Young leaves yellowing, loss of smell, bud production halted. Week 5 flower.. HELP!!!

I am starting to see this problem develop. the new leaves in on buds are turning yellow, seems like growth is stunted. Loss of crystals and smell. Starting to smell like grass. Only 2 strains are exhibiting this. but a couple more are showing minor changes. Looking on the net it looks mostly like boron. but does anyone have any ideas or info?

Leaves look like they are around normal size. Just the one thing that pointed to boron for me was the bud abortion. Like buds stopped growing and smell is lost along with no more crystal production. I gave a couple good flushes. One with flushing agent to assure removal or any buildup as when I tested my runoff it was higher.

food ppm: 1200 in week 5
under 7 -1k hps
nightime temp: 70-72
daytime temp: 82-84
humidity 50s
do run co2 but at low level 600-800 ppm

I did have two days where I must have hit my timer and lights came on 1.5 hrs early. But it was starting to show symptoms before that.

Oh yeah Im using coco. I have used this brand NF-Nutrifield once before and it drained way too fast and I got this problem before and couldnt figure it out. But it started the last couple week. Im starting to think its this soil. Because I have never encountered this with botanicare coco.

The runoff was 1900ppm. When I give it food of 1200ppm. Was using tap water for first half of grow but have switched to RO. when I was using tap water I had it in a res with airstones to aid in the removal of that chlorine smell and aerate it some.

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synaps

Member
How did it turn out in the end? Ive been having loads of problems with my first indoor, about a week or two ago my lemon kush's started to look ill, yellowing of leaves, firstly just the fans but then it spread to the sugar tips and then some of the buds too :S

I diagnosed it as bud rot, cut off all the offending material, and have been running the fan 24/7, the lovely lemon smells all but gone, but so far no more brown buds, I've been water curing the stems which had rot on them and thats been going good so far (on day 4 so far) I was planning to hang the remaining stuff, but seeing as the smells all but + there are still brown leaves appearing, Im thinking I might just WC the lot.

Im interested to know if thats what happened to ur babies too + if so how did you deal with it?
Hope you managed to make it out the woods man, peas d
 
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