Brown spotting… can someone help?!

[aaronweiner2016]

Can anyone help me figure out what this is and how to fix it?

 

[SofaKingHigh]

Possibly cal mag deficiency but really need more information. What are you growing in? What are your watering practices? What light are you using? Nutrients? More information will help us.

 

[aaronweiner2016]

@SofaKingHigh i am growing in an 80/20 coco coir/perlite mix. They are all in 3 gallon containers. Just upped the nutrients to 18 ml per gallo. Pure blend pro. 10 ml of liquid karma per gallon. And 6 ml of cal mag per gallon, I had and 800 watt led on one side of my 8x4 tent raised to the top of my tent. Was hitting 26k lux on top of canopy with that and on the right side of tent was a 640 watt led that was hitting 42k lux at top of canopy. Thinking it could be light burn possibly because a lot of leaves were standing almost straight up. Changed for the moment to one 640 watt at top of tent for all the plants to give them a rest till I figure out new situation. Giving my plants enough water but they have been getting about 25% runoff which is a little high. I water nightly. EC been reading before watering at 2.3 ish and the ph of the water in and out have been at 6.1 ish… this is my first grow ever so lmk if you can think of any thing to help!

 

[ezenzyme]

Did you buffer you coir?

 

[aaronweiner2016]

No I did not buffer but they have been in they’re pot for almost 2 weeks… prior to that they were in one gallon pots

 

[ezenzyme]

Using tap water?

 

[aaronweiner2016]

Yea but my water hardness is very fresh and very clean. In Columbia gorge so it’s coming from snow melt off mountains

 

[aaronweiner2016]

Water hardness is very soft*

 

[bigbagofbuds]

Those last 2 photos look like calcium deficiency to me since it looks like its only affecting the tips of the leaves exposed to light.

Hard to say if more calmag is the answer though, you need to keep a nutrient balance with calcium, magnesium, and potassium, which can be easily thrown off with more calmag (Ive done this in the past). When I had this issue (I still do get it if I dont balance my feeds) I fixed it by adding 1g/gallon of calcium nitrate to boost the calcium without increasing magnesium.

That being said this could also be an iron toxicity (calmag often includes a lot of iron) and if it is then adding more calmag can make it worse (this is what happened to me when I attempted to fix my problem with more calmag).

 

[aaronweiner2016]

@bigbagofbuds it seems to of been an arising problem after I upped my nutrients… especially the cal mag. Any ideas as too my next approach? Or just maybe start by decreasing the cal mag?

 

[bigbagofbuds]

@bigbagofbuds it seems to of been an arising problem after I upped my nutrients… especially the cal mag. Any ideas as too my next approach? Or just maybe start by decreasing the cal mag?

How do the lower leaves look? Any signs of nutrient problems? If is iron toxicity you will likely see some other nutrient issues on the lower leaves. I would say lower your calmag back to 5ml/Gallon and see if the issue progresses since you mention recently increasing feeds. I would also see if anyone else has some $0.02 to share, my experience with iron toxicity was caught too late and so it was severe, I dont know if it usually starts on the leaf tips or the petiole. Half of me still thinks it may be calcium deficiency but thats how I got into the iron toxicity situation hahaha.

What levels of iron are in your fertilizers? I was using green planet massive bloom and medi one along side calmag and they all had iron which is why I had problems. If your fertilizers dont all contain iron I would lean towards calcium deficiency.

 

[SofaKingHigh]

What is your ec of your run off? Also could be a ph issue causing a lockout. If the ec of run off is higher than it may have been over fed.

 

[aaronweiner2016]

@SofaKingHigh my ph of runoff is 6.0.

 

[SofaKingHigh]

@Aqua Man will know better than me.

 

[Aqua Man]

Lights way to intense, looks like humidity maybe low and if you ppm or ph are an issue then you need to feed more often.

The main thing is you lights pushing the plants to hard and they can't keep up to demands.

 

[aaronweiner2016]

I drastically lowered the light intensity, gonna try and get top of canopy down to 20k.

 

[aaronweiner2016]

@Aqua Man

 

[aaronweiner2016]

My ppm and ph are right where they need to be as well

 

[Aqua Man]

I drastically lowered the light intensity, gonna try and get top of canopy down to 20k.

Yeah 25-30k should close to max you out for now. 25k is a good safe bet until they recover.