Week 5 of flowering, brown spots and dying leaves. Need ur help please

[ofgoz222]

Hi,
It's my first grow in soil, I'm in week 5 now of flowering.
Mainly white haired buds now and very small areas have brown/yellow color so there is more way to go.

My problem is that my plant have some leaves with small brown dots and most of the leaves are burnt tips that go upwards (from last week).
I had before some leaves with brown small dots(even in veg period), mainly on big bottom fan leaves that eventually turn to yellow and die(I thought that not too much light so this is the case), but it's spread out quickly in the last week and I see more symptoms like:
- Purple stems of fan leaves on top get more and more.
- Small brown dots increased on leaves and also came up.
- Top leaves turn to dark green and are not so soft, also curl sideways down.
I added some pics that you can check and help me.
I thinks also that buds are not so big, but I'll let you decide.

I'm using 4 x LED bulbs 26W each (2,450lm), 12/12 light schedule with complete darkness.
I'm using BioBizz nutrients, my last 4 watering as follow (ml per liter):

WEEK 4 - 31/10/2016 -
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 3ml, TOP MAX - 1ml.
WEEK 4 - 04/11/2016 -
Same.
WEEK 5 - 08/11/2016 - (Made some increasing)
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 4ml, TOP MAX - 1ml.
WEEK 5 - 08/11/2016 - (Made more increasing)
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 5ml, TOP MAX - 4ml(as table of BioBizz).

Thanks you all and hope you can help me solve it with your experience!







Purple stems photo-

My full girl photo -

 

[Dankwolf]

A coulpe of the leafs look like there are white specks on them . do you have bugs ie mites rootaphids?

Plants seem to be showing multiple Deficiencies icluding phosphorus/potassium/ niteogen and others so they might be nute locked due to ph, underfed , rootaphids , mites , over watering

For me to gelp i would need more info . some one else might be able to help more but i would like to know more before i would even guess

What is your soil ph ?

What are the bug looking dots on the leafs?

How much water do you use each watering per plant ?

What size potters ?

Whats the soil/soiless mix?

How are yoyr temps and humidity ?

Do you use tap water if so is it chlorinated and if so do you leave it out for a few days to off gas the chlorine before mixing up nutes and watering?

I cant think of anything else off hand but if you can try to answer some of these questions it would make it eayser for any one to help .

 

[Vanilla Phoenix]

Also, what are you pHing your nute solution to?

 

[ofgoz222]

Thanks for reply guys, do I need to be worried?
Honestly I suspected [FONT=Arial, Helvetica, sans-serif]phosphorus/potassium d[/FONT][FONT=Arial, Helvetica, sans-serif][FONT=Arial, Helvetica, sans-serif]eficiencies[/FONT]...

[/FONT]I will answer as much as detailed as I can for your answers:

I'll check tomorrow morning for the dots, but maybe the dots you see is the brown dots I have? I'm growing indoor so I don't think this is the case but I'll check.

[FONT=Arial, Helvetica, sans-serif]I'm using tap water[/FONT][FONT=Arial, Helvetica, sans-serif] [/FONT][FONT=Arial, Helvetica, sans-serif]which rest about 24 hours and sometimes more before mixing nutrients.
I'm watering 4.5 liters of water each time, more or less per 3-4 days, waiting soil to become dry.
pot size is 13 liters.

I'm using regular and already mixed soil with some nutes inside that I bought from plant shop nearby.
For the ph, I do check every watering. Before mixing the nutes ph of water is around 7.5-8.0 but after mixing with nutes it becomes to around 6.3-6.7.
This is the range I'm watering, but still when cheeking the runoff I get ph around 5.7-5.85.

Temp and humidity I'm not checking, I have a fan that works all the time and temp is OK at that season, as now it's between winter, so temp is very comfortable and around 23-25 C in this season outside. I believe it's around 26-27 in the growing room so temp is OK as not too hot.

I need to water tomorrow morning, hope you can help till then
What do u suggest? maybe watering next time without any nutes? with plain'ed water with high rate of ph like 7 for example to bring ph soil up?
Thanks!
[/FONT]

 

[Loc Dog]

Mites and thrips are common indoors. You need a USB microscope to see them. Usually on bottom of leaves, and only a few per leaf can be devastating. I thought I had nutrient burn, and it was spider mites and thrips.

 

[Dankwolf]

I would try to test soil ph (especially if its peat based) if its below 6 it would explain some of the issues.you could use a fast acting lime to bring soil ph to acceptable level after about 1 1/2 to 2 weeks.



For now i would just go with the high ph water for now or go get some ro water to flush issue out hopefully. Intill ypy can rule out bugs or acidic soil .

You could try giving more phosphorus but i dont think it will help . i am leaning towerd peat based soiless mix has broke down and got acidic. Possably bugs root aphid or mites . but with out a ball park soil ph and with out varifcation of ph and or bug issues its still to mamy variable s that are not known so the cause can only be speculated .