He says she says, it's down to plant nutrition and facts. Go ahead and take a look at laboratory fertilizer analysis of AN's Big Bud..
http://www.oregon.gov/ODA/PEST/docs/pdf/lab_2009_0630.pdf?ga=t
Courtesy of Uncle Ben -...
Exactly
Check this journal: https://www.rollitup.org/grow-journals/341992-first-mj-grow-1200w-hid-11.html#post4561260
DynaGrow and DynaBloom nutrients. Notice how healthy the foliage is. You can't really get much better than that.
Foliage is what is needed during flowering, N supports foliage. Yellowing leaves from the bottom up is a N deficiency. You might want to switch to a fertilizer with a higher N value.