Leaves losing color and leaving spots

[OldGrumpy]

Honourable forum users!

I come asking for your wisdom and advice, my first grow and ive searched all over (including many posts on this forum and others) for an explanation for these discolorations.

Problem: Yellowish discolour on lower leaves, looks like the leaf is losing its colour turning it yellow/brown/white-ish

Medium/grow method: 80% garden soil, 10% perlite, 10% diluted cow manure
Composition of garden soil
NPK 14-7-15 mkro 1,5 kg

mg/l
(N): 240
(F): 70
(K): 250
(Mg): 200
(Ca): 350
(S): 120
(B): 0,5
(Cu): 1,7
(Fe): 70
(Mn): 20
(Mo): 0,7
(Zn): 4,0

Feed: and supplements used:
Small amount of tomato nutrients (NPK 3-0,3-1) 8 days ago.
Gold Label Special Mix nutrients added for the first time two days ago. 1/5th of the "prescribed" amount.

water source: tap water, watered every 5 to 6 days due to very high humidity.

Strain/age: autoflower / 5 weeks

light used: UFO-120 CreeLeds Osram led grow light (on veg mode for the first four weeks, on veg+flower since a week back)

Climate: Wine cellar, damp, 70-75% humidity, 18-20C°.

Additional info: Finally got a tent up today. New climate is 24°, 45% humidity.


Photos:

 

[420Forever]

Honourable forum users!

I come asking for your wisdom and advice, my first grow and ive searched all over (including many posts on this forum and others) for an explanation for these discolorations.

Problem: Yellowish discolour on lower leaves, looks like the leaf is losing its colour turning it yellow/brown/white-ish

Medium/grow method: 80% garden soil, 10% perlite, 10% diluted cow manure
Composition of garden soil
NPK 14-7-15 mkro 1,5 kg

mg/l
(N): 240
(F): 70
(K): 250
(Mg): 200
(Ca): 350
(S): 120
(B): 0,5
(Cu): 1,7
(Fe): 70
(Mn): 20
(Mo): 0,7
(Zn): 4,0

Feed: and supplements used:
Small amount of tomato nutrients (NPK 3-0,3-1) 8 days ago.
Gold Label Special Mix nutrients added for the first time two days ago. 1/5th of the "prescribed" amount.

water source: tap water, watered every 5 to 6 days due to very high humidity.

Strain/age: autoflower / 5 weeks

light used: UFO-120 CreeLeds Osram led grow light (on veg mode for the first four weeks, on veg+flower since a week back)

Climate: Wine cellar, damp, 70-75% humidity, 18-20C°.

Additional info: Finally got a tent up today. New climate is 24°, 45% humidity.


Photos:

hey @OldGrumpy and to afn! good info there & luv ur avatar me not a plant doc, but will try to round up a couple who are

ppp &

 

[Harry_Kovert]

possible spillage is the only thing my inexperienced mind is thinking as it only seems to have affected one / two leaves? Wiser heads than I will likely be along in a jiffy!

 

[baked in the bluegrass]

Heya there, welcome to afn.
Hopefully one of the staff will pop in, until then im wondering...is it spreading at all? Cause it looks like just the oldest fan leaves atm, and someone else was saying it could be nute splash damage or some such.
If its not spreading then maybe thats what it is, which shouldnt really cause any harm going forward

 

[OldGrumpy]

Thanks for the welcome and replies! Could indeed be spillage after my sloppy and hurried first feeding. However, i believe i saw some spread in the immediate effected areas (could be those parts were slower to react to the burn). Should i leave everything be and wait it out or get rid of the discolored leaves?

 

[Harry_Kovert]

As mentioned be patient and wait for wiser heads to pass comment.....Myself and my right honourable friend Baked - experts we are not!

Don't rush in trying to find a solution to a problem that doesn't really exist - unless you know fo sho bruvva.

Use the force.

 

[HonestGR]

I dont think its magnesium deficiency.

It could be a pH issue however. This "could" cause a lock out of specific nutes however.

The tap water you used, do you ever monitor the pH comming out?

If you are, great. I would continue to monitor, I dont think its anything major. However if it spreads or appears on another leaf let me know, I will look further.

 

[OldGrumpy]

I dont think its magnesium deficiency.

It could be a pH issue however. This "could" cause a lock out of specific nutes however.

The tap water you used, do you ever monitor the pH comming out?

If you are, great. I would continue to monitor, I dont think its anything major. However if it spreads or appears on another leaf let me know, I will look further.

Aha! Apparently the water in the tap is pH 8,1. I'll need to adjust for the next watering, perhaps add some nutrients as well to help the plant catch up?
Thanks!
Lesson learned..

 

[HonestGR]

Aha! Apparently the water in the tap is pH 8,1. I'll need to adjust for the next watering, perhaps add some nutrients as well to help the plant catch up?
Thanks!
Lesson learned..

Just some pH down, Ya it was porbably lock out for some nutes There is probably enough nutrients in the soil for her, worst case if it continues, give the soil a good flush then following the flush (follow watering) give her some nutes.

Best of luck!

 

[OldGrumpy]

Just some pH down, Ya it was porbably lock out for some nutes There is probably enough nutrients in the soil for her, worst case if it continues, give the soil a good flush then following the flush (follow watering) give her some nutes.

Best of luck!

Thanks!

Dealing with pH levels is a new science for me. The most widely available substance I can find to lower water pH levels is used for swimming pools and hot tubs. Can I use these or do I need specific a pH down solution for gardening purposes?
How urgent is the need to fix this problem do you reckon? If not urgent I can get back to my site in 5 days, before that and it's going to be a hassle for me..