Hello/ Help please, nute burn in coco

Hi,

Long time reader 1st time poster.

SWIM is growing some blue cheese in coco and having a few problems, please see pics attached.

Background:
22 days old from seed. Height ~4 "- AS SEEN IN PICS
Medium: Straight coco
Temp: between 24- 28 C
Humidity: Low have no RH meter- mist with pure water twice per 24 hrs, but because of ventilation and fan not much build up.
Light: 250W CFL, initially 3- 4 " away- suspected light burn so raised it to 8" above.
Pot size: 9"
Water: Tap water left for 24hrs to try to reduce chlorine, ph ~7, (NO UP OR DOWN AVAILABLE) Watered by hand ~ 250ml per 24 hours- get 10 % runoff
Nutrients Used: Ionic Coco: formulex, grow, bloom, boost. Superthrive.

Feeding Schedule from seedling:
1st 3 days- IN SMALL PAPER CUP SIZED POTS. little watering of plain water
Days 4-6: Water with formulex solution. 5ml/litre
Day 7: Roots showing through first pots so transfered to 9" pots- no water/feed
Day8-9: Water with formulex solution 5 ml/liter ~250 ml until runoff
DAY 10 WHEN THE PROBLEMS BEGIN: Slight wilting of 2 plants- so took action (regrettably) Changed Feed to 5ml/litre Ionic Grow ~250ml/ 10% Runoff (I BELIEVE I MAY HAVE SHOCKED THEM HERE???)
Days11-13: Continued to feed 5ml/litre ionic grow. Plants looked to recover (No wilting)
Day 14: WATER FLUSH
Day 15-16:Stupidly up'd food to 10ml/ liter. Plants showed yellowing of leaves
Day 17: WAter Flush to try to recover
DAy 18-19: Ionic Grow 7ml/ liter- showing signs of nute burn/ light burn. MOVED LIGHT UP
DAy 20-22: WAter FLush- 250 ml per pot twice per day- EC steadily decreasing from 1.8 to now 1.2

PLEASE HELP/ THOUGHTS???

No responses?

I'm looking for some advise as to if they are ok/ showing signs of recovery/ how long to continue flushing for etc.
Any help would bee appreciated.

Used the Diagnosis template if that helps any further;

What is your experience level? novice-experienced

Your Equipment:
.1) Type and wattage of lights.
CFL 250W

2) Distance from tops?
around 8"

.3) Reflector type?
budget al.
.
4) Is there a consistent fresh air supply?
Yes.
.
5) Do you have an exhaust fan and a circulation fan?
?Yes nt setup yet- need to soundproof fan

.6) What are the bulb wattages, kelvin ratings, and schedule?
250W 16/8

Your medium:
.7) Specific brand and type of soil
Canna Coco 50l sack
.8) Size of container
9" round pots
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings?
No, germinated in paper towel

Your nutrients and water:
10) Source of water?
tap-ph=6.8-7
11) Method of checking water ph
iodine kit

12) Method of adjusting water ph.
with nutrients

13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
Day 10-13: Ionic Grow (2.0-0.6-2.5) 5 tsp/gal, Superthrive 3 drops/gal,
Day 14: WATER FLUSH- (fornightly)
Day 15-16: Stupidly up'd food to 10ml/ liter. Plants showed yellowing of leaves
Day 17: WAter Flush to try to recover
DAy 18-19: Ionic Grow 7ml/ liter
DAy 20-22: WAter FLush- 250 ml per pot twice per day- EC steadily decreasing from 1.8 to now 1.2

14) How often are you watering between feedings, and how much per watering?
feed once per day ~250ml per pot.- 10% runoff
Have been flushing twice daily 250ml water each time- 10% runoff

15) Any additives or tea's?
Superthrive

16) Are your ph levels stable, or do they fluctuate?
Unsure

17) What is your ingoing water's ph? ...your runoff ph?
Ingoing is around 6.8-7 before nutrients, cannot tell after nutrients added / runoff due to colour change

18) Do you foliar feed? If so, with what, how often, and at what time do you spray?
Spray when lights go off plain water

Your growroom:
19) Indoors or outdoors?
indoor
20) What size of closet, room or hut?
1m x 1m x 2m h room,
21) What are the temps and humidity levels while lights are on? ...With lights off?
lights on temp=25 C
lights off temp= 20 C
22) Have you seen signs of insects in the growroom?
no

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?)
Blue cheese

24) From seeds or clones?
Feminised seeds

25) Is this an autoflower strain?
No-Big budda blue cheese

Quote:

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Originally Posted by dabbadoo85

Water: Tap water left for 24hrs to try to reduce chlorine, ph ~7, (NO UP OR DOWN AVAILABLE) Watered by hand ~ 250ml per 24 hours- get 10 % runoff

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The Ph range for Coco is 5.8 - 6.3 (most people including myself use 5.8) You need to get a PH meter or some PH strips to get the PH right, your plants are not going to do well if they are not in the right PH range to absorb the right nutrients.

Quote:

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Originally Posted by PhatJay

The Ph range for Coco is 5.8 - 6.3 (most people including myself use 5.8) You need to get a PH meter or some PH strips to get the PH right, your plants are not going to do well if they are not in the right PH range to absorb the right nutrients.

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Cheers, phats

A couple of other things I noticed. You have flushed them 3 times in 7 days, they could be just showing signs of overwatering. Also... Measuring outgoing PH and EC in coco is not worth doing afaik. Because PH and EC readings are affected by small particles in the coco. You just have to measure what you put in.

I think I can see 7 plants in one of the pictures. 1x250w CFL will not produce enough light to grow 7 plants. You wil just get lots of small popcorn buds all over the plants, instead of fat buds.

hope this helps...

:)

yeah that does help :),

i'll save some time n just measure the ingoing feed/water, still need to get a ph meter tho.
correctamondo, there are 7 plants, the CFL is for vegging, i plan on using a 600w HPS for flowering... will that work or do i still need more light for vegging?
i thought over watering was hard to do in coco, but nice one i'll keep an eye out for signs... I was just trying to flush the system from the nute burn hence the frequency.

Just from those pics, it looks like they're not getting enough nutes, believe it or not. Pale green and slight yellowing of the interveinal areas indicates low nitrogen. If you think EC of 1.8 is too much, how about trying the middle ground at 1.5? I don't see the yellowing that you thought was nute/light burn. Fert burn usually starts at the tips of the leaves and works its way towards the middle of the leaf and stem. I don't think you're going to see light burn from CFL. That usually happens with real hot bulbs, like sodium and MH. Other than that they look good. Great start.

Yes Polish :), glad to hear from u, u seem to know your stuff from reading the boards... cheers for the encouragement too.

I was thinking about maybe a lack of nutes could also be the problem, just no reference to go off other than here. nute burn seemed the obvilous solution as i rushed the introduction of nutes, and went over the stated amount on the bottle.

I've attached 3 close up pics of the suspected nute burn affected areas, apologies for the res.

Q. I was planning to continue just water for a day or 2, to recover from the nute burn, Just to clarify, from what u recommend would it be advisable to go back to a nute solution of EC1.5?

Also, should i lower the light again to ~3" above?

I'm know that u cant give exact advise as with all things in life it depends on individual circumstances and its best to see how things develop and adjust accordingly, just looking for some other input to swap ideas etc.

Just looking to get a nice healthy mother and some good bud to smoke.

Much appreciated.

Nute burn affects the tips of the leaves, it doesn't look like nute burn.