What is wrong with these?

[JD6]

Both autos 44 days from seed.
2nd grow so still new to this.

 

[TheGoldenRoad]

What lights are you using and how far are they from the plant? It doesn't look like you have much of the same problem on the lower branches, correct?

 

[JD6]

They say 1000 W bulbs, set at about 65%
12 inches away, on 18 off 6.
Correct, all the problem parts are around the middle, making it more confusing.
If you check my post from yesterday there's more info there but nobody replied.

 

[JD6]

What lights are you using and how far are they from the plant? It doesn't look like you have much of the same problem on the lower branches, correct?

This is the kit.

 

[TheGoldenRoad]

From what I'm seeing some of those tips look a little bleached. Nute burn usually starts on the lowers and moves upwards so I would try to raise your light(s) a few inches but that's just my two pennies.

 

[Galgrows]

You know i thought the same thing they looked bleached not good at all. Too close to tops of plants.

 

[Beachbumm]

 

[LoveGrowingIt]

Leaf tips are an excellent indicator of the health of a plant, but they're only a warning. There can be multiple causes. My thinking is that there may be multiple problems here.

Excess or deficient P can show as necrotic leaf tips. What are the media and nutrients?

Another possible cause of leaf tip necrosis is too high a VPD, so it would help to know the temperature and humidity.

I think light burn is unlikely, but it might help to reduce the light intensity for a while.

I believe I see some chlorosis between the veins, which could be Mg deficiency, which is also related to light intensity.

 

[JD6]

From what I'm seeing some of those tips look a little bleached. Nute burn usually starts on the lowers and moves upwards so I would try to raise your light(s) a few inches but that's just my two pennies.

Thanks. I'll try raising it a bit
Do you recommend lowering the intensity too, or not?

 

[JD6]

You know i thought the same thing they looked bleached not good at all. Too close to tops of plants.

I'm going to try raising the light.
Why is it the mid leaves and not the top if that is the issue?

 

[TheGoldenRoad]

Do you recommend lowering the intensity too, or not?

I would keep the intensity where it is but raise the lights a bit. At the very least it will reduce the chances of further damage from lighting if that is indeed the case.

 

[JD6]

Leaf tips are an excellent indicator of the health of a plant, but they're only a warning. There can be multiple causes. My thinking is that there may be multiple problems here.

Excess or deficient P can show as necrotic leaf tips. What are the media and nutrients?

Another possible cause of leaf tip necrosis is too high a VPD, so it would help to know the temperature and humidity.

I think light burn is unlikely, but it might help to reduce the light intensity for a while.

I believe I see some chlorosis between the veins, which could be Mg deficiency, which is also related to light intensity.

Copied from my previous more detailed post that didn't get any replies -
pics one, six and eight are an indica auto.
The others are a sativa.
Both day 43 from seed.

What's wrong with them?

Tomato compost (nothing better available) not feeding due to nues in the soil and I fed about 3 weeks ago and that's when the problems started.
Watering when necessary.
Light 18 on 6 off, 12" from the plant.
Temp 20 to 24°c (think that's around 72f). Was a few degrees warmer until recently when the outside temp dropped.
Humidity has gone a bit higher recently, unsure why, between 50 to high 60%
Last watered about 14 hours ago.
Fans on 24/7.

This is only my 2nd try at this, last try was pretty disappointing.

Thanks.

I asked someone more knowledgeable than myself about trying cal mag and they said no, it would be too hot.
What's your opinion?

I'm going to raise the light as most have suggested.

The PH is very alkaline, I don't know what to do about that if it's an issue.

Thanks

 

[JD6]

*adding more info as I can't edit the post*

Pics one, six and eight are an indica auto.
The others are a sativa.
Both day 44 from seed.


Tomato compost (nothing better available) not feeding due to nues in the soil and I fed about 3 weeks ago and that's when the problems started.
Watering when necessary.
Light 18 on 6 off, 12" from the plant.
Temp 20 to 24°c (think that's around 72f). Was a few degrees warmer until recently when the outside temp dropped.
Humidity has gone a bit higher recently, unsure why, between 50 to high 60%
Last watered about 14 hours ago.
Fans on 24/7

 

[JD6]

I would keep the intensity where it is but raise the lights a bit. At the very least it will reduce the chances of further damage from lighting if that is indeed the case.

Thanks, I'll do that.

 

[JD6]

I would keep the intensity where it is but raise the lights a bit. At the very least it will reduce the chances of further damage from lighting if that is indeed the case.

Also did you notice the droop of the leaves on the indica?
Is that light related too or something else?

 

[TheGoldenRoad]

Also did you notice the droop of the leaves on the indica?
Is that light related too or something else?

That could be from multiple things but more often than not it's caused by under or over watering.

 

[Phyto]

They say 1000 W bulbs, set at about 65%
12 inches away, on 18 off 6.
Correct, all the problem parts are around the middle, making it more confusing.
If you check my post from yesterday there's more info there but nobody replied.

Those are 1000 watt equivalent! They actually draw about 100 watts, it would be difficult to burn a plant with those lights unless they’re very close to the plant. If anything given the spacing between the nodes, it needed more light early on, not less. PH may be your issue if you’re using synthetic nutes. What are you feeding? There are many PH down products, you can use lemon juice in a pinch, but it’s not optimal. Do you have a ph pen? You’ll need one.

 

[Beachbumm]

The PH is very alkaline, I don't know what to do about that if it's an issue.

Define "very" & yes, it could well be the cause.

 

[JD6]

Define "very" & yes, it could well be the cause.

 

[JD6]

Those are 1000 watt equivalent! They actually draw about 100 watts, it would be difficult to burn a plant with those lights unless they’re very close to the plant. If anything given the spacing between the nodes, it needed more light early on, not less. PH may be your issue if you’re using synthetic nutes. What are you feeding? There are many PH down products, you can use lemon juice in a pinch, but it’s not optimal. Do you have a ph pen? You’ll need one.

I'm not feeding now due to nutes in the tomato compost but this is the food I use, I tried feeding half of the strength recommended a few weeks ago and that seemed to be when the problems started.