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First time grower having spots on leaves any advice much appreciated

Oh I just noticed some yellowing tips on some leaves does that mean too many nutes? I am watering twice a day with your nute schedule Campesino... appreciate your feedback :)
 
Yeah, mash the stem between your fingers and bend them out of the light, if not your trichs are gonna get burnt off, don't take long either,
Yeah, like Chefbjy said, that might be your problem.
 
Would probably be the best bet. I've found that it's much easier to supercrop when the plant is most hydrated. Dry soil and thirsty plants make it easier to break something. Tie it down the best you can.
 
Super-Cropping

The purpose is to bring colas that are too tall down. As a side benefit it produces a growth hormone response and the Colas fatten and grow. The best time to supercrop is during the third week of 12/12 lighting.

You can bring colas down as little as an inch or as much as 8-10 inches. What determines this is the distance between the supercrop and the tie down. When the plant recovers (within 12 hours) it will wrap around whatever tie down you put in place. The location of the tiedown will determine the new location of the cola.

Process:
  1. Select point for supercrop just above a node with promising growth tip
  2. Select point for tie down and preset soft tie to catch and restrain the cola
  3. Squeeze the supercrop point with the pad of your index finger and the pad of your thumb (do not use your nails)
  4. Seriously squeeze that point, from both directions, as hard as you can. You should feel the plant "Pop" and go soft. It will make you a little sick to your stomach to be hurting your plant by pinching her so hard. Pinch hard - From both sides. It should be soft and pliable when you are done
  5. Gently lower the cola onto the soft-tie support that you have pre-set. Wrap the soft tie around loosely so she is supported and also cannot escape (see pics)
  6. If there is a long span between supercrop and support/restraint, set a bracing soft-tie at the mid point (to hold the mid point up! The plant will really try to curve to escape, often thrusting the midpoint down and increasing the angle of the supercrop. Best to brace against this.
  7. Remember
    1. the plant will curl around the support so the distance between supercrop and support/restraint is what determines how much vertical you are taking off
    2. You can decide where the cola is going to grow. Where ever you set the support will become the new location of the cola
 

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At another note the yellowing tips are also at the middle plant which is more than 40cm (16") away from light- couldn't be light burn there could it?
 

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That is early "nute burn" caused by high EC.
To follow my schedule effectively, you need to measure and adjust for EC. You also need to monitor run-off EC.
I cannot tell you the best way to address the problem without Inflow and run-off EC numbers. You may need to lower inflow EC (dilute the solution), but that might not be the problem at all! The difference between inflow and run-off EC will tell us how to proceed.
 
So I measured EC in at 1150( been on that for last three weeks) and out measured at 1550!i have been watering morning and night with 1150, wondering why the EC is so high again after I flushed 3 weeks ago😲
 
+400 is right on the edge. The first thing I would recommend is increasing frequency to 3x daily. If this is not possible, the second best option is to increase quantity of run-off per event. This just requires additional nutrient solution.
1150 is not too high for inflow, so I would try to avoid lowering inflow and just work on lowering run-off EC by doing one of the above.
 
I don't know about that... Light burn can look like deficiecy or nute burn as well. Light burn may happen slowly over the course of days (or even weeks!) because leaves are dying early instead of immediately. Because of that, light burn may first appear on somewhat older leaves, which can be confusing and make it hard to diagnose.
 
Could very well be but that light is so close I wouldn't doubt it has something to do with yellowing. I thought the same thing about mine but 2 weeks later it was throughout the plant. As you can see it's not just the tips in pic 2. Harder to tell with the yellowlight though.
 
Yes! I am not denying that there may also be light burn ;)

But those tips, and the fact that they are occurring throughout the plant... I am sure that is related to EC. I am even more confident because his run-off EC is +400.

But I think we have a good read on the two issues - and I think they are both issues. Supercropping and adjusting fertigation should help a lot.
 
Yes I agree poor ec combined with light burn no doubt things aren't going to look green until they are resolved resulting in poor yield or herming.
 
Another question please, I was able to move lights up a bit so now about 15" between middle plants and 250w lights. Is that a good distance or will I get away with switching to 400w to hopefully increase bud growth or is the distance to short then for that heat,what's your opinion?
 
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