Brown spots on leaves on 1 of 4 plants

[Enthusiasm]

Pictures are of one plant that has started showing brown spots on various parts of its leaves. As you can see in one picture the spots are spontaneously in the center of the leaf.

Strain of Mj?
-Various bagseeds
Hydroponic or soil?
-Soil
From seed or clone?
-From seed
Age of plant in question?
-4 weeks
What stage (Veg/Flower; how many days into)?
-Veg, 4 weeks in. 24/0
Medium (Soil, Rockwool, Hydroton etc.)?
-Unfertilized soil
Container/Pot size?
-2 L
Have they been transplanted, if so how long ago?
-2 weeks
If soil, composition ratios (peat moss, perilite, vermiculite etc.)?
-Don't know specifics as the soil was from the local greenhouse, it's what they use for their plants. But it's about 15% perlite
Water runoff Ph?
-No runoff from the pots, they have holes in the bottom but water rarely runs out of them.
Nutrients added?
-Foxfarms HappyFrog dry ferts. 5-5-5
Ratios of nutrients (N% P% K%)?
-10:10:10
Feeding schedule?
-Replanted 2 weeks ago into current containers which were mixed with ferts for 10:10:10 ratio. Will add more 1 week from now according the fert bag
When were they last fed/watered?
-Watered 2 days ago
How are you determining when to feed/water (weight, wilting, etc.)? -Growing in clear containers, so I can see the line of where the soil is moist vs dry, Watering whenever it gets more then 50% dry. Usually every 3 days
Tap/RO/Distilled water?
-Distilled water
Ph before and after adding nutrients?
-According to my meter they are between 7 to 6.7.
Is your Ph equipment properly calibrated?
-It reads 7 PH in my distilled water, which is the same that some PH strips I bought read. So I would assume yes. However it is a 7$ meter so I'm not sure.
Light intensity/Age of bulb/Wattage?
-Total wattage is (26*6 + 32)=188 Watts. 4 of the 26watts are 6700k while other 2 are 2400k. The 32 watt is 5100k
Distance to the canopy?
-3-5"
Temps at canopy?
-80F 26C
Temps at root zone or reservoir?
-Guessing around same as canopy
Day/Night temps (Min.-Max.)?
-Day: 80-85 night 70-80
Current air flow (CFM)?
-Don't know for sure but air is being exhausted with 9" box fan so easily 60+
Is there air blowing directly onto plant?
-No, only passive air movement from air intake hole. which is at around stem height.
Using CO2?
-No
Relative humidity?
-40-50%
Growing technique (Scrog, Sog, Supercropping etc.)?
-LST, as you can see in the pick the effected plant is in the process of being bent over.
Has plant recently been pruned, clones taken, fimmed or pinched?
-Nope
Pests?
-Small amounts of nematodes in soil but all the other plants have them as well and they don't show the same problems.
Chemicals used to irradicate?
- None


Thoughts: I figure either heat burns or a fungus/mold of some kind. I'm not sure about heat though as the temps are low and even some of the lower leaves are showing similar problems, though as you can see from the group shot the one with problems is my biggest plant. So I don't know, anybody care to weigh in?

 

[grapeman]

Did you get a few drops of water/nutes on the leaf when you watered? Looks like a minor burn and unless it spreads, no worries.

 

[cobcoop]

Get rid of the clear jars you are using. The roots don't like the light.

 

[lloyd]

Get rid of the clear jars you are using. The roots don't like the light.

agreed also make sure you have the proper PH. also at this stage with your set up you dont want to add nute. every water. peace

 

[MynameStitch]

omg I am so pissed, I need to change the settings on my account cause I keep closing the window!!!!! : MAD: :MAD: :MAD:

Ok, retype!

Feeding schedule?
-Replanted 2 weeks ago into current containers which were mixed with ferts for 10:10:10 ratio. Will add more 1 week from now according the fert bag

BAD IDEA, stop right there, do not go by there directions, fox farm products are already hot to begin with, the age and size of your plants and when you transplanted them into the soil that already had ferts in there, )you added) you got it too hot and now they are getting burned.
You go by the size of your plant when determining the amount of ferts to give, soil is the same way. You don't want a rich soil mixture right after they are transplanted out of weak soil, with the age your plants are. You should of mixed it down with a weaker soil.
The yellowing you are seeing at the bottom is normal, these are "2ndary storage tanks" I call them, after to cotyldons drop off those 2 leaves act as a booster to help it.

Distilled water is bad for smaller plants like this, robs them of micronutrients they need and since you don't have a full micronutrient, I would be mixing 50/50 tap/distilled.

Your meter you are speaking off; sounds like the soil probe tester, these things are the biggest waste in the world, they almost always read 7. Ph test strips are more accurate than that soil probe junk.

Water runoff Ph?
-No runoff from the pots, they have holes in the bottom but water rarely runs out of them.
Nutrients added?

You want to let some water trickle out the bottom when they are in the correct pot size, when they get older you should let nice amount of water come out at the bottom, this helps wash out left overs the plants don't use, that when built up they cause problems.

Right now from my view, it looks like they are being burned, I would flush them out if I were you.

When did this problem start?

did this happen.......
when the plants were showing nitrogen problem (yellowing of it's 2nd set of leaves) before you transplanted them into this mixture? and now they are in this mixture after they have been fed, it started to burn them......?

What brand of soil do you have them in now? You say it's unfertilized?

 

[Enthusiasm]

BAD IDEA, stop right there, do not go by there directions, fox farm products are already hot to begin with, the age and size of your plants and when you transplanted them into the soil that already had ferts in there, )you added) you got it too hot and now they are getting burned.
You go by the size of your plant when determining the amount of ferts to give, soil is the same way. You don't want a rich soil mixture right after they are transplanted out of weak soil, with the age your plants are. You should of mixed it down with a weaker soil.

I sort of did what you said, my description of my transplanting method was a bit compact. Specifically when I initially transplanted them the soil was 5-5-5. Then after a week when I started to see a good amount of new root growth I added the neccessary amount of fert to make the soil 10:10:10. I did stick the new plants straight into the current fert concentration.

Distilled water is bad for smaller plants like this, robs them of micronutrients they need and since you don't have a full micronutrient, I would be mixing 50/50 tap/distilled.

By tap water I assume you mean tap left out for a few days (evaporate chlorine etc etc)? I'm working on that right now.

Your meter you are speaking off; sounds like the soil probe tester, these things are the biggest waste in the world, they almost always read 7. Ph test strips are more accurate than that soil probe junk.

I figured, it seems to give PH readings ranged +- 0.5 depending on where I stick it in the soil. Is there a good source for accurate PH strips? The ones I have now are for fish tanks and costed like $15 for 20, hardly the best deal.

did this happen.......
when the plants were showing nitrogen problem (yellowing of it's 2nd set of leaves) before you transplanted them into this mixture? and now they are in this mixture after they have been fed, it started to burn them......?

Well both of my 2 larger plants(if you look at the group shot you can see which ones I'm talking about) started showing a slight N deficiency after being transplanted, I chalked this up to a bit of root loss they suffered during transplant. However after a week all new growth was healthy and I added the ferts to bring them up to 10:10:10. Sometime after that the leaves started to show the discoloration, though I can't say for sure.

What brand of soil do you have them in now? You say it's unfertilized?

Unbranded, it's a mix made by the local greenhouse. They use it for all the plants in their botanical garden so it seems to be pretty high quality.



Anyways after investigating I'm thinking that it's the heat from the lights that were drying out/burning the leaves. I moved the lights up a few more inches, if the problem goes away then good, if not Ill flush the ferts out and see if that fixes it. I'm inclined to believe it's heat though, especially since once I started LSTing the plant, the brown stopped spreading on the one leaf and instead showed up on another leaf that was now closer to the light.

I guess Ill pose another question as well: These are 2 Liter/ 0.5 Gallon pots I have them in, is this going to be too little space for the plants? I'm not going to let them get bigger then 1.5-2 feet (as my growbox is only so big).

Thanks for the help, Ill post with more updates later.

 

[MynameStitch]

Ya, it sounds like your mixture is a little too much for them right now, not to mention with there size, they don't like it.

yup, tha tap water is what I was talking about.

You can get a pH pen from a hydro shop and some calibration solution or you can get some pH test strips from a pool/spa supply store.
Make sure it has a good range, some of them out there only have a median range like 6 to 8 PH and so forth....

From my experience that does not look like light issues, I know you are using fluros, which you can add too much light per sq feet, but from my experience it looks like the mixture is too much or your pH is out of wack.

Without knowing what is in it, you most defiantly need to pH test the soil, not to mention you don't know what nutrients are in the mixture, you should not have fed them yet, new mixture and lets say it has nutes in it, you add more by using ferts when they just got into fresh soil you will burn them.

 

[Enthusiasm]

So instead of making a new thread I figured I'd just bump my old one. After flushing my plants and making sure they received a more consistent watering schedule: things have been going well. I switched them into flowering about 1.5 weeks ago and have been attempting to identify the sex of each one. There are 2 that seem to be definitely female, the first picture is of one of them.

-The next 2 pics are each of the plants I suspect to be male. Does it look like I've made the correct call?
-Is there anything I should do with the male plants besides kill them off? One of the males was much more indica dominant then the other 3 plants (I was growing from random bagseeds) could I pollinate part of one of the other plants with it to create a hybrid? I plan to buy specific strain seeds for my second go, but it would be fun to grow my own hybrid strain as well.
-Once I remove the 2 males Ill be freeing up alot of space inside my cabinet, can I continue to LST my remaining females to help fill that space even though they are into flowering now?


Bonus last pic is a group shot of all my babies.

 

[happyherb]

read up on here about how to pollinate...

then also...you could save some pollen in some folded up paper "less ANY" green matter...it will turn to mold and wreck your packet of pollen and any other pack thats in your jar.....you dont need alot in each pack,a little goes a long way... put the folded paper into a tight screw lid jar will rice or desiccants ect and place in freezer for up to and maybe over a year and use on future strains you may get.HH. =]-~