Which soil structure will provide the best internal drainage?

Granular soil structure is known for its rounded aggregates that allow for greater porosity and beneficial air spaces, which enhances internal drainage. This structure promotes good water infiltration and reduces surface runoff, making it easier for excess water to drain away from the root zone.

In contrast, blocky and angular structures can retain water more effectively due to their tight formation and variable pore sizes, which can restrict drainage compared to granular soils. Massive soil structure increases compaction and lowers porosity, making it one of the least effective structures for drainage. Therefore, the granular structure is ideal for providing the best internal drainage in agricultural practices.