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the central valley likely has some of the best soil on the planet. it is a valley between the sierras, ancient mountains, and the pacific range, which are very new mountains that have recently pushed up out of the ocean

when it rains, sediment from both ranges settles in what used to be a flood plain. over the time, this combination has created an incredibly fertile soil

soo, naturalich, that wasn't good enough, so for marginally more yield use of fertilizer that raises soil salinity started