I have now read the link on Vitamins for Vegetables. I don’t know what the writer means by B100. I don’t know if A and E are improved by dissolving them in boiling water. I think there may be water soluble forms of one or both of them.
Next I am going to pursue the information I found in Qiviut’s comment #23 whick mentioned pig lard containing Vitamin D. There are interesting implications in that statement. Are people suffering results of Vitamin D deficiency because we seldom use lard in cooking any more? Is Vitamin D in all pig lard, or only some and is it also in beef lard? Is D also in bacon fat which I like to use for frying? Stay tuned.
I only see fish oils and marg. as major sources providing Vitamin D, but fish oil (vs. emulsion) is not recommended for garden soil.