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Diagnose my plant issue?

Hi all,

Anyone know what's going wrong with my plant? Looks to me like potassium deficiency from what I've been reading but really not sure as this is my first grow.

Growing one Royal Jack auto in Plant Magic soil with Led light and have been using Canna Terra Flores  (5ml per litre) and Calmag (0.5 ml per litre) since flowering. Water pH 6 - 6.5,  humidity around 40% and temps between 23 and 28ºC.

Any help would be appreciated. Cheers!

 

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Posted (edited)

I will start with I don't grow auto's, but, that definitely looks like potassium deficiency. 

 

I don't use canna nutes but @blackpoolbouncer does and he does autos so hopefully he can give his input.

 

I should ask, are you around week 5-6 of flowering? 

 

Peace 

:yinyang:

Edited by Breezus
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Thanks for the reply.  I'm week 3 into flowering.

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5ml of Terra Flores is probably waaaaay too strong. 

 

My last photoperiods grow never went above 3ml pl and that was strong.

 

I'm betting all your tips are burnt, especially new growth? 

 

Full plant pic would be nice but I'm betting that's what's up. 

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Humidity could be a bit higher too, but that's not your main issue.

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Cheers for the comments guys.  Old growth is affected more and it is taking new leaves several days to display brown tips which indicates deficiency rather than overfeeding right?  

Humidity could be higher but I've been reading that 40% is about the lowest acceptable level. Is that correct?

 

Hopefully this pic is a little clearer.

 

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