Problems with leaves during bloom stage

[paulh]

The leaves on my plant just recently began getting brown tips and it progressively affects the entire leaf. The plant is in the 3rd week of bloom. I never use full doses of the nutrients, usually only half. Any suggestions on getting this back so I can get a good harvest?

[OldManGrower]

Light Burn. Lower your intensity or raise the light.

[paulh]

Thanks, the light is the highest I can get it, I'll try lowering the intensity

[Lizard]

What lamp do you use and what was the distance between plant and lamp and what setting was it on. what PPFD do you have? Looks like more than light stress with those lower leaves going too.

[paulh]

I have a Spider Farmer SF2000, the tops of the plants are 18 inches from the light. I originally had it set to 100% but now it's lowered to 50%.

[Lizard]

What are you feeding and how much? What do you PH to? what PH is your runoff?

[Lizard]

According to your PPFD chart at 18" your at 862 PPFD, at 100% could cause burn at the top of the plant but not as far down as I'm seeing. I'm thinking either to much water at one time or a PH problem. You mentioned you only give half a dose of nutrients, once in bloom they should be getting all they need.

[paulh]

I'm really careful about over watering, my ph is 6. i really don't get that much run off. I put in about 1/2 gallon when I water.

[Lizard]

Sounds like you have no PH meter, that's ok. Get a cheap one at least and test your nutrient solution to see where it is. If your in soil you want 6.8 approx. it will give you runoff at about 6.5 your target. I assume your feeding a bloom solution of one kind or another. Most of those solutions will be low in PH, so take that into consideration.

[Lizard]

I'm really careful about over watering, my ph is 6. i really don't get that much run off. I put in about 1/2 gallon when I water.

That's it too low, go to 6.8. your runoff is probably 5.8 or so not good.

[paulh]

I use test strips to measure. I have a Sonkir 3 in 1 but I don't think the pH meter is very accurate, Here is my plant a month ago before bloom, never did any adjustments to the ph

[Allenpro]

So that looks great, what changed?
Looks like you did a heavy defol before the flip, I do that at the flip and then 21 days after that

[Lizard]

I use test strips to measure. I have a Sonkir 3 in 1 but I don't think the pH meter is very accurate, Here is my plant a month ago before bloom, never did any adjustments to the ph

They look ok there. Some veg solutions bring you too a reasonable PH but at 6 for blooming is too low. And out of curiosity why do you defoliate that much?

[Lizard]

You'll be ok get a PH tester with a replaceable prob if possible and start testing. It will be a few till your runoff is at 6.5 but you will see results. At 3 weeks bloom you beat me usually decent popcorn.

[paulh]

Thanks I appreciate the help

[Allenpro]

I have one of those lights and the only way you could get light burn is if the feed is too low ant its touching the p[lant
Looks like something is blocking the N from the plant or your not giving it enough so its pulling it from the leaves.

[Bluey]

I agree. This light doesnt burn. Have 2 here.

So start with the basics.

pH first. If in soil and you've been giving it at 6.0 go up to 7.0 now for the next feed then 6.8 then 6.5 and back up and to 6.8. Maintain 6.5 to 6.8. Vary it

Nutes. Tell us what you are using, how much (EC preferably), in what sort of water.

Temps, RH% and air movement.

Given your problem is coming on soon after flip, how you are managing that and the nute transition may be a factor