across 19 coarse-textured low-CEC sites during 2013 and 2014. Mehlich-1 soil-K concentrations at 0- to 15- and 0- to 30-cm depths better correlated with relative yield and explained 90% of relative yield variation compared to 77% for 0- to 60-cm depth. Critical soil-K concentrations were similar for relative yield, V5 plant-K concentration, and R2 leaf-K concentration, ranging from 48 to 73 mg K kg–1 for 0- to 15-cm and 41 to 63 mg K kg–1 for 0- to 30-cm depths. (continued)

      Core Ideas:
      • Soil K at 0- to 15- and 0- to 30-cm depths were excellent predictors of full-season soybean relative yield.
      • Tissue-K concentration can be used for calibrating fertilizer-K rate and in-season K management.
      • Soil sampling to 30-cm depth would reduce fertilizer amount and cost for soybean on low cation exchange capacity soils.

      doi:10.2134/agronj2017.06.0344
      Published: November 9, 2017



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