Agric horizon

{
  "id": "MLC-T-ENV-000762",
  "term": "Agric horizon",
  "field": "Environment",
  "term_source": "Agric Horizon",
  "definition": "The agric horizon is an illuvial horizon that has formed under cultivation and contains significant amounts of illuvial silt, clay, and humus. When a soil is brought under cultivation, the vegetation and the soil fauna as a rule are changed drastically. The plow layer is mixed periodically, and, in effect, a new cycle of soil formation is started. Even where the cultivated crops resemble the native vegetation, stirring of the plow layer and the use of amendments, especially lime, nitrogen, and phosphate, normally produce significant changes in soil structure, flora, and fauna.",
  "subject": "Natural environments",
  "references": [
    "USDA Natural Resources Conservation Service Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys (1999)"
  ],
  "url": "https://mlchart.com/terminology/environment/agric-horizon/"
}