soil types

For example, the largest particles, sand, determine aeration and drainage characteristics, while the tiniest, sub-microscopic clay particles, are chemically active, binding with water and plant nutrients. The ratio of these sizes determines soil type: clay, loam, clay-loam, silt-loam, and so on.

In addition to the mineral composition of soil, humus (organic material) also plays a crucial role in soil characteristics and fertility for plant life. Soil may be mixed with larger aggregate, such as pebbles or gravel. Not all types of soil are permeable, such as pure clay.

There are many recognized soil classifications, both international and national.

See also

• Brown earth
• Terra preta

External links

• Soil classification systems
• A Compendium of On-Line Soil Survey Information Soil Classification for Soil Survey
• Determining Soil Types

da:Jordtype de:Bodenart eo:Grundotipo es:Tipos de suelo fr:Liste des sols