Leaves Browning in flower..... pls help

Indoor Grow
Strain: Church from Greenhouse Seeds
Light: 250w metal halide
Media: Canna Coco
Nutes: Canna Coco
Week 6 of flowering

Hey all you growers.
I am now in week 6 of flowering, and i have noticed some browning on the edging of the leaves along with the fan leaves yellowing a little bit, only at the top of the plant. I noticed this on my last grow, and it gradually got worse, but the end result proved OK. However i would like to prevent it this time. After doing a little research i have come to the conclusion that this could be a deficiency in Potasium? With the nutes i have, there is a PK13/14, which is a potasium booster and the nutes chart from canna only says it should be used for the one week during the early stages of flowering. I added this into my feed about a week ago, only noticed browning today. So could this also be not over fert maybe?

Was also thinking it may be overfeeding with N? But not sure hoping you pros will be able to help me out......?

My current feed per 10ltrs is:
A&B - 25ml
Canazym - 15ml
Rhizotonic - 5ml
Boost - 15ml
PK13/14 - 15ml
I always keep my PH at 5.8.

My first feed with this mix was 1week ago, the first feed was a good watering with 20 to 30% to drain. I then watered again 3 days ago, but this time with no drain. And then i have watered again today

I usually water it with a good flush (drain), followed by 3 or 4 feeds with no drain, then do a full water again. I usually leave the water until the top couple inches of media is dry and also feel the weight of the pot.

Also on both my grows (only done two so far :smile: ), it seems to take a very long time for the vegative stage. I have attached my excel log sheet. Any ideas? I am thinking i may be overnuting as i was sticking the the ammounts of the canna coco website at first.

Also when pruning, (didnt prune on last, but have on this) should you not feed the same or next day, my thinking is this may cause my little plant stress while its still licking it wounds?
 

Jtoth3ustin

Well-Known Member
magnesium def. or calcium. i havent gotten that ever since ive started using botanicare's Cal/Mag. so i cant remember which but its one of the two... certain of it. Pe@ce.
 

KlosetKing

Well-Known Member
magnesium def. or calcium. i havent gotten that ever since ive started using botanicare's Cal/Mag. so i cant remember which but its one of the two... certain of it. Pe@ce.
my personal experience has been that the cal/mag def show with taco shaped leaves and more random of brown spotting.

i would personally say this is more closely related to a Mo. deficiency, due to the purpling/browning on the edges, but not positive. Depending on the strain, at 6 weeks flower this with the yellowing of leaves very well could be just natural aging. The pistils don't seem to reflect that it should be this close yet though. Check your trichs and see how fast these signs are showing up. If it is coming on VERY slowly, its probably aging. If its happening really fast, it could be the deficiency.

-edit- i am also not very familiar with coco grows, so iam not sure if this could be a pH lockout related problem or anything.
 
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