any ideas what this is

this is only affecting the fan leaves and its on most of them, its not on any other leaves there all nice n healthy.
im 3wks into flower.

25 litre bubbler ph 5.8- 5.9 greenhaze bloom and using pk13/14 cf/ec 34
light 600w , day temp is a lil high but hey its the summer 85f-88f thats at the tops under the bulb , ambient temp in grow room is 80-82f

iv looked at all the deficiancy tables and cant work out whats wrong..

You have a mg def.
With the lilited info you provide, I can only tell you to supplement with Cal-mg @ 5-10ml/g

Kind

Thanx for the help

unity said:

You have a mg def.
With the lilited info you provide, I can only tell you to supplement with Cal-mg @ 5-10ml/g

Kind

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i second that, mg def

View attachment 1724186

Sure looks like a mag deficiency to me too, Peace

again guys thanx for poppin in and helping... i dnt have anything here to sort the mag deficiency so any suggestions on what to get or do.?? its gona be a couple days till i get money

i have another question for you guys..

you say i hav a prob with mag def so if i raised the ph to 6.0 wud this sort the problem.?? im only asking because its only been in the last week and a half that ive had my ph higher than 5.6-5.7 ,its now 5.8 ans as mag isnt available at that range do you think thats why im experiancing the deficiency. on the chart i will post it shows mag is clearly available from a ph of roughly 5.87 - say 9.0. if the ph was raised to say 6.0 would this resolve the prob..

and thanx in advance to all that leave suggestion..

i wouldnt change the PH i would just know to supplement with some cal mag occasionally.

Yer both mag and calcium can be locked out by many things but dont know much for your situation as i only grow in soil, we use epsom salts which is pure magnesium and dissolves in water, your situation may be different but is definatly mag def. Try the pH then try a mag supplement. Need someone who can grow hydro to advise futher. Good luck dude

Leave your PH. It is in range to absorb Mg. Try and get some Epson Salts from a pharmacy. It's dirt cheap and does the job!

thanx again will get epsom on tuesday...

so what causes the deficiency= low ph ????

29menace said:

so what causes the deficiency= low ph ????

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Yes, low PH will lock out Mg. Can also be caused by not having enough Mg in your base nutrient or the use of distilled or RO water. Also excessive potassium, calcium and phosphorous will make it difficult for plants to take up Mg.

ive been addin pk13/14 for the last week so do you think it cud be causing probz in the rez.? if so wud you recommend emptyin the rez and starting again with fresh nutes without the pk13/14 and having the ph set to 5.9-6.0 ??.. soz for all these noob like questions.. just concerned about my ladies lol...

29menace said:

ive been addin pk13/14 for the last week so do you think it cud be causing probz in the rez.? if so wud you recommend emptyin the rez and starting again with fresh nutes without the pk13/14 and having the ph set to 5.9-6.0 ??.. soz for all these noob like questions.. just concerned about my ladies lol...

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You can try that. I'm still experimenting with pk13/14 at the moment so my opinion on it is limited. Thing is when I add it to my base nutrient it seems to keep the ph in check and stable quite nicely. How much of it have you been using?

Dudes a high p/k can lockout cal maybe mag, the calcium precipitates out of solution as it binds with the phosphorous, not sure if this is relevant though, i never use big flowering boosters though so never seen this happen. Peace

iv been using quite alot of pk , maybe 30-40ml in the 25litre each feed. my ph can be stable at times but does lower if unchecked for any length of time. today i will completely change the rez and i wont add the pk just to see if this makes any diff... maybe it will n maybe it wont but its worth a try...

thanx guys...

right thats the tank changed n ec/cf lowered from 36 - 30 ph 6.0 , didnt add any pk this time and will give them a few days on this n see wot happens.. will update in a day or 2 peeps..