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1. Results from the First Year of On-farm N Rate and Timing StudiesStudies have shown over the past couple of years that utilizing sensor based nitrogen rate calculator (SBNRC) for in-season fertilizer has proven beneficial to yields and protein in the southern Great Plains. However, current SBNRC recommendations and algorithm are based upon trials conducted in central Oklahoma, rather than regionally based. The objective of the larger study is to determine if it is possible to develop a regional dependency component of SBNRC in Oklahoma. For... V. Reed, J. Bigatao Souza, B. Finch, B. Arnall |
2. Impact of Fertilizer Management on the Stratification of Soil Characteristics in No-tillThe increasing cost of fuel and machinery makes no-till management (NT) a good alternative for producers. With the demanding increase of production, fertilizer utilization efficiency and cycling must be evaluated to address such demand. However, the superficial input of soil amendments under NT may lead to the soil stratification of pH and nutrients and in the first six inches. Three dry-land NT long-term trials located in Perkins, OK (NT since 2005), Stillwater, OK (NT since 2010) and Lahoma,... J. Bigatao Souza, V. Reed, B. Finch, B. Arnall |
3. Impact of Post-feekes 6 Nitrogen Application in Winter Wheat Forage ProductionProducers have options when choosing how to utilize their wheat acreage in Oklahoma. These include, grain harvest only, dual-purpose grazing and grain, and graze-out where the wheat crop is used solely for grazing cattle. Many producers take advantage of graze out wheat as a forage for cattle during the winter season. With acreages of approximately 400,000 acres of winter wheat grown for graze out production in the state of Oklahoma in 2018, many questions regarding management of wheat for grazing... B. Finch, V. Reed, J. Rogers, J. Bigatao Souza, B. Arnall |
4. Effect of Extractant pH on Exchangeable Cation Determination Using Ammonium Acetate and Mehlich-3Neutral pH ammonium acetate (1N NH4OAC, pH 7.0) is a standard soil test extractant for exchangeable cation concentrations. However, the concentrations may be artificially inflated for alkaline soils, especially those that are highly calcareous. The same effect potentially occurs with the Mehlich-3 extractant (Meh3, pH 2.5). The objective of this study was to determine the effect of pH on exchangeable base cation soil test concentrations. Soil samples from the High Plains region were randomly... F. Vocasek, B. Hopkins |
5. Experience with Using the Sikora-2 Soil/buffer pH Method in the Great PlainsThe acreage of acidic soils in the Great Plains continues to increase from long-term cropping and fertilizer nitrogen use. Acidic soils developed initially in dryland fields and/or in areas dominated by sandy soils, but are now relatively common in irrigated systems and finer-textured soils. A typical method used in the Great Plains states had been to determine soil pH in a 1:1 soil:water slurry and, when required, to determine exchangeable acidity using the SMP buffer solution. The buffer pH... F. Vocasek, S. Harrold |
6. Seeding Rate and Planting Configuration Affect the Interspecific Function of a Wheat-pea Cover CropCover crop species mixtures have potential to maximize overall biomass as well as net N contribution if temporary immobilization of available N by non-legume species can promote greater N fixation by legumes. The growth and ultimate function of legumes in cover crop species mixtures is often limited, however, by excessive competition with other species, particularly grasses, in the mix. The objective of this work is to identify optimum cool-season legume-grass cover... N. Nielsen, T. Hussain, R. Matschek, R. Noland, M. Mcculloch |
7. Plant Tissue Analysis: Do the Numbers Make Sense?Plant tissue analysis is a widely used nutrient management and diagnostic tool. Plant tissue nutrient concentrations are affected by many factors, including soil nutrient status, weather, and others. The interpretation of sufficiency/deficiency ranges in tissue samples helps to determine if growth problems are due to potential nutrient deficiencies or to other causes. Results of an individual analysis are only a one-time “snapshot” within a season-long time-frame. We conducted... F. Vocasek, S. Harrold |
8. Defining Critical Tissue-Potassium Concentrations for Furrow Irrigated Corn ProductionPotassium (K) is a critical nutrient for adequate corn (Zea mays L.) production, and tissue testing is an essential tool to ensure adequate K nutrition. Despite the important role of K in plant physiological functions, there are no calibrated critical tissue-K concentrations (TKc) for furrow-irrigated corn in Arkansas. This study aimed to define critical TKc values to maximize corn grain yield across different growth stages. From 2022 to 2024, twelve single-site-year and four long-term... J. Silva, G. Drescher, T. Roberts, J. Kelley, A. Smartt, Q. Sarfaraz, W. Rongey, G. Andrade Leite Mengez, M. Ramos Do Prado |