First grow, yellow veins during early flower

Scrog, soil pots, Green Crack, sativa dominant, 50 day flower time: Day 21 flower.

This all may be fine, but I’m a nervous first-timer. It probably started last week, but really didn’t notice till now. A few of the leaves are starting to turn yellow. And not the usual yellow leaves/green veins, nitrogen deficiency type that I read about. These are the other way around, yellow veins/green intraveinal areas slowly turn yellow. The ones affected seem to be larger, lower leaves. New leaves around the buds look fine so far. I’m not having a lot of luck searching the net on the yellow vein peculiarity.

They were fed Liquinox all thru veg and did great (though I’ll go with organic fert next time). Switched to Dr Earth Bud&Bloom 4-10-7 on alternate watering and molasses on all watering after going 12/12, and always monitor PH.

So, did I panic when I flushed them last night out of fear there was some lockout from salts? Should I just go back to dr earth/etc next watering? *If* it’s a nitrogen issue, what to do or too late? Or is this normal?

Thnx! phil

Rock out 18-6 , give it water only for a light week or lightly nute it. and spray it with a foliar that prevents nute burn and all should be fine. it looks like u either have nute burn or a deficiency.

Sativas and sativa doms need less nutes, And excess N can interfere with other nutes

bl4ze:20 said:

Rock out 18-6 , give it water only for a light week or lightly nute it. and spray it with a foliar that prevents nute burn and all should be fine. it looks like u either have nute burn or a deficiency.

Click to expand...

18/6?

Diabolical666 said:

Sativas and sativa doms need less nutes, And excess N can interfere with other nutes

Click to expand...

Yes, all during veg they got 10-10-5 and did great. Started bloom fert at beginning of 12/12 which is 4-10-7, a significant drop in N, so not certain there's been an excess.

18/6 meaning give it 6 hrs of darkness so u can hit it with foliar without burning it.

bl4ze:20 said:

18/6 meaning give it 6 hrs of darkness so u can hit it with foliar without burning it.

Click to expand...

thnx, what kind of foliar would you recommend?

Revive by Advanced nutrients has never done me wrong. Photosynthesis plus is also a rather useful foliar.

in fact you prolly be better off doing 12/12 if thats ur current light schedule (flowering light schedule) and spray it every time it gets dry then give it a couple hours without foliar so it dries up before you turn the light back on.

Yeah, I can work the room in the dark, no prob... thnx, bl4ze

Looks like a magnesium deficiency to me. See: http://www.growweedeasy.com/magnesium-deficiency-cannabis for instructions to correct the problem. Nice grow, btw.

Gramaw49 said:

Looks like a magnesium deficiency to me. See: http://www.growweedeasy.com/magnesium-deficiency-cannabis for instructions to correct the problem. Nice grow, btw.

Click to expand...

Thanks, Gramaw. I think I got it under control with the Revive. It kinda looked like N deficiency or Mag, except that the veins went yellow and it took time for the rest of the leaf to do the same, opposite what all the pics show. The buds and their leaves look fine and I removed a lot of fan leaves now (yes, I know all the controversy on that tactic, didn't overdo it). The only concern I have is that many of the calyxes have developed brown hairs. A friend came in and said they looked like they were ready to harvest, but buds were still on the small side and then remembered they were only in week 4. So I don't know if they got a bit stressed or what. The temp did hit 90 in the room one day (out of my control)...

yes they heat can turn white hairs orange fast, its not ready tho.... when the red hairs start to sink into the buds its ready to harvest

Diabolical666 said:

yes they heat can turn white hairs orange fast, its not ready tho.... when the red hairs start to sink into the buds its ready to harvest

Click to expand...

The hairs don't actually sink into the buds; the buds swell up around the hairs -- but, either way, it is only an indicator that it MIGHT be time to harvest. The only way to know if it's actually time to harvest is to look closely at the color of the trichomes. Most of them should be milky / cloudy, with some of them turning amber (unless you have a strain that suggests otherwise). I've never seen a plant where ALL of the trichomes go milky, but you'll notice a distinct difference when most of them turn.

By the way, the hairs on some strains do turn amber more quickly than other strains, so it may be normal for your plant(s) and not necessarily the heat -- but that much heat isn't good for an inside grow.

Gramaw49 said:

...but that much heat isn't good for an inside grow.

Click to expand...

I know : (
The part I do have familiarity with is when to cut, trichs, clear, milky, amber, percentages of, etc. It's still early, they're crystal clear...