Can anyone ID this problem please - is it mag deficiency?

GreenGro · #1 07-10-2007, 10:16 AM

Can anyone recognise this problem please? not sure if it's magnesium deficiency??

GraF · #2 07-10-2007, 10:20 AM

looks burned to me- I could be wrong but we could give a better answer if you give us some details on your soil and nutrients

GreenGro · #3 07-10-2007, 10:25 AM

Quote:

Originally Posted by GraF

looks burned to me- I could be wrong but we could give a better answer if you give us some details on your soil and nutrients

Canna nutes in rockwool and clay pebbles - it seemed to start after being in the same nute mix for about a week and a half - it was dumped after 2 weeks and the nute mix increased to EC 1.2 or about 600ppm as per the bottle.

2 Days before it started happening cheap CO2 was added delivered under the leaves with straws from a big bottle dunno if that could have any bearing?

Also the leaves had been curling up along the sides for some time before this, that with the yellow tips made me think it could be mag. def.

thanks for the help

SHOOT2KILL66 · #4 07-10-2007, 12:15 PM

If you ph check your water then its nutrient burn

GreenGro · #5 07-10-2007, 12:25 PM

Hi thanks

PH is about 5.6

So its a defo nute burn then? What is the solution, flush with plain Ph'd water for a few days then half the nute strength?

SmokerE · #6 07-10-2007, 12:46 PM

What's the E.C./PPM?

recvryjst42day · #7 07-10-2007, 01:42 PM

Quote:

Originally Posted by GreenGro

Canna nutes in rockwool and clay pebbles - it seemed to start after being in the same nute mix for about a week and a half - it was dumped after 2 weeks and the nute mix increased to EC 1.2 or about 600ppm as per the bottle.

2 Days before it started happening cheap CO2 was added delivered under the leaves with straws from a big bottle dunno if that could have any bearing?

Also the leaves had been curling up along the sides for some time before this, that with the yellow tips made me think it could be mag. def.

thanks for the help

This is his E.C. 1.2

SmokerE · #8 07-10-2007, 01:47 PM

What kind of nutes?

GreenGro · #9 07-10-2007, 02:02 PM

Canna substra - not sure if e.c was quite 1.2 but I know PPM was around 600

babygro · #10 07-10-2007, 02:02 PM

Quote:

Originally Posted by GreenGro

Hi thanks

PH is about 5.6

So its a defo nute burn then? What is the solution, flush with plain Ph'd water for a few days then half the nute strength?

Firstly, I'm not a hydro grower, I'm a soil grower.

Secondly, that does look like Mg deficiency - it's quite mild though from the looks of it. I don't really understand why you're getting deficiencies in hydro unless your ph is simply too low for the amount of Mg the plant needs. I think I'd raise the ph to about 6.4, 6.5 for a week at least and see if the plant starts to improve. If it doesn't, you may have to foliar feed a Magnesium sulphate solution (Epsom salts).

It doesn't look like burn to me, your third picture clearly shows the plants leaves paling between the veins - that's not a symptom of over-fertilsation and in anycase that EC is not high enough to burn the plant in my opinion.