Statements (52)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
Soil
|
| gptkbp:class |
gptkb:USDA_soil_taxonomy
gptkb:World_Reference_Base_for_Soil_Resources |
| gptkbp:color |
black
brown dark gray |
| gptkbp:covers |
about 2.4% of Earth's ice-free land
|
| gptkbp:difficulty |
agriculture
|
| gptkbp:feature |
high fertility
base saturation > 50% calcium-rich deep cracks when dry difficult tillage expansive soils gilgai microrelief hard when dry high cation exchange capacity low organic matter low permeability magnesium-rich poor drainage prone to engineering problems require drainage for crops require timing of tillage seasonal waterlogging self-mulching shrink-swell capacity slickensides smectite clay minerals sticky when wet surface crusting vertic horizon |
| gptkbp:foundIn |
subtropical regions
temperate regions tropical regions |
| gptkbp:hasHigh |
gptkb:ceramics
|
| https://www.w3.org/2000/01/rdf-schema#label |
Vertisols
|
| gptkbp:parentMaterial |
gptkb:stone
granite limestone alluvium |
| gptkbp:primaryUse |
rice cultivation
grazing sugarcane cultivation cotton cultivation wheat cultivation sorghum cultivation |
| gptkbp:requires |
special management
|
| gptkbp:bfsParent |
gptkb:USDA_Soil_Taxonomy_(1960s)
gptkb:USDA_soil_taxonomy gptkb:USDA_Soil_Taxonomy |
| gptkbp:bfsLayer |
7
|