Deficiency Problem- Any Ideas?

Soldier25k

New Member
Needed some good advice and thought I'd FINALLY sign up so I can post!

I have always found these forums to provide helpful reading material, and they have assisted me well over the years- but I've never had an issue like this before and a little help is required.

Okay, so I left a few girls (1 x White Widow. 2 x Hindu Skunk) vegging in the same pots for a little longer than I should of, and they look like they started to developed a pH def. or nut. problem.

3 weeks ago I moved them to larger 20L (3 gallons) pots and mixed in gardeners lime to the soil to try and correct the problem- and that seems to have amended the ph issues- it now tests at around 6.5.

Once pH was corrected, I gave them small amounts of phosphorus and potassium- the after about 2 weeks the Skunks showed improvement and are now almost back to normal. But the White Widow still doesn't look her best, and I'm unsure what the problem is.

It's hard to say whats wrong as all 3 of the plants displayed slightly different symptoms- Skunks displayed an overall yellowing/lime green colour, and purpling of the leaf stems and main vein. While the Widow had clawing and rusty brown spots, and the yellowing was more leaf specific on her.

While most of the clawing has now been fixed, several leaves on the Widow continue to develop yellowing (starting at the tip and moving back) with random brown spots on the affected leaves- while other leaves on her look like they are getting better.

I originally thought it was a nitrogen def. but now I thinking may be a problem with potassium, or possibly magnesium- and I'm thinking that treating her with epsoms salts might be what she needs.

Any advice on what it could be would be very much appreciated.

Thanks in advance guys!
 

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Soldier25k

New Member
Yeah but I've been driving myself crazy trying to work out what it could be!

Over the last few weeks I've been reading whatever info I could get my hands on regarding deficiencies- but the solution still evades me because she seems to display some very common problems.......

I've never had any problems with pH or deficiencies before, and I've grown indoors and outdoors for several years now- the only difference was they became root bound because they were left in small pots longer than usual due to a lack of space.

Any ideas or suggestions?
 

Soldier25k

New Member
Yeah I though it might be a Fe Def for awhile too but the problem seems to randomly affect all parts of the plant, not just the young leaves....... So I'm inclined to think it's Nitrogen or

If I decide to treat with epsom salts by applying to foliage+soil, how long before I see any signs of improvement that would confirm it was a mag def? Or should I just wait for the gardeners lime I added 3 weeks ago to start working? Even though it was fine grain, I still think its to slow acting to make a noticible difference anytime soon.

Cheers for the input Nitro- another opinion is just what I need right now......
 

churchhaze

Well-Known Member
It does look like it has Fe or S deficiency, but that could be old damage from pH imbalance. It's hard to tell S and Fe deficiency apart because they're used for the same protein, ferredoxin, part of one of the plants photosystems.

Epsom salts (magnesium sulfate) wouldn't necessarily confirm a magnesium deficiency even if it fixed the problem, because it actually has more S by mass than Mg.

Fe deficiencies are almost always caused by pH lockout, so if that's fixed, the problem should go away.

calmag is in no way "better" than epsom salts, btw.. They're just different. One is calcium nitrate and magnessium nitrate with iron chelates. The other is magnesium sulfate.

Yeah I though it might be a Fe Def for awhile too but the problem seems to randomly affect all parts of the plant, not just the young leaves....... So I'm inclined to think it's Nitrogen or

If I decide to treat with epsom salts by applying to foliage+soil, how long before I see any signs of improvement that would confirm it was a mag def? Or should I just wait for the gardeners lime I added 3 weeks ago to start working? Even though it was fine grain, I still think its to slow acting to make a noticible difference anytime soon.

Cheers for the input Nitro- another opinion is just what I need right now......
 

yesismoke

Active Member
Mist the leaves with epsom salt 1tsp to gallon make cup of warm water add the1 tsp to cup then dissolve the salt then add to gallon ph then spray them lights off or in the night cal mag works to but why had calcium when you dont need it thats just me but it good to use it for prevention of calcium problems i agree and use cal mag alot its also good find a nutrient availability according to ph charts calcium and magnesium
 

Soldier25k

New Member
Yeah I ended up with one of those messy soil test kits and it sucks...... I suspect it's inaccurate so I do multiple tests on different parts of the soil and it usually comes out somewhere between 6-7...... But yeah, a better pH test kit is definitely on the shopping list!!
 

Soldier25k

New Member
Hmmmmm, well seeing as the Skunks only started looking better within the last few days then maybe you're right and I should just leave them and see how they improve over the next few days.....

But yeah I'll apply some cal/mag in the next couple of days if they don't pick up......

Haha, this is the third time I've grown these two strains and the Widow has always been quick to show signs of distress at the slightest change in her environment, while nothing seems to bother the Afghan strain......
 

Fresh 2 De@th

Well-Known Member
Yeah I ended up with one of those messy soil test kits and it sucks...... I suspect it's inaccurate so I do multiple tests on different parts of the soil and it usually comes out somewhere between 6-7...... But yeah, a better pH test kit is definitely on the shopping list!!
yeah i kind of figure that.

the best way to test for your ph is to have it tested or take a sample of soil near the root zone, sit it in distilled water, stir and wait for 30 mins.

if anything, i would let the medium dry out a decent amount and flush with 6.5 water or low nute solution to rectify your issue. if you decide to flush with just ph'd water, i would foliar feed with a tea or a low based nute solution later on in the day.
 

topfuel29

Well-Known Member
Take a look at the charts. They should help you.
IMO- Calcium, Magnesium, Potassium deficiencies.



Good Luck on Your Grow. :weed:
 

Soldier25k

New Member
After all the headaches the last few weeks I was considering getting one of those expensive little electronic ones- but I'm trying to avoid it if I can so hopefully I'll get everything sorted out over the next few days

Apart from having my soil tested and the (expensive!) option above, is there a better way to test the soil?

Yeah I watered them all this morning so they'll dry out over the next couple of days- and I'll flush them soon unless things drastically change for the better over the next 72hr....

Check out the 3 of them - they've seen better days unfortunately but I this thread has actually given me lots to think about.......

S1.jpgS3.jpgS2.jpg
 

Soldier25k

New Member
Cheers mate- I've managed to get by without any drama- and if there is ever anything I'm unsure of I just jump on here and can usually find the info I need by just reading the posts- but this one just stumped me and I finally needed to sign up, throw up some pics and ask for some help- and damn, I couldn't be happier with the input I've got from everyone today- it's definitely given me lots to think about! Hell, I should've signed up years ago instead of just watching from the shadows!

:p
 

Fresh 2 De@th

Well-Known Member
from the recent pics, they look like they're regaining their color back. it looks like they're back on the right track.

as for testing the soil's ph, like i said, buy a gal of distilled water, take some soil out near the root zone and sit it in there for 30 mins. once the 30 minutes are up, test it.
 

Soldier25k

New Member
from the recent pics, they look like they're regaining their color back. it looks like they're back on the right track.

as for testing the soil's ph, like i said, buy a gal of distilled water, take some soil out near the root zone and sit it in there for 30 mins. once the 30 minutes are up, test it.
Yeah the Skunks are tough as nails and have given me no trouble whatsoever over three generations...... The Widow is a fussy one and has been difficult in comparison, but I don't want to lose a good strain so I try to keep her happy.......

So as for the actual test kits, is there something better than the soil kits- is there any way I can use a water pH test kit like they got for pools- I reckon I could get a way more accurate reading off something like that..... I found it hard to compare the colour accurately after mashing the very dark soil in with the purple dye indicator and the barium sulphate....... After lots of testing, I'm pretty confident that I'm "pretty" close to where I need to be with my pH- but so hard to nail down exactly with the poor equipment- but I'll try soaking the soil in the distilled and see if that works better.....

Cheers for all the solid info mate :)
 

Fresh 2 De@th

Well-Known Member
assuming that you have a ph meter or ph testing kit, here's your answer:

buy a gal of distilled water

take some soil near the root zone and place it in a cup of distilled water

stir and let it sit in there for 30 mins.

once the 30 minutes are up, test it with you ph testing kit or ph meter.
 
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