Humans need sodium and a lot of other minerals for our nervous system. Plants do not have nervous system. So while humans and animals have a good way to manage the mineral levels, for example by filtering excess out of the blood stream through the kidneys, plants do not. The plants just leave the excess minerals in the soil. However because of the way plants, fungi and bacteria take up neutrition they can not do this from high mineral soil. So if you put sodium or other salts in your soil then it is going to kill the plants in it.
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