129-10 Extractable K in Kansas Soils: Effects of Soil Moisture and Drying Conditions.

Poster Number 1150

See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Soil Testing and Plant Analysis
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Angela Tran1, Ganga Hettiarachchi1, Michel D. Ransom2, David Mengel3, Jason Matz4 and Paul Hartley5, (1)Agronomy, Kansas State University, Manhattan, KS
(2)2004 Throckmorton Plant Science Center, Kansas State University, Manhattan, KS
(3)3703 Throckmorton Hall, Kansas State University, Manhattan, KS
(4)Kansas State University, Manhattan, KS
(5)2004 Throckmorton Hall, Kansas State University, Manhattan, KS
Potassium (K) is an essential nutrient for plant development, and in recent years, an increasingly expensive fertilizer input—thus increasing the importance of accurate soil test results in making agronomically and economically prudent nutrient management decisions. In parts of southeast Kansas, soil K test results have shown inexplicable swings from year to year and have been poorly correlated with fertilizer response. To determine whether or not the processing procedure for soil testing laboratories influences extractable K results, the effects of drying time, drying temperature, soil moisture content, and wetting-drying cycles were studied. Soil samples from four southeast Kansas sites exhibiting unusual K behavior and three northeastern Kansas sites with more typical behavior were subjected to a variety of drying time, drying temperature, and moisture conditions and then extracted with 1M ammonium acetate. The results indicate negligible effect of drying time, temperature, and moisture conditions on extractable K values.
See more from this Division: S08 Nutrient Management & Soil & Plant Analysis
See more from this Session: Soil Testing and Plant Analysis