Please help identify this problem

[stealthScrog]

Soil

How long has this problem been going on? About 4 weeks, getting worse.
Are you growing in a PVC grow tent? No.
What system are you running? Soil
What STRAIN are you growing? Super Silver Haze
What was the establishing technique? (Were the seed or clone?) Clones, kinda iffy on the source though
What is the age of your plants? 2 weeks flower, 5 weeks total.
How long have they been in there mixture they are in now?(coco,soiless etc..) 5 Weeks.
How tall are the plants? No taller than 18" due to SCROG, so about 20" if the plant was straight.
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Flower
What Technique are you using? Scrog
What substrate/medium are you using?(Hydroton, RockWool etc.) FoxFarm Ocean Soil
What is the Water temperature? n/a
What color are your roots? White? Brown? Are your roots slimy? White
What Nutrient's are you using?(If growing soiless) Botanicare Soil Bloom (1-5-4).
How much of each nutrient are you using with how much water? Bottle says to use 1/2 ounce per gallon, so I'm using a few milliliters less than that.
How often are you feeding? (If using soiless) Once evey 10 ten days
How often are you giving nutrients? (If using soiless) Once evey 10 ten days
If flowering, when did you switch over to using Bloom nutrients? 1 week into flower
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
What is the TDS/EC/PPM you are using? Don't know. I use a little less than what the bottle says.
What is the pH of the "Tank"? water is between 5.5 and 6.5
Are you sure your calibration is correct on your equiptment? yes- GH pH test kit
When was your last watering? yesterday
What is your water temps? 62F
When was your last feeding change? (ie. grow-bloom-micro-additional) NA
How often do you clean your system: example: Flush out water replace with clean water and nutrients? I did it two weeks into Veg, then one week later right before flowering.
What size bulb are you using? 250 HPS lights a 2x3 box.
What is the distance to the canopy? 11", but have a cooltube
What is your RH Factor(Relative Humidity)? 50%
What is the canopy temperature? 73F
What is the Day/Night Temp? (Include flucutaion range) 76 high, 67 low
What is the current Air Flow? (cfm etc.) 170 CFM
Tell us about your ventilation, intake exhaust and when its running and not running ? passive intake, 170 CFM can pulling through carbon, then blowing over the HPS transformer, then through the cool tube, then exhausted outside. There is a 37 CFM computer fan blowing across the tops of the plants
Is the fan blowing directly at plants? No
Is your water HARD or SOFT? No
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Distilled
Are you using water from a water softener? No
Has plant been recently pruned, cloned off of or pinched No
Have any pest chemicals been used? If so, What and When? No
Are plant's infected with pest's? No

Ok, this has been going on for about a month and it's getting worse. I'm 2 weeks into flowering, and that's what the pics show. After the clones were 2 weeks old (5 now), they were yellowing so I flushed the FoxFarm soil with Distilled water. 2 days later I fed 1/2 Miracle Grow (24-8-16) to them and foliar fed Epsom Salts at 1/2 tsp per gallon. Then at week 3, when I induced flowering, I flushed again. Since then I have fed one time with Botanicare Bloom Soil mix (1-5-4), mixed at a little less than what the bottle called for.

It looks like nute burn but I've flushed the soil twice! I've put so much $$ into this and I'd hate to lose my crop. Thank you!!!

http://www.icmag.com/ic/images/attach/jpg.gif
http://www.icmag.com/ic/images/attach/jpg.gif
http://www.icmag.com/ic/images/attach/jpg.gif

 

[Pirate138]

From the burnt tips maybe its over ferts or hot soil? Just my amateur guess. Good Luck.

 

[stealthScrog]

Forgot to mention that these leaves are from the MIDDLE of the plant. The tops look excellent and the bottoms are 90% good.

 

[MickTheBrag]

you need a fan blowing on the tops of the plants. from the side like the wind does in outdoor conditions.
your plants are suffering a bit of heatsress. peace mick

 

[theHIGHlander]

did thay leafs look like that b4 the flush yeh ??
have you got a pic of the full plant?...if new growth and surrounding leafs/plant looks ok i wouldnt worry to much bro...(but keep a close eye on it )....

keep it green
highlander

 

[stealthScrog]

thanks for your input!

Mick...they are 11" from a cooltube with a fan blowing across the tops of the plants. The temp at the top of the plants is 76 tops, so it can't be the heat.

Highlander...they've looked like this before AND after flushes. I've seen a few posts that say FoxFarm Ocean Forest is on the hot side, and I guess I believe it. As for the rest of the plant, I'd say 80% of the leaves have yellow tips (after flushing). The pics I showed were the worst, where the whole leaves are affected. About 30% of all middle leaves look like the pics.

 

[greenisgold]

That looks like a ph problem, what is the ph of the water/nutes going in?

 

[MickTheBrag]

its just a bit of heatstress man. but keep on to it and hope it dont get worse.

other than that your grow looks fine man. no worries

 

[stealthScrog]

pH is somewhere around 6. I don't know for sure because all I have is the Gen Hydro pH test drops, and the color code looks like it could be somewhere between 5.5 and 6.5

 

[gdup]

Looks like a PH problem to me. Make sure you are checking the PH in the right lighting. If you check it under your grow lights the color will be off. You should be able to see a clear difference between orange for 5.5 and yellow for 6.0. I use the GH drops and GH Ph down, I aim for orange and let it slide up to gold and then drop it back down. Have you tested your tap water to see what the ppms are? Distilled water really lacks alot of natural minerals and is costly.