Graduate Thesis Or Dissertation
 

Chemical properties of soils related to seasonal fluctuations in exchangeable potassium

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mp48sh23w

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  • Representative sites of the Dayton, Woodburn, Jory, Quillayute, Astoria, Willamette, Walla Walla, Deschutes, Laki and Owyhee soil series were investigated for seasonal changes in exchangeable potassium in air dry samples. No consistent seasonal variations were found which could be attributed to wetting and drying in the field. Cropping reduced the air dry exchangeable K in some soils as the growing season progressed. The laboratory analysis of exchangeable potassium in the Dayton soil was found to be affected by the physical nature of the extracting procedure. Changes in the shaking time, surface tension of the extractant, or temperature of the extractant resulted in different exchangeable K values. The differences between air- or oven-dried soil and moist soil were also affected by these physical factors. The differences between the two moisture levels were not wholly attributed to potassium fixation and release. The possibility of negative errors in the exchangeable K determination was pointed out.
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