Bleaching

[leafminer]

My latest batch of clones is having a struggle. I'm getting a lot of bleaching; have never seen the leaves turn pale yellow so quickly. I don't normally have this problem. Could it be too much light? I have them in about 6K lumens/ft sq but quite far from the lamps. Temp in the grow room about 11-14C, a bit low I know. 16/8 timing.

 

[umbra]

imo it is N being sucked out of the leaves. try lightly misting with a dilute nute spray and see if there is new growth.

 

[2Dog]

was the plant you took them from maybe nute deficient?

 

[leafminer]

I don't think that's it, 2Dog, because there are two different sets of clones, the Domina and a bagseed sativa. I don't usually have this much trouble. Maybe it's the temps . . . I just tried Umbra's suggestion and misted them with a solution of ammonium sulphate. Nothing but nitrogen in that. I am getting somewhat concerned.

 

[2Dog]

it could simply be that they are rooting aggressively and using the goods down there...maybe the mist will help...anyway to get them warmer?

 

[ozzydiodude]

IMO 6000 lumens is to much light for clones. Might try a shade to cut the lumen that are reaching the plants down alittle

 

[leafminer]

I'll do that, Ozzy. Worth a try! I'll shade them a bit rather than switch off a lamp because I have a Domina vegging in there.

 

[ishnish]

i give my clones 24/0 light cycle. and IMO, you should get your temps up.

22-26 C i think would be what you want. I'm in Fahrenheit land and keep my clone temps around 75-80

 

[BioDynamic]

Cold temperature = cold soils = nutrient lock up, retarded photosynthesis, reduced energy use and increased sugar storage; (lower yields, stunted growth, are usual outcomes) ...also effects transpiration, respiration, germination, and flowering.

 

[leafminer]

Umm. OK. I think I will get the MV lamp out. It is only 10K lumens but 450W, gets pretty warm ...