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1. A New Hydroponic System for Testing Mineral Nutrient Deficiencies and It's Application to SoybeansCorrelating plant tissue nutrient concentrations with visual symptoms is valuable in combating mineral nutrient deficiencies and toxicities. Due to changing climates and decreasing water supplies throughout the world, agricultural lands need to improve nutrient and water management in crops, including soybeans (Glycine max L.).Because nutrient concentrations can be easily controlled, hydroponics effectively demonstrate isolated specific nutrient related symptoms. However, many hydroponic... A.M. Lambert, S.M. Anderson, D.L. Cole, A. Haderlie, C.J. Seely, B.G. Hopkins |
2. 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 |
3. 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 |
4. 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 |