Another help with my Leaf problem ;)

[Frank M]

Having a small problem and looking for some advice on the issue I am starting to have with my leaf tips.
First I thought Nutrient burn but now I am kind of leaning to a Potassium deficiency.
Trying to fix it before it does any more damage
Problem: Leaf tips turning yellow to brown
Medium/grow method: Miracle Grow soil mix
Feed: and supplements used: Minor 2-3 ml’s per Gallon of GH flora series used because of fert. In soil mix
water source: Distilled or PH'ed Tap water
Strain/age: Female Seeds: Auto Speed Bud 50days
light used: CFL 150w eqv. and A19 LED 9w grow lights - 2 of each
Climate: Basement - low humidity 40-50%, cool temps 60's F

 

[Waira]

-- yeah, looks K related to me too, but early stages,.. the tell is the burning on the margin "teeth",... problem is, with K, both defc. and toxicity look similar! .... MG soils are dubious, for the added nutes and pH,... it's a fairly hot soil I think, but you nutes aren't excessive, so the call is kinda tough here,... Do you have a TDS/EC meter? Checking run-off ppm/EC can offer a clue,.. also, the in-pot pH is vital to know,.. if you have a simple lack-of or a lockout due to off pH,... best thing for this is a quality pH probe, like the Accurate 8,... otherwise, it's the iffy run-off test; we have an improved method and calculation here in the highlighted section above this one,... it's a pain to do, but better than testing just straight run-off,.. that's very crude, but may still offer at least a hint at if the in-pot pH is badly off enough to lockout K,... problem is, if you add more nutes when uncertain, it may make matters worse, not better,...

 

[Frank M]

Thanks will try and check the run off since I don't have a soil tester

 

[puggle6]

Could partly be your cool temps!

Are your pots on cold concrete? If so maybe put them on pot stands.

f6

 

[Frank M]

Could partly be your cool temps!

Are your pots on cold concrete? If so maybe put them on pot stands.

f6

5 gal bucket on a piece of carpet with a heat mat wrapped around bucket on a timer soil temp in mid 60's F

 

[Waira]

-ah! good call F6 mate, if that's the lights-on temp then it'll slow the absorption and movement of nutes down, transpiration rates being slower than usual too,...

 

[Frank M]

mat for bucket set to go on for 1hr, 5 times a day to keep soil warm.

Hate cold basements checked actual air temp way to cold so I got a small heater for the area hoping that will also help because it has been growing kind of slow
hopefully will have time later today for Ph run off test.

if Ph is OK and warmth doesn't help it, is advised to do a low dose Foliar feeding of "K".

 

[Waira]

...no need if you warm it up in there some and get some air movement- ... here's the deal: transpiration, the evaporation of water from the leaves, causes a drawing effect from the roots up,.. along with water, nutes are moved as well... slow the rates down, and nutes don't get moved either,.. also, low temps affect absorption of many nutrients at the roots,... so if you warm it up in there, likely this all will be fixed! Watch the newer leaf tips for nute burn as you start to feed more; MG soils don't have a goof rep', with the nutes in them, and general quality issues including off pH,... If the soil is still pretty wet, skip the pH run-off test for now, and see what the warmer temps show,... if it was that bad in there, other symptoms would likely started to show as well,...

oh crap, I didn't see this before-- the age of this plant! Sorry- .... Ok she should be well into bloom by now,...especially for a "speed" bud -- ... She has shown sex, right? I'm afraid this one isn't going to autoflower, and will need to be treated like a regular photo' plant- ... that means going to 12/12 ASAP,... Could be a packing error, or a rare "misfire" in the genetics,.. this happens on occasion... I would still tag Female Seeds rep' Gennaro here about this....

 

[Frank M]

oh crap, I didn't see this before-- the age of this plant! Sorry- .... Ok she should be well into bloom by now,...especially for a "speed" bud -- ... She has shown sex, right? I'm afraid this one isn't going to autoflower, and will need to be treated like a regular photo' plant- ... that means going to 12/12 ASAP,... Could be a packing error, or a rare "misfire" in the genetics,.. this happens on occasion... I would still tag Female Seeds rep' Gennaro here about this....

Plant seems to like the Little heater I got, Tried the run-off test, screwed up something there plant should be dead according to the soil Ph reading of 3.7 (input 7.1 output 5.4)

Yes the plant is female, It is also my first try at an auto ( done a few photo outdoor grows before that worked well) been wondering about budding hasn't really shown much of anything was leaning towards being to cold and slowed it down. Looking at all the pic's posted it is way late on blooming today is Day 57 thanks for the idea of tagging @gennaro-fs to see what he thinks. Guessing 12/12 will be the way to go

 

[Waira]

she's a lovely gal, just stubborn about blooming,... go 12/12.... Oh crap, yeah something is amiss with that reading! now you see why I hate the run-off testing- -- that plant would be a smoking wreckage if it was 3.7 in there,... and no signs of trouble on the plant, so that's a big tell right there! Check your meter for calibration, 7.0 and 4.0,.. are you storing in the proper solution? This is critical BTW,... that glass electrode is a damn trick device, made of layers of hydrated glass (allows ion exchange), easily damages, knocked out of calibration,... Get yourself an Accurate 8 soil pH probe, and you'll no longer be guessing!