2008 Joint Annual Meeting (5-9 Oct. 2008): Preliminary Assessment of the Potassium Buffering Capacity of Selected Arkansas Soils.
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667-5 Preliminary Assessment of the Potassium Buffering Capacity of Selected Arkansas Soils.



Tuesday, 7 October 2008
George R. Brown Convention Center, Exhibit Hall E
Jose Pantoja Sr., Department of Crop, Soil, & Environment Sciences, University of Arkansas, 115 Plant Science Building, Fayetteville, AR 72701, Leonel Espinoza, University of Arkansas, PO Box 391, Little Rock, AR 72203 and David M. Miller, Crop, Soil and Environmental Sciences, University of Arkansas, 115 Plant Science, Fayetteville, AR 72701
Potassium (K+) is one of the plant nutrients used in large quantities by Arkansas farmers to maximize crop yields. Although total soil K+ exceeds crop uptake during the growing season, only a small fraction of this K+ is available to plants. In soils, K+ is found in equilibrium among four phases which are: solution, exchangeable, non-exchangeable, and structural, with the interaction among those phases determining the availability of K+ for plant uptake. It is well known that soils differ on their ability to replenish soil solution K+  due to plant uptake and that a better understanding of the kinetics of K+ release would improve the accuracy of soil testing to derive fertilizer recommendations. Soil samples varying in soil texture and testing low in exchangeable Mehlich-3 K+ levels were collected from several regions in Arkansas, with the objective of characterizing their Quantity/Intensity relationships (buffer power). Preliminary results of this effort will be presented.
See more of: Nutrients in Soil Environments (Posters)
See more of: S02 Soil Chemistry