Help Please!!!!!! I need a Diagnosis on my leaves and feed back on lights

[Sman2012]

Hi I need help!!! I have been doing this for a few years but since I started using Dutch Pro food Two grows ago) I started to notice brown spots on my leaves, nothing major and normally towards the end of the cycle. But this time round they have been there from the start of Veg and obviously have got worst. So let me tell you a little about my set up:
I have a 2.4m x 1.2m tent with a 10ich box fan and filter, prime air fan controller and 3 clip on fans, I bought these new lights 2x Gavita pro 1000W, I was told they are the best on the market.
In the tent I have 12 blue chesse plants in soil in 11ltr pots using Dutch Pro veg and flower food and PH. I grew them to approx 12ichs before turning them to Flower. (I normally go to 18ich but I had to turn early because of a dead line).
I am in my last week and am now starting to flush, my babies are approx 2ft tall and the lights are 2ft away from them.
For veg I kept the lights on 600W, then from flower I turned them up one setting a week untill 1000W then the last two weeks I put them on their max which is 1150W. (But I had to turn that down to 825W this week because it is too hot)
Now I know Ive had some heat problems that's why I didn't get as big buds as I normally get.
My EC was 1.8 - 2.0 flashing, my run off was 2.0 - 2.2 flashing, PH is 6.2 and humidity 35% (when lights are on)
I would like to know what that is on my leaves?
How to get rid of it if I get them again? And how to NOT to get it again?
Id also like to hear from anyone who has used these lights and to find out how you rate them and how you got on? I found them really good at 1st but then they got really hot when they were on 1000W - 1150W the temperature was getting between 30c - 35c which is way to hot! If kept them on 825W I could get the temperature down to 26c - 30c. My light set up before was 2x 600W Awings MH bulbs for veg and HPS for flower then I would drop a 400W DS bulb with Euro shade in the middle at the start of week 5 flowering. (My average crop from this set up is 30 - 35oz dried (Bone) always using 12 plants, flowering at 18ichs) I was told that 2x Gavita pro 1000W would be better than this and better my yield. Now they cost me £500 each and I cant tell by this crop if they were worth it because of the problems I had. So I'm going to have to wait until near Christmas time when I start to run low and I have to start my new one to really see if they are worth it or if I should sell them and go back to my old set up

I will be looking forward to hearing feed back from everyone and once Ive chopped this one down next week ill let you know how much I got and what it smokes like

 

[nick17gar]

well its hard to tell with your lighting on, best to take pics under a regular light, so everythings not tinted yellow.

either way, severe phosphorus deficiency, moderate magnesium/calcium deficiency. up the nutes dude. but if your close to harvesting, its too late now.

theres also plenty of articles on here that show this exact problem, i know becuase ive written a few. https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html

 

[luimc559]

I agree, picture 4 looks a lot more like a deficiency than an overdose, you could try this product called "super Thrive" its a shit load of vitamins and minerals and has hormones that I think aid in plant stress. I started using it this grow and I've notice my plants are growing with much more vigour. It's cheap $7 and I've seen it everywhere; Lowes, Home Depo, Orchard Supply. But I got it at my local hydro shop. Hope this helps.

 

[GreenChile]

I think thats boron.
33c is WAYYY too hot bruh. Plants stop growing at 31-32c. Your temps need to be like 24c.
Your def isnt really that big of a deal tho, and its likely not affecting your harvest, but next time add some AZOMITE to your mix to rid this.

 

[t2kallday]

That is overfert for sure! 1800 to 2000 ppm is insane bro i feed at 1000ppm or 1.0 ec at peak flowering... mabye! as long as your bringing in fresh air and keeping your temps below 80 f or 30 c ull be fine. Lower your ec and youll be fine. Your plants look decent and youll probably harvest a good amount.Id say flush now till finish

 

[lagarrettBLUNT]

View attachment 2141225 check it out since you can see your ladies in person judge for yourself what it might be then solve it.

 

[t2kallday]

That is overfert for sure! 1800 to 2000 ppm is insane bro i feed at 1000ppm or 1.0 ec at peak flowering... mabye!Try to start with low feeding regimens cuz its way easier to give a plant food when it hungry, then it is to make it puke/flush it out after uve force fed it! lol as long as your bringing in fresh air and keeping your temps below 30 c ull be fine. Lower your ec, use products like hygrozyme to help breakdown nutrients and clean your organic medium,and add lots of life to the soil like fingi and bacteria .After you do that add carbs to the soil to feed those fungi and bacteria, and watch your ladies explode and take all the nutes u can give em cuz the rootmass is as thick as the pot its in! Your plants look decent and youll probably harvest a good amount.Id say flush now till finish

 

[lagarrettBLUNT]

That is overfert for sure! 1800 to 2000 ppm is insane bro i feed at 1000ppm or 1.0 ec at peak flowering... mabye!Try to start with low feeding regimens cuz its way easier to give a plant food when it hungry, then it is to make it puke/flush it out after uve force fed it! lol as long as your bringing in fresh air and keeping your temps below 30 c ull be fine. Lower your ec, use products like hygrozyme to help breakdown nutrients and clean your organic medium,and add lots of life to the soil like fingi and bacteria .After you do that add carbs to the soil to feed those fungi and bacteria, and watch your ladies explode and take all the nutes u can give em cuz the rootmass is as thick as the pot its in! Your plants look decent and youll probably harvest a good amount.Id say flush now till finish

just seen that your right. hes on flush anyways so like these guys said its kinda a non-issue as long as it lives a couple more days lol

 

[DR. RESINTHUMB]

too much food and not enough airflow

 

[Sman2012]

here are some better pics.

 

[budleydoright]

What is the temp at the canopy and how close are your gavitas? 1k's are WAY hotter than 600's. You increased your lighting by almost 50%, expect that much more heat. High heat, ton's of light and low humidity will cause your plants to transpire lots of water, which would require a much lower concentration of nutrients in many cases.

 

[Sman2012]

Thank you everyone for your input much appreciated

 

[lahadaextranjera]

Your thermometer should be level with the canopy for an accurate reading

 

[Sman2012]

The lights are 2ft away! If i leave them on 825W it is 25c to 28c but when i put it on 1000W or 1150W it goes to 30c to 35c

 

[t2kallday]

if you can get air cooled reflectors and duct the light(s) completely seperate from the rest tor your growspace this will bring temps down at least 5 degrees! which is a ton in temps! I have my 1000 watt 6 inch cooltube witth 440cfm fan sucking cool air in from my bathroom(nextdoor to my growspace)and exausted into the attic, i had to go in the attic cut holes etc...but its well worth it. This way the only air i have to cool is in the space itself. i keep a 1000 watter and four 23 watt 5000k cfls in a 5 by 5 tent and temp stay 76 77 in az!

 

[ShellShocked]

I'm having this exact problem right now! i see this thread is pretty old, but if you see this reply did you ever get an official diagnosis? did you fix? P deficiency? these lights are intense. maybe feed feed feed? or was it feeding too much?

 

[budleydoright]

1000 watt lights should be 36" away from the canopy and often higher if multiple fixtures are in use and during periods of rapid growth. We use 1000's to cover more area per bulb not to try and force feed our plants more light than they require.