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1. 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 |
2. 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 |
3. 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 |
4. Carbon & Nitrogen Transformation in Soil After Biosolids or Inorganic Fertilizer ApplicationBiosolids are nutrient rich organic residues which could be a potential alternative to conventional fertilizers. However, their C and N mineralization rates vary depending on treatment processes and soil properties. A laboratory incubation was carried out to evaluate C and N dynamics in contrasting soils by quantifying gaseous losses and assessing N transformations between organic and inorganic pools. Soils collected from Texas (sandy clay loam, pH: 8.4) and Florida (sandy loam, pH: 7.6) were... S. Bhatta, L. Slaughter, M. Siebecker, J. Adjei, K. Lewis, O. Gecgel, C. Alvarez-pugliese, K. Millerick, B. Rao, O. Mbuya, G.G. Botte |
5. Evaluation of E-Grow Effects on Soil Plant Systems Gas ExchangeE-Grow is a novel fertilizer which effect on the soil- plant system is critical for understanding it’s impact on the crop productivity and environmental sustainability in agricultural operations that will be crucial for updating nutrient application recommendations, to understand this we conducted an experiment with the main objective of this study is to determine the effect of E-Grow on CO2 and H2O fluxes in agricultural soil and soil- cotton plant systems (seedling stage). This experiment... V. Sabbineni, E. Enninful, S. Jacobo, O. Gecgel, G.G. Botte, H. Laza, C. Simpson, L. Slaughter, Y. Emendack |