1. A type of soil with a bleached, leached upper layer overlying a dense, impermeable layer, typically found in poorly drained areas with seasonal waterlogging.
Usage: technical; soil science; plural form of planosol

Examples

• Planosols are commonly found in flat, low-lying regions with high water tables.
• The farmer's field contained planosols that required drainage improvements for crop cultivation.
• Soil scientists classify planosols by their characteristic bleached A-horizon and impermeable B-horizon.
• Planosols often develop under temperate climates with significant seasonal precipitation.
• The presence of planosols in the survey area indicated poor natural drainage conditions.