Green Soil fertilizer is derived from Green Soil Solution, a patented technology that mines nitrogen, phosphate, magnesium, sulfur and calcium along with all the trace elements, in a pure crystal granule. Green Soil is 1% water soluble and releases only in response to plants roots citrate acid. As the roots produce citrate acid, Green Soil will release nutrients that will feed plants on demand. If the plant demand decreases, nutrients released by Green Soil will be less. By providing a more consistent feeding, Green Soil increases fertilizer efficiency and minimizes nutrient loss.