Is this a calcium def

[ShroomDr]

Im at day 40 of flowering here is a leaf.

I have only changed the reseverior 3or 4 times in the 40 days. Once at the start of flowering, once after about 8 days (to remove the Bud Blood) and i might have changed it when I added the screen (i can't remember ) at day 14 (Again i think it was day 14 ).

I was just topping off the rez, and adding a little bit of LK, Sweet, Bloom Booster, always watching the ppm.

Well i changed the Rez 2 -3 days ago and now have this problem. It seems to me that its only appearing on the oldest fan leaves, and not on the leaves coming out of the top of the buds.





After checking the sticky, i think it is probably a Cal def, maybe a Manganese. I had the PPM at 1750 (on the Hanna .5 scale) before i changed the rez, now it is at 1300.
PH has always been 5.7-6-2

Here is the total garden.




Can someone tell me if it's calium or not? I'm pretty sure that i used Cal-Mag when i changed the res, and i am using tap water (with a ppm of 220 out of the faucet).

I hope ive given enough info for a diagnosis.

 

[sproutco]

Calcium def. would show up on your new growth first because it is not mobile in the plant and would stay in the older leaves. It usually burns margins and edges. I think your ppm's are too high. Sometimes with a toxicity/salt burn it shows up in the older leaves. I think 1000 ppm tds should be plenty of ferts. for your flowering plants. You want to reduce your ppm to 400-500 during the last 2 weeks of flowering (I got the ppm info from the overgrow faq's)

 

[ShroomDr]

too high huh.

well after i topped off today the ppm is at 1000. I was waiting to hear some anwsers before i adjusted it.

Also, i was vegging at about 800, and started flowering at 1300. They were loving that. I didn't think 1700 would be to high.

Here is a better pic (hopefully)

 

[sproutco]

Maybe too many metals maybe like manganese or iron. You should really change your water out completely every 2 weeks or so. When adding back nutrients to top off you should probably not include micronutrients(if that is possible). Really the only thing you should be adding is potassium and nitrogen. You need to make sure that your nutrient solution contains everything when first made: nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, zinc, copper, boron, and molybdenum. The only deficiency that this could possibly resemble is potassium. You don't want more calcium and magnesium than potassium. Potassium to calcium 1.5-2:1 and calcium to magnesium 3-4:1 Check out figure 2,3, and 4 of nutrient burn: http://www.newovergrow.com/faq/faq/97.html

 

[ShroomDr]

ok, so should i flush (BTW i am using all Botanicare products, except the bud blood) with clearex or will the 1000ppm (and ill let it drop more) be ok?

 

[sproutco]

If the plants are in some sort of medium like hydroton then giving them a good flush with just water every once in a while is probably wise. If they have no medium and are just sitting in aerated nutrient water, then flushing would have no point. Leave them at 1000ppm and see what happens. You sure have some large flowers forming. Not too bad off really. How big is your light? In the photo the light seems to be dim with not much of the lower branches getting alot of light. This would be another reason to have lower levels of nutrients.

 

[ShroomDr]

250HPS

The plants are in rockwool and a DWC.

I'll report back tomorrow with the ppm (its dark time right now)

 

[sproutco]

Just for interest... here is what typical calcium deficiency looks like. These huge tobacco leaves make it easy to see. Notice that the leaves are: burned at the tips, cupping downward, and distorted in shape. This only affects the top leaves. http://www.ipmimages.org/images/768x512/1402096.jpg (photo from the University of Georgia)

 

[Azra3l]

Hi,

Yeah, I think that you 've a calcium deficiency through too much magnesium. The leaves have a strickingly overall dark color probably due to an exces of magnesium and thus a calcium deficiency....


Cheers

 

[MynameStitch]

Yes i would say your plant looks like it has to high of ppms, thats not a calicum deficiency, where at on the plant did that leaf come from?
your plants are not really big so ppms shouldnt be very high, the bigger the plant the more the plant can eat.... always remember that

i woulda kept your ppms no less than 600 and no more than 800
flush your system out with water and add around 600 ppms of nutes and work your way back up to 800 in a few days

since they got alot of food you dont want to just add the max ppms wait a few days before adding that much more, ease the stress and not to mention they have excess

 

[ShroomDr]

800 to high?

I did not have ANY problems durring the first 4 weeks of veg @ 1300 (.5)

I understand that maybe 1750 is too high. but 800?

 

[MTF-Sandman]

Looks like nute burn to me as well...has ANY of the environment changed any since the last run? Changes in ventilation, PH, humidity, temps or additives could effect the way the nutrients are uptaken by the plants...

BTW, my plants usually burn at around 700-725ppm using FF nutes with RO water, CalMag, Liquid Karma & Banana Manna...

 

[ShroomDr]

Here is an of-site pic. If you click on it, and then click on the larger image, you will see the full image.



There is a Bic lighter in the jungle for reference.
Some of the leaf damage is about a lighters lenght to the right of the lighter. I don't think the damage is extesive. It seems to be located on the fan leaves at the base of the colas.


I checked the ppm right before i took the picture, and it was at 1130.


Now according to my logic

the H2O in the reseverior is being consumed or evaportated faster than the nutrients are being used.

ppm was 1000 yesterday and today it was 1130.
After i topped off it was at 930, i'll check it again (like always) tommarrow.
I expected it to be a little lower than the 1130 i had today.

I think the plant could have handled the higher ppms if i was not removing the undergrowth.

forget the calcium def.

Thanks for the help.

Here is a link to the grow log.
http://www.icmag.com/ic/showthread.php?t=30964

Could some people please now comment on the damage?

Is it bad enough to effect yeild?
As stated this is day 40 of flowering.

How does the garden look overall?

 

[sproutco]

It is not really how many total ppm tds you have but what is in them. If your ppm tds is high from potassium, for example, being in the nutrient solution then no big deal. Plants can tolerate alot of potassium. If you raise your ppm tds and the micronutrients are a fixed % of your fertilizer (higher ppm tds=more micros) then this could lead to too many metals such as manganese.

Remember to include everything in your nutrient solution and adjust ph.

Plants operate on the law of diminishing returns. When the plants are deficient, adding fertilizer makes them grow more. At a point, adding more fertilizer slowly starts to have less affect. Then a luxury level is reached. After the luxury level is reached, adding more fert. actually may reduce growth/bloom.

Looks like you got large blooms. Not bad overall. It takes alot of trial and error/experience to get perfect plants.

 

[MTF-Sandman]

I checked the ppm right before i took the picture, and it was at 1130.

Now according to my logic

the H2O in the reseverior is being consumed or evaportated faster than the nutrients are being used.

Correct...lower the ppm's until you find that magic balance of H20 usage and nute consumption and you'll have some happy plants.

As far as damage, a few leaves under the canopy are definitely nothing to worry about. It does look like there was a mild excess of nutes from a while (burnt tips on leaves) but again...nothing serious to worry about.