spotting diagnosis

[bgrt]

hey so first day of flower day 69~ overall. ive got brown spots on a few leaves on my white siberian photo. im no good at diagnosis so if someone would tell me what they think this ould be that would be great.
ph seems stable around 6.5 maybe a touch lower if anything but not much, im using ph'd tap water and have no ppm/ec meter,
nutes im using are gh 3 part flora feeding at around 1.3x strength of the guidlines of the drain to waste on the GH site.

from troubleshoots and some pictures it seems like it could be calcium, manganese or potasium but as i said im bad at that.

temps stable around 77f lights on 68off
600watt hps

there are also light tips on some leaves but im pretty sure thats from hitting off some t5s a while back though maybe not.
this plant had similar spots as a seedling.
i have garden lime, canna magnesium, various nutes, pk 13/14 seaweed and lots of other random stuff. ill order something if needed.

see sig for more details if needed or i should be on all night anyway.
any help appreciated.
cheers

 

[Gandolph420]

I would maybe back off slightly on the nutrients, I use the flora series for my photo grow aswell and at week 5 and week 8 I do a mild flush just to get rid of mineral build up. With a constant 1.3x strength mix over time it builds up.

You shouldnt be getting many deficiencies at that strength of a mix...if anything maybe supplement some CaMg+

just my .

Goodluck sir!

 

[bgrt]

hey gandolph, about the calmag supplement, i find it very hard to find online in europe so i bought the canna mono magnesium 7%MgO, im assuming i have calcium in my water as its tap water and while probably not hard its not 0ppm etc. would a shot of magnesium in a plain ph'd feed be an idea?

hxxp://www.greenshorticulture.co.uk/categories/Plant-Nutrition/Canna-Nutrients/Canna-Elemental-Additives/?search_query=canna%20mono

 

[Hugo]

Yep, it's important to have a flush now and then

I'm more inclined to Ca def. Main reason would be because I don't see osmosis in leafs. If soil is too hot in salts water would start to withdraw from the plant back into the soil. Nasty stuff (been there allready). That said, I don't understand why NPK is not NPKCa as Calcium is very important for the plant growth, in about the same quantities as N. At this stage of pre-flowering she'll boost up growth so I would give a foliar Cal/Mg.

I recently had the same situation with my auto-BB, and I fixed it like that.

bgrt, you were spot-on in time. Good call as it's only the early signs.

 

[bgrt]

how do hugo, i will lay off the feed, i dont even think it was there yesterday, i stare at them much too much, that is my only strength.
i looked last i was ordering stuff for calmag and couldnt find it in any european shops, will it be here quick enough from some random american hydro shop or can some european ppl post me a link if they have bought online. shops here are shit and wont have it guaranteed.
any other things that could be used for calcium in the meantime? garden lime? random guesses not gonna try and chuck things on tonight just curious whats the best option here...

 

[Hugo]

I'm not Gandolph, but I wouldn't recommend that.
You need Ca, not Mg. A usual composition of a cal/mag would be something like: 5% N, 5% Ca, 0.3% Mg. Get the idea?

 

[Hugo]

Garden lime would be your best bet. It's slow acting though, unless it's hydrated lime (then it's faster). Have you checked eBay.UK?

 

[Hugo]

http://www.an-europe.com/SensiCalGrow.html

http://www.an-europe.com/SensiCalBloom.html

I only use sensical grow.

 

[agito]

hes running 3 part flora he should not be raising the ph from 6.5 if its the 3 part is there not a micro you can use to raise Ca?

 

[bgrt]

the gh i was told is fine for soil just use the drain to waste amounts but maybe i have been misled? when looking it up everything said it was fine but lots of misinformation out there..
there is a micro, would upping that help?

cheers for the links hugo, found some stuff on ebay for the future if not needed now anyway.