brown splotches and purple stems

[Randm999]

First time grower and first time poster. I know I've seen this symptom in the various posts befor, but I can't seem to locate it.
Indoor grow, under two 400 watt mh. 24/7.
soil: Organicare Pure Earth. in 5 gal containers.
White Widow aproximately 7 weeks into veg.
Temps are low, as the grow room is an outdoor shed, lows are aprox 45 deg highs around 70.
Ph unknown as I havent got my meter yet ( Its on order)
Fed twice with Humbolt nutriants 5-9-4 at 1/2 streangth. and twice with Alaska fish
transplanted from 2 gal aprox two weeks ago.

The Large fan leaves on the bottom are the predominant site of the problem. New growth looks ok. The stems of the leaves that show the problem have a definate purple tinge to them. The younger stems look ok.

I have 7 PPP that look fine, and 5 white widow with only one showing advanced signs. Several other of the white widow also starting to show identicle symptoms.

Any help would be appreciated, see photos.

Randm999 Reviewed by Randm999 on 03-04-2010. brown splotches and purple stems First time grower and first time poster. I know I've seen this symptom in the various posts befor, but I can't seem to locate it. Indoor grow, under two 400 watt mh. 24/7. soil: Organicare Pure Earth. in 5 gal containers. White Widow aproximately 7 weeks into veg. Temps are low, as the grow room is an outdoor shed, lows are aprox 45 deg highs around 70. Ph unknown as I havent got my meter yet ( Its on order) Fed twice with Humbolt nutriants 5-9-4 at 1/2 streangth. and twice with Alaska Rating: 5

[Ayyxbleezy]

most likely it is nute burn or a ph problem :rasta:

[myalbania]

my one baby has the same think but alot smaller( just a small circle size)

[Faddenator]

You are underfeeding.

Purple stems = cold temps and phosphorus deficiency
Crispy lower leaves = N-P-K deficiency.

keep feeding her 1/2 strength but every other watering, not twice in 7 weeks!

You should also really try and do something about those temperature swings. A 25F degree drop is huge, especially since growth virtually stops below 50F. I find a small (6") fan-forced heater is a godsend. I have a sunbeam model that keeps the room at a constant 76 degrees.

Good luck!

[palerider7777]

the npk problem can be due to ph being out to far causing nute lock out.

[Faddenator]

the npk problem can be due to ph being out to far causing nute lock out.

True, definitely get your ph checked out. I'm still going with underfeeding though... two 1/2 strength feedings in 7 weeks seems very low to me.

[Rusty Trichome]

Growing a sativa dominate strain (PPP) with an indica...at the same time? Can get tricky keeping track of different nutrient levels and schedules. The PPP will likely be double the height of the WW in flower, and the WW will be a quicker finisher.

Find (Google) the Humbolt feeding schedule and stick to it till you get familiar with the strains and the nutrients. :thumbsup:

Mixing nutrients from two different manufacturers is not recommended. There's no "indusrty standard" of added metals, micronutes and fillers, and on occation...they can clash. (over-nute, or lock-out nutrient uptake altogether)

[WashougalWonder]

The red stems may also be an indicator of the plant being female, and at young age I would look at that over not enough nutes. That is what I see in the pictures, a young female. Transplant and see if the issues resolve.

I would try to keep the temps no lower than 50 degrees, as was mentioned, purples come from cold too. That is why my avatar is so purple, it got too cold.

[Randm999]

Thanks everyone, The cold is probebly the major factor here, as I am growing in an unheated shed. Power usage makes it impossible to install a real heater in the unit, I was hoping that the heat from the lamps would prove sufficiant. I'm going to try a small fan/heater that I have directed at the plants to up the temps. I was under the assumption that cold (lows around 45 deg) would do nothing more than slow the growth rate. My ph test kit should arive in a day or two, then I could get a more accurate handle on the situation.

Thanks again for the input

[Faddenator]

Thanks everyone, The cold is probebly the major factor here, as I am growing in an unheated shed. Power usage makes it impossible to install a real heater in the unit, I was hoping that the heat from the lamps would prove sufficiant. I'm going to try a small fan/heater that I have directed at the plants to up the temps. I was under the assumption that cold (lows around 45 deg) would do nothing more than slow the growth rate. My ph test kit should arive in a day or two, then I could get a more accurate handle on the situation.

Thanks again for the input

The cold will only slow growth rate... but slowing down growth every night has got to put a lot of stress on your plant. Sounds like you have a similar fan forced heater that I have... make sure you put it on the floor facing ACROSS your plants, not AT them.

I also still think you need to feed more often.