Hey, RIU. Having another leaf problem. Pls have a look and help if you can

Super Subliminal

Super Subliminal

Member
Incredibly confusing! Here's what led me and others to think it's K and not N! See the red dots? Haven't been able to get a good picture of them before now. Everyone says something slighlty different - it's so fucking confusing! Thanks for trying to help tho

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The spreading of the yellowing and the red spots seems to have stopped just before reaching the bud leaves. Thank god. This is all luck! Day 36 today. I pray to God she lasts another month

Pic of plant

20130621_123141.jpg
 
simisimis

simisimis

Well-Known Member
well plant looks quite green to me. it would be helpful if you'd post close up pict of a top shoot. brown red rusty spots tend to indicate mg deficiency. mg deficiency appears on lower middle set of leaves, also margins turn rusty, the leaves are also yellowing at later stages. p and k deficiences are not common especially P if growing in soil indoors. i'd start solving this with camg booster or epsom salts
 
Super Subliminal

Super Subliminal

Member
Hmm, that doesn't fit description either and it's getting worse today. Stems are purple now yes, but the other stuff doesn't fit. Can not find any infomation about this online at all! Isn't insects and doesn't look like the pics of "rust" i've seen.

worst bit. top of plant

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whole Top of plant

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bit lower down

20130622_102627.jpg20130622_102654.jpg
 
Super Subliminal

Super Subliminal

Member
I was going to say I'll buy some calmag now but honestly I'm looking at pictures of cal/mag defieciency and it doesn't look like that either!
 
ThorGanjason

ThorGanjason

Well-Known Member
Well, unless your temps are sky high I doubt that's the problem, BC didn't you say it started on the bottom and worked it's way up? It said in that link that heat stress generally starts at the top, BC the lights are too close. If it isn't from the light, then I guess it could start lower but it would require high temps in places other than just right under the hood. But who knows, maybe. It'd worth a shot to raise the light for a day or so and see if it helps.

I'm seeing what looks like some very red/purple stems on your plant, even in the middle of the leaf where the fingers connect. It kind of looks like phosphorous deficiency from the pics in your link.

Sorry, I know this is confusing, lol.
 
Super Subliminal

Super Subliminal

Member
Sorry. Yes it is confusing and I know it's confusing for people to try and help what with my messages being so fragmented. I'm not the best writer and I'm very dyslexic (thank you spellchecker)

The yellowing started at the bottom. The red/orange/brown spots started at the top. That's why I said previously I suspect I have two different issues. The "spots" (which are my only concern now - yellowing has stopped) is isolated to just the top of the plant. I had red stems anyway - that was normal for the plant in my experience and all other plants I've grown have had red stems and been fine) - but yes, some of them are purple now.

Basically where I am now, I've been told by people on here that I have a nitrogen deficiency, a potassium deficiency, a calmag deficiency, a phosphorous deficiency, and I have spider mites. You can see why I'm so confused. My logic tells me it's the heat. It's the only picture I've seen that looks EXACTLY like my problem. + isolated to top of plant. The reason I didn't think of this is because it's nothing like what I expected heat stress to look like. I have moved lights further away and changed position of fans onto the top of the plant. Will see tomorrow if it stops.....

What would you define as "sky high"?
I try to keep temps at 80 but they can go up to 90 (is hot here in London now) and if someone comes round to visit I have to close cupcoard door (no ventialtion) cause temps to go even higher. Also plant has no ventilation at night - to combat this I let the lights cool down for 20mins before closing the cupboard up

Thank you for trying to help, everyone. It's appreciated immensely
 
Alexander Supertramp

Alexander Supertramp

Well-Known Member
Yellowing beginning at the bottom=Nitrogen deficiency. Nitrogen is a mobile element so the plant is transferring it up.
Brown spot beginning at the top of the plant=Calcium deficiency. Calcium is a immobile element so the plant cannot move it around. So new growth is affected first.
Looking at your recent pictures you may also want to be on the look out for spidermites.
 
iblazetoomuch

iblazetoomuch

Active Member
Super Subliminal said:
Basically where I am now, I've been told by people on here that I have a nitrogen deficiency, a potassium deficiency, a calmag deficiency, a phosphorous deficiency, and I have spider mites. You can see why I'm so confused. My logic tells me it's the heat. It's the only picture I've seen that looks EXACTLY like my problem. + isolated to top of plant. The reason I didn't think of this is because it's nothing like what I expected heat stress to look like. I have moved lights further away and changed position of fans onto the top of the plant. Will see tomorrow if it stops.....

Thank you for trying to help, everyone. It's appreciated immensely
Click to expand...
Some dudes will tell you to piss in them and cut off the leafs, always take it as suggestion. =P.
 
Super Subliminal

Super Subliminal

Member
Alexander Supertramp said:
Brown spot beginning at the top of the plant=Calcium deficiency. Calcium is a immobile element so the plant cannot move it around. So new growth is affected first.
Click to expand...
Sorry for multiple posts. You are right it also looks like calcium def. Looks exactly like the photos I posted of the heat stress. Understand why it's confusing for a newbie. Please could you advise me what to buy? Have to wait til Monday now til grow shop is open.
 
iblazetoomuch

iblazetoomuch

Active Member
Usually calmag is used for calcium deficiency, you can google this to see many sources, I'm sure they will chime in before monday anyhow. You sure the nutes don't change your pH after you pH the water? Why not just pH it after adding nutes to it? Just curious, I'm not implying that is your problem or anything. I'm not even 100% certain on what quantity of calcium is available in the soil in the first place so it would be inappropriate to suggest something either way.
 
Super Subliminal

Super Subliminal

Member
The reading of the pH doesn't change, but like I said I don't trust the test strip - going to buy electronic one. Why not pH it after adding, didn't occur to me, good thinking.

Having looked around a bit it doesn't seem like calmag is commonly available in the UK
 
ThorGanjason

ThorGanjason

Well-Known Member
If your temps are getting up to 90 (°f, what's that like 28-30°c? I dunno) then that is probably high enough to where your lights could burn from a height they usually wouldn't.

I'm thinking that you had a nitrogen deficiency which fixed itself, and then started having a calcium deficiency that started with the spots and maybe just a bit of a magnesium deficiency that might be enough to turn your stems/petioles red but hasn't reached the leaves yet.

Cal mag is definitely seeming like your best option. Around here its really expensive so I bought some Epsom salt (magnesium and sulfates) and some calcium nitrate (calcium and nitrogen). They're both water soluble and readily available to the plant.

Cal mag is good stuff to have. I've heard during flower plants can't get enough of it.
 
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