Concepts of Soil Fertility and Productivity (pdf)
Soil Fertility Manual Chapter 1
Darst, Bob, Stewart, Mike
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 soilís 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.
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|Time To Complete (hours)
- Understanding essential plant nutrients
- Soil texture and structure
- Soil colloids and ions
- Cation exchange capacity
- Anion retention in soil
- Soil organic matter
- Other factors affecting soil productivity