Yes, volcanic soil can be loamy. The reference explicitly states that "Deep volcanic loams are particularly good for pasture growth..."
Volcanic soil, specifically that derived from volcanic ash, can often develop into a desirable loamy texture. Loam is a soil composition that balances sand, silt, and clay particles, providing excellent drainage, aeration, and water retention, which are all vital for plant growth.
Here's why volcanic soil often tends towards a loamy texture:
-
Weathering Process: Over time, volcanic ash weathers and breaks down into various particle sizes. This weathering process contributes to the balanced mix of sand, silt, and clay required for loamy soil.
-
Drainage and Water Retention: The altered volcanic ashes are well-drained while still holding water available to plants. This is a key characteristic of loamy soils.
-
Ease of Tillage: Loamy soils are typically easy to till, and the reference mentions the ease of tilling volcanic soils.
-
Nutrient Content: Volcanic soils are often rich in minerals, contributing to their fertility and suitability for agriculture when combined with the favorable physical properties of loam. This supports growth in pastures and other agricultural applications.
Therefore, while not all volcanic soil is loamy, the specific type of volcanic soil derived from ash frequently develops into a loamy texture, making it highly desirable for agriculture, including pasture, horticulture, and maize cultivation. The dairy industry in New Zealand, for example, benefits significantly from its pastures growing in deep volcanic loams.
