fan leaves burning,...(henryface)

[henryface]

Problem:fan leaves burning, oldest first then when new fan leaves get bigger they burn too . They were fine unit two weeks old they were nice and green ,then went pale yellow looking with slow growth. So I gave sensi cal mag at quarter strength and it burnt them. They swing between looking deficient to over fed burnt . There in a mixture of plagron bat mix and plant magic supreme. I checked pH of run off its 6.9 the rain water I give is between 6 to 6.5. They are in a garage with window shut 5 inch carbon filter with inline fan on low in a cheap 1m by 1m 2m high tent with small oil rad there have been several frozen days and the temp got down to as low as 16c . I can only check them every two days grow tent stinks of new plastic beach ball smell when warm.
-Medium/grow method: soil; plagron bat mix and plant magic supreme mixed.
-Feed and supplements used: tried to give them quarter strength sensi cal mag when they first started looking offl, it burnt them .
-Water source:rain water checked the PH it's around 6.3
-Strain and age Fast buds rhino Ryder two months old should be finished just started to flower.
-Climate: in cheap tent in garage , temps between 27c and 20c has dropped to 12 a few times winter weather. RH around 50 a few times 30 on cold days . 5inch inline extractor fan with rhino carbon filter
- Light used:, LED, mars reflector 96 and mars pro 2 80. 24 inch from canopy mostly.
-Additional info: started on third set of true leaves , leave s stared to look pale and yellow then burnt ,they seem to swing from looking deficient to burnt.New growth is ok large leave s burning and pale plants . I start with 3 plants then planted another 2 in different soil they were fine for 4 weeks now they are getting same problems. I tried checking pH , flushing media, keeping eye on RH and temp. Could being sealed in garage for two days be a problem . I even though tent could be gassing off I have all the symptoms. I don't have a fan in the tent either I'm getting one tomorrow.

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[namvet25]

How close are your lights to plants?what is the NPK value of your feed and what is recommended dose and what dosage are you feeding.If you soil mix is not pure coco raise your feed ph closer to 6.5.Raise your cal/mag to 5mil per gal also.

 

[Waira]

...looks a lot like advanced Mg defc.,.... 1/4 str. Sensi Ca-Mg seems very unlikely to burn,.. advanced defc. symptoms can look a lot like burn too,... Soil hotness may be a factor as well; I don't know these soils well,... Bat mix is pretty hot very likely, but that would show in different ways,... need those normal light pics mate!
.. also odd that your run-off is more alkaline than what goes in,... in-pot pH is a whole different ball game vs. AN "self-buffering" in solution, like in reservoirs,.... too many other influencing factors... run-off is not a good measure of actual in-pot pH either,... Just to be sure, is your pH meter recently calibrated?
...when did you flush, and how much water did you pass through? generally, flushing is not recommended unless the situation is dire,.. badly off pH, huge nute overdose, that sort of thing,..

 

[henryface]

...looks a lot like advanced Mg defc.,.... 1/4 str. Sensi Ca-Mg seems very unlikely to burn,.. advanced defc. symptoms can look a lot like burn too,... Soil hotness may be a factor as well; I don't know these soils well,... Bat mix is pretty hot very likely, but that would show in different ways,... need those normal light pics mate!
.. also odd that your run-off is more alkaline than what goes in,... in-pot pH is a whole different ball game vs. AN "self-buffering" in solution, like in reservoirs,.... too many other influencing factors... run-off is not a good measure of actual in-pot pH either,... Just to be sure, is your pH meter recently calibrated?
...when did you flush, and how much water did you pass through? generally, flushing is not recommended unless the situation is dire,.. badly off pH, huge nute overdose, that sort of thing,..

Thanks for reply. I flushed about two weeks ago only about 5l. My friend gave them tap water before I checked the run off that's what he's been watering with when I'm not around , I only realised last night .when I checked tap PH it's 7.4 the ppm is 300 , . So from now on its rain water only . They seem to be perking up and looking greener , the cal mag is helping. The extractor was on a timer but I left it on all the time because I thought it may be stail air causing problems. But even though there looking better some fan leaves still drying out , the RH was down to 27 when I checked last night . I put a damp towel in there ,all I could think for immediate possible fix. I'm going to keep giving cal mag for now and sort the RH , hopefully they will make it .

 

[pop22]

you have a PH issue, not nute burn, and I've never seen low dose cql/mag cause this issue. You have what looks like potassium deficiency, which is also, mostly caused by PH problems.

Have you calibrated your PH meter recently?

Problem:fan leaves burning, oldest first then when new fan leaves get bigger they burn too . They were fine unit two weeks old they were nice and green ,then went pale yellow looking with slow growth. So I gave sensi cal mag at quarter strength and it burnt them. They swing between looking deficient to over fed burnt . There in a mixture of plagron bat mix and plant magic supreme. I checked pH of run off its 6.9 the rain water I give is between 6 to 6.5. They are in a garage with window shut 5 inch carbon filter with inline fan on low in a cheap 1m by 1m 2m high tent with small oil rad there have been several frozen days and the temp got down to as low as 16c . I can only check them every two days grow tent stinks of new plastic beach ball smell when warm.
-Medium/grow method: soil; plagron bat mix and plant magic supreme mixed.
-Feed and supplements used: tried to give them quarter strength sensi cal mag when they first started looking offl, it burnt them .
-Water source:rain water checked the PH it's around 6.3
-Strain and age Fast buds rhino Ryder two months old should be finished just started to flower.
-Climate: in cheap tent in garage , temps between 27c and 20c has dropped to 12 a few times winter weather. RH around 50 a few times 30 on cold days . 5inch inline extractor fan with rhino carbon filter
- Light used:, LED, mars reflector 96 and mars pro 2 80. 24 inch from canopy mostly.
-Additional info: started on third set of true leaves , leave s stared to look pale and yellow then burnt ,they seem to swing from looking deficient to burnt.New growth is ok large leave s burning and pale plants . I start with 3 plants then planted another 2 in different soil they were fine for 4 weeks now they are getting same problems. I tried checking pH , flushing media, keeping eye on RH and temp. Could being sealed in garage for two days be a problem . I even though tent could be gassing off I have all the symptoms. I don't have a fan in the tent either I'm getting one tomorrow. Never had a problem I can't solve before .

--Pictures

View attachment 851787 View attachment 851788 View attachment 851789 View attachment 851790 View attachment 851791 sorry about quality I'll take some with lights out and flash.

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Infirmary Staff aim to Answer your queries within 24-48 hours.

 

[pop22]

Its best to get pics under white light when you have plant problem, your burple lights can mask symptoms we need to see.

Also, nute burn starts at the tips of leaves, not the margins

Potassium def looks like this:

 

[henryface]

Its best to get pics under white light when you have plant problem, your burple lights can mask symptoms we need to see.

Also, nute burn starts at the tips of leaves, not the margins

Potassium def looks like this:

View attachment 852712

Thanks I'll definitely get pics with lights out tonight when I go out to check them. They do look a little better in last few days since using rain water with cal mag . And my Cheap PH pen is going to be calibrated with those powder packets.

 

[pop22]

Hope you get her healthy! I'll pop back in when you post.

 

[Waira]

oof! yeah, that some hard water alright,... a few rounds won't be too bad, but cumulatively, the build up of CaCO3 will force pH up, and blow what buffering the AN has away! And it explains the pH jump,... yes, hard water has CaCO3 in it, but no MgCO3 (or very little), and likely not in available forms,... it's mere presence doesn't mean it's in a form that can be taken up by the roots,... Good on the rain water! be sure to stay with the Ca-Mg, nice available forms in there...
Don't get pop22 started on flushing! You should read his Myth Buster thread on this, very good insights there,... ... But as mentioned, IMO, when it's do or die, a plant that's really TARFU, it may save it, but the quantity needed is at least 2-3x the pot volume, or it won't do much,... think of the soil as a coffee cone filter,.. as you pour though, the concentration at the bottm goes up and up untill you finally put though enough to purge out the loaded water,.. it's a pain, a mess, stressful to the plants, waterlogs the soil which messes with gas exchange (this is what overwatering does),... so as you se, if done, it's needs be done right, and fast, less than 20 min.,...
OK, all this said, that RH% is not good at all, and might be part of what's going on,... low RH stresses the plant, transpiration-wise,... that the evaopration of water through the leaves, and is what in part pulls the nutes and water up from the roots,.. if that shuts down even partly, the flow of nutes follows in kind,... you can get longer term defc. issue caused by this, even if nutes are present,... did you hang that towel so it's well open and exposed? More surface area to evaporate from,...
.. really need those normal light pics mate,... pop22 might be onto something, but I can't see well enough to spot K defc.'s classic margin "teeth" browning pattern. well enough to confirm.... longer term/ advanced Mg defc. will start wasting along margins though,... and if the Ca-Mg/rain water is helping, that might be the deal,...

 

[henryface]

Here are pics