Pineapple Chunk SCROG; Larger leaves dying, veines/ tips brown

Specs:
Strain: Pineapple chunk (approx. 45 days old)
Soil: Part humus, part Kellogs organic mix, part perlite (not sure of exact ratio; no nutes)
1000w HPS; Hortilux bulb - 17-18" above the tops
Grow tent: 5x5x7 (approx)
Nutes: Began w/ Miracle grow 10-10-10 (problems ensued)
Switched to Grow X Nutrients (hydro guy claimed it was FloraNova equivalent) fed w/ 10ml per gal once, 20ml per gal a second time.
Water: tap water with approx 7.0 ph


Problem:
As far as I can tell it's a defficiency. The fan leaves near the bottom of the plant got these brown spots on them and eventually yellowed and died. At first it only affected the big fan leaves. Now it has progressed towards the top affecting smaller and smaller leaves. The tops still seem healthy, but I fear it's only a matter of time before they're affected as well. I just read on my new nutrients that micro nutrients should be added for optimal results. So I will be buying those asap. I also have 2 jugs of water sitting to allow the chlorine to evaporate in case this is a ph issue.

Here's some pix:


I've never had a grow go this poorly and I'm wondering if Chunk is just a picky strain.
I've used miracle grow (for veg) and this very same tap water before without a problem. I've also used Flora Nova in the past with excellent results. Anyway, I just thought I'd get ya'lls opinion on the matter. Let me no if you have any questions. Thanks for stopping by!
-Highnotlow

calcium, magnesium and fertilizer burn.

hnl,
Just a few ideas to keep the ball rolling. You started with a fairly rich organic soil...though some dolomite and a ph check before starting the grow would have been nice. So I think it's multiple deficiencies from a nutrient toxicity/build up. Were you feeding near full strength and with every watering?

Do you have any idea as to water quality? You could be dealing with a really hard water issue. And it is true that some strains are more sensitive then others...I doubt that many strains would do well under such circumstances.

I rarely suggest a flush...but in this case I see no other clear course of action. Trying to treat deficiencies by adding supplements would surely make things worse. After a good flush...go easy on the nutes and only every other watering...and get a good wet dry cycle going. And take a good look at your water...look up the county/city water quality report online. Look at ice cubes. Cloudy cubes equal hard water.
JD

As posted by me elsewhere Standard nute burn ...flush with air temperate Ph neutral water, 3 times the volume of the pot, allow to recover in dim light 1x day no nutes for 1-2 weeks or until you see an active recovery

Thanks for your speedy replies,
I think I should mention that I did perform a small flush (approx. 4 gal) with tap water before switching to the new nutrients. I added the new nutrients (10ml per gal) and placed her back in the tent immediately after the flush. It's been about a week since then and she's received one watering w/ 20ml per gal X Nutrients. Also, I bought a digital ph tester for soil and it gave a reading of 7.0 at several depths/locations.

So I guess I will still perform the flush. I just had a few questions: She's in a 7 gal. container filled 3/4 of the way, so how much water should I use? Also should I give her a few days to recover after the flush, or put her back in the tent right away? Finally Johndee, you said to ease of the nutrients for a while, does this include micronutrients, or should I give her a light dose of them after the flush?

Also I got some info from my local water company. The amounts are in the 4th column. ND = not detected in water. Make of it what you will:
View attachment 2939138View attachment 2939139

Thanks for all your help!
-Highnotlow

HNL,
Regarding your water...very soft. Hardness rating of under 20 ppm which is as good as some RO water. That brings up another issue which is...does your nutrient provide enough ca and mg for your plant? I know it's miserable to try and figure some of this stuff out. But one clue is if the company markets a "hard water micro" option. That means the regular micro will include the Ca and Mg and you won't need to supplement.

Follow vostoks flushing advice above. Since you have about 5 gallons of soil, that would be a 15 gallon flush. Ignore your previous 4 gallon flush and start from scratch (since you already added more nutes)

Don't add any micro...just wait till you start feeding again. Lots of stored stuff yet in the soil and leaves.

Directions on the nutrient bottles are always high. After the flush, treat it like a recovering sick plant...maybe 1/4 dose and always give a watering between feedings. Then, if plant is doing well, go 1/2 and even after it's fully recovered 3/4 might be the absolute max. Always watch the leaf tips for browning and dying tissue as you are bumping up the nute dose.
JD

Thanks Johndee, will do.

IMO- Calcium, Magnesium deficiency.

Good Luck on Your Grow.