The existence of bad citations does not get away with the need for good citations, though. Why haven't you fixed the tungsten thing, though? This seems like an obvious mistake.
As for fixing errors on wikipedia myself? I gave up on that years ago when I tried to fix a few mispellings and had my changes reverted by bots within a minute.
[1] https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_0...
[2] https://www.gov.mb.ca/agriculture/environment/nutrient-manag...