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Irrigation water passes through a bed of sand and gravel, which acts as a filter medium to remove impurities and sediment. As the water flows through the gravel, the minerals present in it slowly dissolve into the water and are released into the soil during irrigation. This provides a constant source of nutrients and trace elements for the plants.
Volcanic gravel is especially useful for agriculture on mineral-deficient soils due to its ability to slowly release nutrients and maintain a constant concentration in irrigation water. In addition, this material is strong and durable, meaning it can be reused multiple times before needing to be replaced.