Potassium Deficiency?

Setup

Lights - 1000watt HPS HID

Container - 3gal

Medium - Canna Coco

Co2 - Tank 1500ppm

Temp - 79/85 ^

Nutrients -
Week 1-2
FF Open Sesame, AN Sensi Bloom, Diamond Nectar, Prosilicate PH - 5.8 ppm 800

Week 2-4
AN Sensi Bloom, Diamond Nectar, Flora Nectar, AN Super Bud Blaster ( like Big Bud), AN Sensical PH - 5.8 PPM 1000

Week 4-6

AN Sensi Bloom PH - 6.0 PPM - 400


Started seeing problem around week 3 or 4. Started Flushin but it only got worse. Coco runoff is 5.2 and 2000 PPM. Tested coco with N-P-K test kit you find in hardware stores. It indicated lots of N and P and some K.

Is This normal for coco runoff?

What would be a good nuterient wioth lots of K but not much N-P?

What else could it be Is it nutrient overdose?

You got any pictures?

Here are pics

That looks more like a nitrogen burn to me.

Use some Maxicrop Liquid seaweed and some Cal/Mag nute, remove the yellow leaves, can leave on the
green ones with brown/rust spots. Should clear up in a week after flushed with those two items.

My guess this is happening mainly to the lower leaves, perhaps some brown/rust spots beginning
on mid to upper ones as well, but still greener above.

GL with it, it can be turned around.

Ok most of the plants have dark leaves and the edges look like the pictures above. The leaves then turn yellow and then brown, die and fall off. I have flushed the plants and the runoff is around 1000-1300 ppm but the ph is stil super low 5.1-5.3. Is this normal for coco runoff? It seems that this has gotten worse since I flushed. Doesn't liquid seaweed have tons of Nitrogen, Looking through the books I have it looks like K deficiency but I am not sure. Could also be nutrient lockout. Thanks for your suggestions. Do you think its cal/mag deficiency?

Anyone had similar problems? I checked coco with a N-P-K tester again it indicated lots of P some K and little N. Should I add N this late into flowering?

Ah you're "flowering" ok a little different situation. Thought you were still vegging.

In that case, the P needed by the plant to flower is being locked. Your soil is far too acidic for it to absorb the P.
Flush it really good with some R/O 7.0, add some dolomite to the soil to bring up the ph. It will stabilize the soil to 6.5-6.8
where you should be for the P to benefit the flowering. If you're already near harvest, just keep the dolomite in mind
for the next time you do a soil grow.

Hope it works out, GL with it

mrcameleon said:

Ah you're "flowering" ok a little different situation. Thought you were still vegging.

In that case, the P needed by the plant to flower is being locked. Your soil is far too acidic for it to absorb the P.
Flush it really good with some R/O 7.0, add some dolomite to the soil to bring up the ph. It will stabilize the soil to 6.5-6.8
where you should be for the P to benefit the flowering. If you're already near harvest, just keep the dolomite in mind
for the next time you do a soil grow.

Hope it works out, GL with it

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he's using coco, it shouldn't hold much ph, the lime would spike the ph. i grow in straight coco for my mothers and also small SOG setups, and i never use soil amendments. yes it is a P deficiency, but i would recommend flushing with ph 6.0 water with 1.5x the volume of the container, then test the runoff ph. then water with 1/4 strength nutrient solution and gradually bring it back up to full strength over the course of a few days. also, you didn't specify your feeding schedule. i recommend a feed-feed-flush schedule for coco to prevent nutrient buildup. your ph sounds ok for coco, as do your nutrient levels, so i would just change the feeding schedule for future crops.

Ok I will flush then when I add the nutes Should I add sensical which is cal mag supplement. I have heard conflicting things about adding cal mag in coco. Should I feed with the bllom booster too. Its called super bud blaster similar to big bud. Also I did check P content of the coco with a test kit from the hardware store. It indicated high levels of P moderate levels of K and low levels of N. Ph of Runoff is low around 5.2. I feed with a PH of 6.0 or so.

Looks like Calcium and Phosphate all the way. Maybe a few other things. Probably just those though as they bind for mobility.

Mocha Rocha said:

Ok I will flush then when I add the nutes Should I add sensical which is cal mag supplement. I have heard conflicting things about adding cal mag in coco. Should I feed with the bllom booster too. Its called super bud blaster similar to big bud. Also I did check P content of the coco with a test kit from the hardware store. It indicated high levels of P moderate levels of K and low levels of N. Ph of Runoff is low around 5.2. I feed with a PH of 6.0 or so.

Click to expand...

well calcium is needed by all plants, and you'll notice brown spotting during veg if you don't use it. your stems may turn purple and brittle as well. basically, calcium is used by plants to help strengthen cell walls. it's also used to help form new root hairs. you should definitely be using cal-mag of some sort if you're using r/o or similar low ppm water, or if you notice the brown spotting indicating deficiency. i personally don't use bloom boosters except for a few weeks during flowering, though some people use them for entire life cycles. i've only used AN once, and it was only the basic Sensi a+b, so i don't want to advise on a product i'm unfamiliar with as far as dosage or when to use it.

RRLBT, what ppm do you do with that feeding schedule of feed, feed, flush? I used to do that but since have changed to just feeding every time about 1000 ppm for mature plants and havent seen a problem yet, but maybe you are able to use higher ppm your way?

Ok I thought it might be Calcium deficiency. Its says on the AN Sensical Bllom bottles. It is not needed when using AN Sensi Bloom a/b but then again I am using R/O water. Do you think I should go Organic in the future? If so what brand?

Mocha Rocha said:

Ok I thought it might be Calcium deficiency. Its says on the AN Sensical Bllom bottles. It is not needed when using AN Sensi Bloom a/b but then again I am using R/O water. Do you think I should go Organic in the future? If so what brand?

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Hey Mocha Rocha,

Can you please let me know how you make out with this issue? I am growing in soil and I am having the exact same issue!! The pics you posted look like they could have come from my plants. If you could PM me when you get a fix I would appreciate it very much.

I don't wanna hack this thread by any means but if anyone has a fixed for this issue with soil I would love to hear.

Thanks Mocha!

C

I will let you know as soon as I solve the problem. There is only 2 or 3 weeks left until harvest. Not much time to fix it anyone else have any idea what it could be. I am thinking Calcium deficiency is the number one problem.

vito*magito said:

RRLBT, what ppm do you do with that feeding schedule of feed, feed, flush? I used to do that but since have changed to just feeding every time about 1000 ppm for mature plants and havent seen a problem yet, but maybe you are able to use higher ppm your way?

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i actually run my nutrients pretty light... only 800-900 ppm during veg, and i'll do 1100 max during flowering. in some setups the plants could probably use more food but i veg under cheapo shop lights so it would just be wasteful.

Mocha Rocha said:

Ok I thought it might be Calcium deficiency. Its says on the AN Sensical Bllom bottles. It is not needed when using AN Sensi Bloom a/b but then again I am using R/O water. Do you think I should go Organic in the future? If so what brand?

Click to expand...

personally i use Botanicare. they also have i line called organicare, but most of their nutrients are organic anyway. i have less trouble balancing ph than i did with AN, and overall the plants seem happier and seem to have better flavor. i also like that Botanicare is easy to use. i mix up a concentrate of all my nutrients so i can add from one bottle instead of 5, but you can't mix concentrates from AN or most chemical nutrients as it will lock many nutrients out.

RRLBT420 said:

personally i use Botanicare. they also have i line called organicare, but most of their nutrients are organic anyway. i have less trouble balancing ph than i did with AN, and overall the plants seem happier and seem to have better flavor. i also like that Botanicare is easy to use. i mix up a concentrate of all my nutrients so i can add from one bottle instead of 5, but you can't mix concentrates from AN or most chemical nutrients as it will lock many nutrients out.

Click to expand...

Are you using coco? My runoff is still a bit low (5.3) Even though I feed with 6.0-6.1 water. I am switching nutrients for sure.

Looks like a K def to me.

http://www.icmag.com/ic/showthread.php?t=11688

has a picture of a plant that looks almost identical. The calcium def looks more spread out. Good luck.