167 Symposium--Soil Potassium Tests and Their Relationship to Plant Availability and Native Mineralogy: I

Oral Session
SSSA Division: Soil Mineralogy
Potassium is an essential nutrient for plants, animals, and humans.  It has reemerged as a topic of scientific discussion.  This is due in part to erratic crop yield responses to potassium fertilizer additions, reports of potassium deficiencies, the rising costs of potassium fertilizers, and the difficulties encountered in developing soil potassium test recommendations which adequately mimic plant availability.  Moreover, the potassium supplying power of soils is impacted by the native minerals present and their complex interaction with plants, environmental conditions such as moisture content, and management.  The purpose of this joint symposium is to bring together scientists to explore how soil potassium tests relate to plant availability and mineralogy over a range in soil types, environmental conditions, and management practices in order to identify gaps in our understanding of the soil potassium cycle.   


Soil Fertility & Plant Nutrition
Nutrient Management & Soil & Plant Analysis

Monday, November 3, 2014: 12:55 PM-4:00 PM
Long Beach Convention Center, Room 203A

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Christopher J. Matocha and Peter C. Scharf
12:55 PM
Introductory Remarks
1:20 PM
Potassium Dynamics in Vertisols Following Potassium Fertilizer Application.
Balwant Singh, University of Sydney; Kathryn J Taylor, University of Sydney; Graeme Schwenke, NSW Department of Primary Industries
1:35 PM
Exchangeable K - Why Is It so Darn Complicated?.
Michael L. Thompson, Iowa State University; Taslima Stephen, Iowa State University
1:55 PM
Soil Testing for Potassium in Relation to Sample Handling and Mineralogy.
Antonio P. Mallarino, Iowa State University; Ryan R. Oltmans, Iowa State University; Michael L. Thompson, Iowa State University
2:35 PM
Soil Mineralogy and K Fixation in California Soils.
Randal J. Southard, University of California-Davis; G. Stuart Pettygrove, University of California Davis; Gordon L. Rees, University of California-Davis
2:55 PM
Is Soil-Test Potassium Meaningful for Crop Production and Soil Fertility Management in Arkansas?.
Nathan A. Slaton, University of Arkansas; Richard J. Norman, University of Arkansas; Trenton L. Roberts, University of Arkansas
3:15 PM
Long-Term Residual Effects of Potassium to Cotton on Soil Potassium Supply and Corn Productivity Under No-Tillage.
Xinhua Yin, University of Tennessee - Knoxville; Guisu Zhou, University of Tennessee-Knoxville; David Verbree, University of Tennessee - Knoxville
4:00 PM