claypan

n.

粘土层，粘土湖；

Clay pan
claypan:
Clay pan
Soil electrical conductivity as a crop productivity measure for claypan soils.
Phosphorus loss and runoff characteristics in three adjacent agricultural watersheds with claypan soils.
Delineating productivity zones on claypan soil fields using apparent soil electrical conductivity
Saturated hydraulic conductivity and its impact on simulated runoff for claypan soils.
Herbicide Contamination of Groundwater Beneath Claypan Soils in North-Central Missouri
Nitrogen losses in runoff from three adjacent agricultural watersheds with claypan soils
Corn Response to Conventional and Slow-Release Nitrogen Fertilizers across a Claypan Landscape