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-	Phosphorus is a highly reactive element, and as such, does not exist in the elemental form in the soil. The majority of P in most soil is in essentially insoluble forms, and unavailable to plants. In fertile soil a significant portion of the total P is in moderately soluble forms, which act as a "ready reserve" to replenish the pool of soluble P as it is depleted by and other organisms.	+	Phosphorus is a highly reactive element, and as such, does not exist in the elemental form in the soil. The majority of P in most soil is in essentially insoluble forms, and unavailable to plants. In fertile soil a significant portion of the total P is in moderately soluble forms, which act as a "ready reserve" to replenish the pool of soluble P as it is depleted by plant growth and other organisms.