Macropore

Relatively large pore spaces in a soil that are greater than either 0.05mm or 0.075mm in diameter, depending on the classification used. Macropores are created by plant roots and soil fauna such as earthworms, nematodes, fungi, and bacteria. Increasing the amount of macropores within a soil improves drainage and aeration., with them often being air-filled at field capacity, in contrast to mesopores or storage micropores which will retain water at this stage.