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I agree with Bigtopsfinn, You might be nute burning, not heat burning. The only way I've seen heat burn with my CFLs is to have them actually touching the CFL.
You want your grow space to sit in the 70-78F range roughly. So if your box is getting to hot then add fans on the top of the box(blowing out). Then drill vent holes in the bottom(because heat rises).
That will also pull more CO2 enriched air through the plant/s, while keeping it cooler:thumbsup:.
I don't really think it's nute burns. I havn't started using them untill just this week. I'm using Fox Farms, using it at about 1/4 recomended strength, and have only added it for one watering. Other than that this girl is 100% au-naturale :D
I don't have a thermometer, but I'm fairly sure it is getting up into the high 80's in there at least. I'm thinking it is just my blower engineering because when I open the front of the box I get blasted with heat.
I think I'm going to try getting that black fan up a bit higher, possibly making a vent tube of some sort, and getting some vent holes in the bottom.
On a more positive note, I checked the PH of the water that came through my soil yesterday and it was spot on. On top of that, after adding the nutes I saw some explosive growth, even with the burning going on. I'm happy with this grow as a learner, but am thinking about getting some of these comming for my next try.
Yea those temps are way to much. Somewhere in the high 80's, like 85-88F and the plant stops exasperating(might be the wrong word:D). From what I understand, it ceases taking in or out gassing as a protective measure to retain water. Thus it stops growing, and leaf tips can suffer as the plant can't deliver water to the tips fast enough.
All you need to do is add some sort of small fan to pull air out the top of the box. Then some holes near the bottom for fresh intake. Even the fan you have in the box aimed at a hole would likely help. However a computer fan or something similar is best.
I'd agree though, it's less likely to be nute burn(but still possible). Likely it's heat stress.
Thats a bit puzzling to me, because it is still growing. Fairly fast infact. Mabey it is getting a nute burn also? I'll try flushing it at her next watering to see if that helps. There was a small amount of used coffee grounds in the soil I origanally used. Perhaps it is still kicking out a ton of N.
Do a little of both.
Don't actually flush, just water with straight water a couple times, then try nuting again.
AND try to keep those temps in the high 70s if possible.
As fast as these things grow, it'll be no time before you can't even see the few damaged leaves through the thick new growth.
...cuz they have such lovely shite at such loooovely prices. Whilst browsing in my #3 dolla sto, I found some cheapie wood-and-red-ammonia thermometers... that seemed to agree with the digital one on the wall, and didn't look too beat-up...
bought one for SeedCloneLing Land... and the best part...
It only cost me a DOLLAR.
Gotta love that ;) Still looking for my one-dollar hygrometer that isn't pure shite!
As for my own first grow, I solved a heating issue by adding three 12v muffin fans I bought at my local electronics supply surplus store, along with a 12v, 2a plug-in adapter that wasn't even polarized. I wired 'em in with some shitty speaker cable, and made sure that they were 'forcing' the issue around the edges of my garden, while pulling heat up fast.
Runs around 78-81 now :)
(c)C :chainsaw:
Yeah, I know. Thermometers are dirt cheap, but I live out in bum-f*^k-egypt where we don't have those kind of stores. The nearest place with that kind of store (dollar store, walmart, target, ect.) is an hour and a half drive. Still I can pick one up fairly inexpensively around here, but I have droped so much on this first experimental grow that I hesitate to spend more. At least till next time.
Anyway I played around with my situation, and I think I have the problemb solved. I now even am able to turn on the extra 26w cfls with no more burning.
On a side note, I cut a small branch off last night for a clone. So far so good. It really isn't even wilting much. I must have done something right :D
...if I could add another :twocents:...
RUN, don't walk down to your local gardening/hydro emporium, and get yourself a cheapie 10dolla bottle of Wilson's rooting liquid. It has one of the highest concentrations of IBA (the main rooting inducement), and one of the lowest prices. I'm not sure if it's too late to use it on your existing clone taken (might have to do one watering of it with a small, dilute concentration) as you're only supposed to do it once...
But for every snip that you take that looks like it could live, you dunk it immediately into water, then slightly higher cut at 45 degree angle while under water, wrap cut end-bit in a bit of cotton pulled from a q-tip, and dunk cotton-y bit into rooting compound with sterile tweezers. THEN place it (still with sterile tweezers) in whatever rooting medium you use.
I had great success with seedlings, but horrible success with clones until I started doing this.
The OTHER thing to really really be careful of is to NOT let it dry out... since it doesn't have a root system yet, it has to take everything in thru the leaves. Use a really really weak nute solution in clean, PH'd water to mist 'em with like every hour, or as often as they need it. I use rockwool as a starter medium, and keep the bottom of the rockwool in about ¼" - ½" of water in a tray, covered with nearly-tight humidity dome.
Place said dome near some 4100k to 6500k flourescents, and watch the little thing leap up to them in happiness :)
(c)C :chainsaw:
The first shot is the outside of my box when it's all closed up. I pulled the box out a bit, sealed around the fan with a blue towl, cut a few small holes in the bottom and created a vacume that sucks out the heat. When I put my hand up to the whole I can really feel the air getting sucked in nicely:thumbsup:
I ended up placing some emergency blanket on the two walls. I don't really like having the bulbs sit against the cardboard even if they really don't get all that hot. Since I've read that heatblanket is a semi-sort-of decent reflector, thought better safe than sorry.
First one is my clone in its little dome :) I took the cutting off with my razor (you can see where I took it in the last pic), recut under water, slathered with some clonex and stuck in a coconut pellet that I expanded inside of an old flower tray cup. :rambohead: That is one long ass sentance :)
Two is an overhead shot.
Three is the main stem. The dirt is some local made hummis wood compost with a tad of lime added mixed with about 40% perlite. It doesn't look like it in the photo because I was a bit short on dirt, and instead of mixing up more compost pearlite dirt I just added an inch or so of 100% compost.
Four is just up from the last photo and shows how I'm LSTing, and like I previously stated where I took the clone. I first tied a piece of twine around the base of the lip. Then I tie one end of a piece of twine to it, around the branch I want to tie down, cinch it up and tie the other end.
When I look at my earlier posts I can't believe how much I've learned already. I'm decently happy with this grow so far, but am really looking forward to the next already :D