Foliage testing in cannabis revealed calcium is more important (being higher in content) than nitrogen and potassium combined, (plants provide optimal nutrition to the newest growth, so the new growth is what's tested).
Sulfur contributes more to flavor and taste than any other element.
In nature (soil), plants get the same NPK from start to finish, right?. This is one reason why some have such great success using Foliage Pro from start to finish.
Dyna Gro has developed a process to combine essential elements in one solution, other manufacturers have not been able to figure out how to do this, (even after trying to reverse engineer Dyna Gro) so that requires you buy 2 or 3 products to get the same nutrients as in a one part, combined Dyna Gro.
Liebig's law "states that
growth is controlled not by the total amount of
resources available, but by the scarcest resource (
limiting factor)." So that means any plant will only utilize (at a proportionate level) the scarcest nutrient available. That is why disproportionate feeding is wasteful. Many of the hyped nutrients are not necessary or do not get utilized by the plant because they create a disproportionate feed. (Why balance is more important than quantity)
Read summary here:
http://en.wikipedia.org/wiki/Liebig's_law_of_the_minimum
Over feeding is why flushing is needed in most cases, plants being fed the proper ratio and ppm of nutrients should not require it. (Why low ppm grows can be so successful)
But most of these aren't my words, they are from Dyna Gro's founder David Neal himself, been doing this a loooong time. Listen here:
A great 30 minute interview from the CEO of Dyna Gro himself. Is he plugging the product? You be the judge. Read the comments and see the progress from growers here and compare to what he says, seems in line to me.