Ewest, did you read the paragraph on using "gley" to seal pond bottoms? I doubt you'd ever need to fertilize again after that!
IF I was from Texas I would have something to say about this Okie pond-sealing method, but us Ahians only pick on West Virginians and Michiganders. :p
In all seriousness, I speculate the gley method might be used for livestock watering tanks where the soil itself was porous.