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This site is dedicated to helping CCAs find the self-study CEUs they need – not just to maintain their certification but to improve their understanding of agronomic principles.

We feature online self-study CEUs in all the CCA performance objectives. We feature content from various sources including universities, industry and private consultants. Click on the tabs to the right to view content for each area.

All our CEUs are approved by the International CCA board or state boards. Scout the site and let us know if there is training content you would like to have listed, but don’t yet see.

Concepts of Soil Fertility and Productivity (pdf)
Soil Fertility Manual Chapter 1
Bob Darst; Mike Stewart
Understanding the principles of soil fertility is vital to efficient crop production and environmental protection. There are 17 chemical elements known to be essential for plant growth. Soil texture and structure influence the amount of air and water growing plants can secure. Soil colloids are very small, negatively charged particles of minerals and organic matter. An element with an electrical charge is called an ion. Cations have positive charges; anions have negative charges. Cation exchange capacity (CEC) is an expression of the amount of a soil’s negative charge and the amount of cations it can hold. Soil organic matter has many important benefits. Other key factors influencing soil productivity include soil depth, surface slope, soil organisms, and nutrient balance. This is the pdf version.
 

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