"Wouldn't it be cool if we didn't have to use poisons to grow our food?"

FYI...

Up to 50% of the total amount of phosphorus in the top layers of soils from the Midwest and other temperate zones is probably bound to humic substances and not available to plants. It must be mineralized before roots can absorb it. Thus, the tendency to apply inorganic phosphorus to agricultural fields. (I think, but I'm not sure, that much of the phosphorus in manure is also not available to plants. Someone will, I'm sure, clarify this matter.)

Fortunately, there are at least two enzymes that can catalyze the release of the phosphorous locked in soil. Furthermore, it would not be difficult to engineer cultivated plants so they secrete a low amount of either enzyme immediately around their roots, making the phosphorus available. This would substantially reduce the need to apply fertilizer containing inorganic phosphporus, reducing the farmer's cost, protecting the environment from excess phosphorus levels, protecting human health, reducing potential hazards from the mining and distribution of phosphorous, and reducing the amount of energy -- and CO2 emissions -- used for moving phosphorus from mines to agricultural land

Unfortunately, environmentalist are preventing us from taking advantage of this technology.

Oh well... nothing like trying to save the world with one hand tied behind you back.