the small bit of yellow most of us have on the newest growth that tends to disappear as the leaf matures
well its been driving me crazy... heard it said that its normal!
had to find out for myself
so I did a little experiment
I took the extra clones from my last batch, the ones id normally throw away and will end up tossing in another week
I set them to grow in bloom and I waited for the yellowing to appear that I usually see the first 2 weeks of flower and later disappears
I sprayed half of them with zince edta and half with iron dtpa
iron with aminos.....over night the entire plant was darker including the yellowing new growth
zinc with aminos..... although it didn't make the impact that the iron made and the yellowing didn't improve the over all look of the plants was happy
which I suspect was a result of the aminos
so im adjusting my iron up a bit more... I may also change my feeding schedule to feed veg nutes for the first 2 weeks of flower.. it is possible the high P in my bloom nutes are affecting iron uptake in early flower but subsiding as the plants need for P increase
so ive dropped my P fractionally
I also seen a tiny few rust colored speckles on the lower fan leaves so im going to bump up my calcium a wee bit also