yea but look at his pix, that soil is not normal.... looks dry to.. you can really tell by the picture next to the yellow plants, that plant has some good soil it looks like. But i really do think it might be salt build up and its locking out the nutes.
Right. The "soil" media the plant is in most likely has the needed nutrients there, just in an inaccessible form caused by a pH issue or competing sodium salts.