Let's play: Spot_the_Deficiency!

[bigbadbiddy]

Hello there ladies and gentlemen,

walk right up as we begin playing a round of everybody's favorite game, you guessed it right:
Spot_the_Deficiency!

The game is easy:
Pictures of deficient plants are posted and whoever identifies the correct deficiency gets lots of good karma and vibes sent their way.
Easy isn´t it?
And fun to boot!

Important to mention:
These plants were flowered in 5 gallon containers with organic soil mix.
The recipe being as follows (taken from my other thread):
[FONT=Arial, Helvetica, sans-serif][FONT=Arial, Helvetica, sans-serif]1 part = 5 liters

3 part peat moss
1 part coco coir
1 part hydroton with mycos
3 parts buckwheat hulls
2 parts EWC

Makes 50 liters of basic mix. A little more actually, I think about 55 or 60 liters. I just roughly measured it.

I amended with:
1 cup kelp
1 cup bloodmeal
2 cup bone meal
2 cup dolomite lime
1 cup oyster shell flour
1 cup neem seed meal
1/2 cup epsom salt
[/FONT][/FONT]
[FONT=Arial, Helvetica, sans-serif][FONT=Arial, Helvetica, sans-serif]I added by feel:
Azomite
Basalt meal
Lavarock meal
Glacial rock dust
Bentonite


The plants were watered with well-water of great quality and purity and the only additives used were Canna Bio Rhizotonic in veg and first 2 weeks of flower and Canna Bio Boost throughout flower (they received their last watering with Bio Boost last week and are receiving water only since yesterday).


[/FONT][/FONT]Without further ado, here is our first participant:
A Mr. Nice MasterKushxSkunk, indica leaning pheno. Very putrid odors, really disgusting stuff. Close to finish now and most leafs are turning dark purple/black.
But what you can still see in the pics is how it started:
With yellowing and orangeing and lots of "rust spots" appearing on the leafs.
OP's bet is a Magnesium or Manganese deficiency but let us see what the community says and how this would best be remedied.

 

[bigbadbiddy]

Our next two participants hail from Canada, PeakseedsBC Cinderella 99!

These plants look very healthy for the most part and might be a good control group to identify what if anything is wrong with the soil mix.

Here they are:

 

[bigbadbiddy]

Let us move right along to our next participant:
A Critical Mass from Mr. Nice that looked oh so good until later in flower when this manifested.

 

[bigbadbiddy]

And our last participant of the day:
Nl#5xSkunk from Mr. Nice.

Looking good towards the top but the lower nodes, bud sites and leafs are a bit funky!
The purple leaf tips are only at that one lower bud site. Nowhere else.
The other NLxSK pheno has its leaf turning dark purple/black now slowly but the color is decidedly different from those purple tips. More like the MKxSK posted further up and setting on much more slowly.

The pictured NLxSK is also still at lest a week, more like 2 away from the finish line.

 

[bigbadbiddy]

Just stumbled over the "fungus gnats or winged root aphids" sticky thread and damn that fits.

Would rather have a Cal-Mag deficiency but the odd flyer I see here or there since a week or so might just be winged root aphids and the non-winged siblings might have been gnawing at my roots all through flower ...

 

[bigbadbiddy]

So after doing "the potato test" I found that it is likely not root aphids but "just" fungus gnats. Currently battling with them using yellow strips and bird sand to cover the top layer of soil and keep it dry.


So if root aphids didn't cause the nute deficiencies/lockout, the question remains what did.

My best bet so far would be a mix of the following:
- Stress from the gnats
- Cold night-time temperatures (can fall below 15 °C for a period of 12 hours, that is nothing to sneeze at)
- My soil mix is not perfect and needs adjustment


If anybody can comment, come up with theories or could help me adjust the soil mix, that would be awesome.

For now I will do battle with the gnats and install a radiator to increase night-time temps.