Is this light burn?

[RollX]

I am hoping that this is "just" light burn and not something even more serious. I have moved the light up a few inches since then but it's not getting any better. So give it to me straight. What is this and how bad have I screwed up?

[Campesino]

Hi RollX
Tough to say based on that picture, but maybe.
Tell us more about your lights: what kind and how close were they.
Also info on medium, nutes, pH, watering strategy, etc.
If you have more pictures, that would also help.

[RollX]

Ok Campesino .
I am running a 400 watt hps cool tube and I was keeping it about 18 inches above the plants but I have since moved it to 20. I also moved both plants farther from the center of the bulb. I have both plants in 5 gallon grow bags filled with cyco coco pearl (coco & perlite). My nutrients are General hydroponics flora trio just the base with no additives. I have followed Nebula's recipe exactly as far as strength at a pH of 6.0. I run plain water through every other feeding and it also is at a pH of 6.0. My runoff tests 6.0. I have ordered a TDS meter but it's not here yet so I have no idea the ppm. I don't have another picture without the light on, but perhaps I can take one tonight

[GreenhouseEffect]

Ya, tough to say, maybe.
Looks like some spots might have gotten a little warm, a few spots with some leaf curling.

[RollX]

Now I'm thinking it could be an iron deficiency. I'm doing a flush just to be safe.

[Potted]

Hi Rollx, I’m asking this only because it’s not mentioned do u have any fans going in grow space? How about exaust,or intake? Fill in the blanks please tent or closet what’s the lights on temp.and humidity? Just trying to make a correct diagnosis any cal mag added and what’s your light schedule? Lol

[RollX]

Hi Potted. Yes I have a fan blowing between the two grow bags. I have a desk fan mounted high in the corner of my 2×4×5 grow tent. I keep 3 vents open on the bottom of the grow tent. I have a 440 cfm exhaust fan that pulls the air out of the space. I keep the temps in the mid 70s during 'daytime' and mid 60's at night. My humidity ranges from 50-55% at all times. Before the plants were making pistols, the lights were on 24/0. They have been on 18/4 since. I have been feeding, allowing the medium to dry, and adding pHed water, allowing that to dry and it has been about 2 days between these. Should I be feeding nutrients daily?

[Campesino]

I water daily in Coco, and you can too! Since you have Perlite mixed in, you don't need to let it get dry at all.
I water 2 days with nutes and then one day with just CalMag. Regardless of anything else, you should always have CalMag in your water both nutes and non-nute waters.

[Campesino]

Also, CalMag should be added to water first. Before Micro.

After looking at the pics again, I think that increasing water may solve a lot of the issues and produce significantly faster growth. Making sure it always has CalMag should help too.

[RollX]

Campesino my plants have just started this problem and also they have just started really making pistols. I didn't know I was supposed to feed more often. I think this is most likely the problem. Is once a day enough or should I feed more? Thank you for your help, I think this will likely help

[RollX]

I forgot to mention calimagic. I been putting it in last. Is that wrong too?

[Campesino]

It doesn't seem to make a tremendous difference, but it should be added first. Check out the comment on the left of this GH feedchart: http://gh.growgh.com/docs/Feedcharts...TW_03216am.pdf

"When using Armor Si and/or CALiMAGic, with Flora Series, these products should be added prior to adding FloraMicro"

[Campesino]

I always give one big water per day. To saturation on days with nutes and to 20% run-off on CalMag days. Late in Flowering they increase water use and I will notice the very top of the coco gets dry by the end of the light cycle. When this happens I give them a supplemental watering before putting them to sleep (Usually just 1/2 as much as during their normal watering). My philosophy is to never let the top of my coco get dry. For most of the grow one watering per day suffices.
In terms of "Feeding", I recommend at least every third day/watering be without nutrients.
I put together my own nutrient schedule that I am following on my current grow. It is below FYI

[RollX]

Hey thanks a ton man! I'm gonna feed my calimagic and base nutrients on your schedule. Thank you for taking the time to help me.

[RollX]

Here's an updated picture. It seems like they're a little better. My TDS meter came in so I have also been able to moniter the concentration of nutes in my water and runoff. Today, I had a higher ppm in my runoff so I leached some pH' d water thru until the runoff ppm was slightly lower than the nute water. Next feeding I'll go back to nutes, slowly adding and checking runoff until they are close.

[Campesino]

They are looking a little better! Keep us posted!