Browning Tips - Problems, 5 weeks into flower

Hi everyone. I'm getting towards harvest on my first ever grow! I have 3 females out in a greenhouse which I started force flowering on or around the 10th august. The buds are starting to develop well on two of the plants but I am having some major problems with nutrient imbalance, possily lockout?

I am feeding them every second watering with a basic tomato feed, approx 5%/5%/5% with some added micronutrients and minerals. The water is approx. pH7 I think. I turned a greening color when tested with universal indicator paper.

I have attached images of the two girls I am having problems with one.

1. One has severe browning of leaves with the ends very dry, bittle and rolled up.
2. The other has some very yellow leaves and I just starting to get brown tips like the first plant.

Any advice on what I could do to remedy this and hopefully get a good harvest in about 6 weeks is greatly appricated.

BTW all the girls are feminised Super Lemon Haze by Greenhouse Seeds

Thanks in advance everyone!!

The first 3 images: (IMAG0123.jpg,IMAG0122.jpg and IMAG0085.jpg) are of plant one.
The other 2 (IMAG0092.jpg, IMAG0091.jpg) are of plant 2

Also here is a pic of the 3 6ft tall girls together! Thanks everyone!

what size container are they in?

They are in 5gallon containers i think. I know they are probably much to small for the size of the plants, and more than likely root bound but due to current conditions I can't change the pots. Long story...

fill out the troubleshooting form (link in my sig) to be getter, more accurate advice.

-shake

What is your experience level? first timer

Your Equipment:
.1) Outdoor
.4) Is there a consistent fresh air supply? Yes,The door of the greenhouse is left open
.5) N/A
.6) N/A

Your medium:
.7) Peat based soil, with no extra aditives by me
.8) 5 gallon
.9) Yes

Your nutrients and water:
10) Source of water? tap water, about pH7
11) Method of checking water ph. test strips
12) Method of adjusting water ph. Not adjusted
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule: Doff Tomato Feed, 4-4-12 with 0.1% Magnesium Oxide. About 15ml per gallon of water.
14) How often are you watering between feedings, and how much per watering? maybe once between feedings and about 1/3 of a gallon each
15) Any additives or tea's? No
16) Are your ph levels stable, or do they fluctuate? Not sure
17) What is your ingoing water's ph? ...your runoff ph? Not Sure
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? With the same fertiliser as above, about every second evening

Your growroom:
19) outdoors
20) What size of closet, room or hut? About 6ft x 5ft by 3ft
21) What are the temps and humidity levels while lights are on? N/A
22) Have you seen signs of insects in the growroom? Yes

Your strain:
23) What strain are you growing? Super Lemon Haze (Sativa dom?)
24) From seeds or clones? Seeds
25) Is this an autoflower strain? No

Thanks in advance everyone

Looks like overfertilizing, and possibly rootbound. Check the roots just before a watering, and see if there's any organic material (potting soil) visible.

Are you adding unsulfered molasses, or any other source of calcium?

Hi, I'll check to see if I can see any soil the next time I water them, Are you asking can I see any soil around the edges of the pot? No i'm not adding any source of calcium, should I be? If so could you advise me what I should do? What can I do to counter-act rootboun without changind the pots?

Thanks again

Quote:

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Originally Posted by IrishSniper

Are you asking can I see any soil around the edges of the pot?

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Nope. What's more abundant inbetween the visible roots? Air or organic matter? (don't destroy the rootball by checking inside the rootball)

Quote:

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Originally Posted by IrishSniper

No i'm not adding any source of calcium, should I be? If so could you advise me what I should do?

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1 tsp unsulfured molasses per gallon of water, once a week from mid to late flowering, till harvest.

Quote:

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Originally Posted by IrishSniper

What can I do to counter-act rootbound without changing the pots?

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Pray that rootbound isn't the problem.

Thanks for the help Rusty! I have a feeling the soil is very compressed as there is no add perlite or anything to make the soil airier. I will begin adding molasses for calcium. Do you think the curling up leaves are from over fetilising? Will I reduce the number of times I feed them?
Thanks again!

Sorry for the double post. Has any body got any ideas as to what I should do to fix these problems

Sorry. Dealing with wife being in the hospital.

How far from the top of the pot is the soil? If rootbound, you might be ok with carefully lifting the plant out and adding enough soil to the pot to raise the rootball to within an inch or two of the pot rim, but leave enough room for watering properly.

Perlite (or if need be, vermiculite) is a must.

Unless you have a full compliment of square pots, might be best to use round ones.

How often are you feeding at that rate, and is that what the directions say to do?