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It might be a phosphorus deficiency. I am not entirely sure though.

These symptoms come up around week 4 after switching to 12/12 every time? When do you switch from Grow to Bloom nutes? Are you using the exact BioBizz recomendated dosages or less? Can you link the biobizz feeding plan? If you dont have an EC meter you might be able to research your water hardness online. Many cities have an index for water quality sorted by street name. Try to google "(your city name) water quality". If your water is super soft it might be calcium deficiency, if no it could be lack of phosphorus. Calcium deficiency is more of an hydro issue than on soil.

Also, how is you environment? Temperatures at day, at night? Humidity range?

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So first things first, a round of applause for the great information provided!  It made my day!!

You are both correct.  Both Calcium and Phosphorous can go hand in hand.

Here are outstanding links to these issues.

 

I think we got a bit of a humidity issue too and that may be part of the issue. 

To understand how that can be a factor you have to understand a bit of plant uptake, environment and what happens when a wrench like humidity affects this process.

I hope that helps and check out the other sections at those sites and you will likely find some of it helpful. ;)

Hempyfan

Ja Bless!

 

 

 

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Thank you all for the nice information ! GREAT !!!!

 

@ifish

How is your EC ?

Our EC is us/cm 121- So the EC ist 0,121 ?! Is that right ?

It is better to buy a EC Tool ?

 

Greetings

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An ec meter and ph meter from Bluelab are great tools to have , if your not organic growing  ( I would be lost without mine ) 

im not sure about the conversion of us/cm to ec 

but my water is very soft and it's about 0.1 , it's like using RO water I must add calmag every feed , I use it right from start as I am hydro and there is no calcium or anything else in my media to begin with : )

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Hope this helps a bit.  I took from 2 sites.

 

EC is better than PPM as depending on type of PPM meter used your PPM measurement could be different.  Due to this.  I do not recommend PPM meters.  It makes helping people more difficult at times.  

  • EC is a standard, PPM is not and can vary by brand.

 

What is conductivity?

Conductivity (measured in ppm, EC, TDS, CF) is the total soluble salts contained within a liquid solution.
Pure water does not contain salts, so it has a conductivity measurement of zero. By adding soluble elements to the water, electricity is able to move through the solution giving it a conductivity rating.

So why is it important?

Using hydroponics as an example, different crops grow well at different levels of nutrient strength (Electrical Conductivity - EC). Controlling this nutrient strength is all important in providing the best conditions for your crop. Without proper measurement your crop could fail from root burn brought on by too high a nutrient level, or death by natural causes from not receiving the vital elements they need to grow.

Different crops grow well at different levels of nutrient strength. It is important to control the nutrient strength to provide the conditions in the root zone which provide maximum uptake of balanced nutrition into the plant, while minimising stress.

For each crop there is a range in which the nutrient strength is optimal, providing enough nutrient for growth, but not so strong that the concentration of salts in the plant gets too high. Electronic meters are available to measure the conductivity of the nutrient solution.
  

Online conversion meter at bluelab:  Convert common conductivity measurements quickly and easily by using this conductivity converter.

 

Measurement conversion chart from EC

Bluelab products measure conductivity using EC (Electrical Conductivity) or CF (Conductivity Factor). We also provide measurements in ppm.
 

mS/cm2
(millisiemens per cm2)
EC
CF
ppm 500/ TDS
ppm 700
0.1
0.1
1
50
70
0.2
0.2
2
100
140
0.3
0.3
3
150
210
0.4
0.4
4
200
280
0.5
0.5
5
250
350
0.6
0.6
6
300
420
0.7
0.7
7
350
490
0.8
0.8
8
400
560
0.9
0.9
9
450
630
1.0
1.0
10
500
700
1.1
1.1
11
550
770
1.2
1.2
12
600
840
1.3
1.3
13
650
910
1.4
1.4
14
700
980
1.5
1.5
15
750
1050
1.6
1.6
16
800
1120
1.7
1.7
17
850
1190
1.8
1.8
18
900
1260
1.9
1.9
19
950
1330
2.0
2.0
20
1000
1400
2.1
2.1
21
1050
1470
2.2
2.2
22
1100
1540
2.3
2.3
23
1150
1610
2.4
2.4
24
1200
1680
2.5
2.5
25
1250
1750
2.6
2.6
26
1300
1820
2.7
2.7
27
1350
1890
2.8
2.8
28
1400
1960
2.9
2.9
29
1450
2030
3.0
3.0
30
1500
2100
3.1
3.1
31
1550
2170
3.2
3.2
32
1600
2240
3.3
3.3
33
1650
2310
3.4
3.4
34
1700
2380
3.5
3.5
35
1750
2450
3.6
3.6
36
1800
2520
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Generally, in plants I ranged from beginning at EC .8 at rooted clone to end of flowering 1.2 to 1.4   I would rarely go farther than that. 

A little nutrition goes a long way but depending on the environment, genetics and lighting what works for one is not necessarily copy and paste for another but it is close.

It is always better to go light and work up as you know the plant and gain experience.

FYI Cannabis can uptake far more nitrogen than it needs.  This is why people will range from higher numbers than others.  It is common I see issues with these plants than the person who owns them.  They think they have healthy plants because they will have a good green color and look good.  But it is not.

Doing this can lead to nitrogen toxicity which means it has stored too much nitrogen. 

  • It will make lousy yields,
  • lower quality, 
  • and is easier for pest and disease to take hold,
  • and it takes longer to finish.

Excesss nItrogen pushes growth and delays to effects negatively other plant development periods.

Hope that helps.  Oh, I like blue lab the best and I have tried about all of them.

 

Hempyfan.

Jah Bless!  Stay healthy people!!

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Thanks all for Help !!!

Now with CALMAG it is much better than without. On 2 plants i have the same problems as in post 1 but i will try to stop these :-)

Now I use Sannies Tabs and BioBizz Lightmix and hope everything will be fine.

 

 

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