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Lesson Outline

Faculty/Instructor

Deana Namuth-Covert
Agronomy & Horticulture Exten Assoc Professor
dcovert2@unl.edu

Soils - Part 6: Phosphorus and Potassium in the Soil

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Summary

The nature of soil potassium can be summarized by Figure 6.4. Available soil potassium is found associated with the clay complex and soil solution. It is in equilibrium with the slowly available minerals, which are constantly supplying available potassium. Potassium is added by fertilizers and crop residues. Fertilizer potassium may be fixed and become slowly available; it may be lost by crop removal, leaching and erosion.

Figure 6.4.

Available potassium in relation to additions and losses.

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This project was supported in part by the National Research Initiative Competitive Grants CAP project 2011-68002-30029 from the USDA National Institute of Food and Agriculture, adminstered by the University of California-Davis and by the National Science Foundation (NSF), Division of Undergraduate Education, National SMETE Digital Library Program, Award #0938034, administered by the University of Nebraska. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the USDA or NSF.
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