Yellowing leaves - advise please

**desison** · 26-09-16, 04:39 PM

Hi All,

I'm having a problem with my first grow. The leaves are all starting to go yellow and brown. Does anyone know from looking at this picture what the problem could be? I have 4 plants and it's affecting them all to a certain extent but this picture shows the worst.

Some details:
7 weeks into flowering
PH level: 7
Compost: Verve multipurpose with perlite mix
light: 600w HPS
strain: Armageddon
Current grow: 6 weeks in veg, currently in week 7 of flower
additives used and how often for soil: Canna terra flores (NPK 2-2-4), used every 3rd day
temp range: 17 – 20 c
humidity ~60%
has it been repotted? and when?: Yes - after week 3
pot size: 25cm x 25 cm
plant size: 80cm

Click image for larger version.

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**Bud Lightyear** · 26-09-16, 04:52 PM

When you say Ph 7, have you been adjusting your feeds Ph ?

Regards BL

Dr-Chronic · 26-09-16, 05:23 PM

this happened to my big buddha cheese mate, i presumed it was ph inbalances within the soil, but i never adjusted the ph sometimes it can cause more harm then good mate, a good soil will buffer its self

Clunge Muncher · 26-09-16, 07:04 PM

Not another one ph'ing in soil

.

**desison** · 26-09-16, 08:05 PM

I haven't been adjusting the Ph as I thought it was within the acceptable range (albeit, a little high). Do you think I should try and bring it down?

Clunge Muncher · 26-09-16, 08:26 PM

No...... no need to Ph in soil, a good soil will buffer it for you..

From me phone enit

**desison** · 26-09-16, 08:43 PM

I thought it might be a potassium deficiency - any thoughts?

**Bubonik Chronic** · 26-09-16, 09:16 PM

Im not 100% what your problem is but as a start id give em a good flush then half the nutes your using for a week or two and see how things go.

Viz · 26-09-16, 09:21 PM

Hello mate, soil pretty much does not need any Ph regulation at all. What can happen if you have been doing plenty feeding is that your medium has become nutrient locked. What that means is your substrate has been over fed.

Correct dosage is important because using too many nutrients can cause nutrients to build up in the growing medium and eventually saturate it, locking out the nutrients. (This is more common when using salt based fertilizers as the salt can build up in the soil and change the soil’s pH, but can also happen with organic nutrients.)

**Hippy Crack** · 26-09-16, 09:28 PM

I would just water from now, seven week into flower so too late to bother about problems.

Nearly chop chop time 👌

https://www.thctalk.com/cannabis-foru...-Bud-Lightyear