| | Re: Why is volcanic soil so good for farming?
It is because volcanic soils are very fertile when they have had the chance to weather and start to break down and release their nutrients.
Apart from water and carbon dioxide, plants need three essential nutrients to grow: nitrogen, potassium and phosphorous. They also need some iron to create chlorophyll, which primary function is to absorb sunlight for photosynthesis to occur within the plant. A process which is possible in the presence of radiant energy (light) where carbon dioxide and water are converted into oxygen and organic materials that can be used within the plant.
Furthermore, volcanic soil can also supply in small quantities a number of trace elements that may be scarce, but are very important and necessary to allow plants to make the right proteins and other molecules necessary for life