Is this calcium deficiency?

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Fatasstrex

Fatasstrex

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I use cal-mag by general hydroponics. 1mL per liter. Grown in coco with perlite. pH of runoff is 5.8. pH of water with nutrients is 6.1/6.2. RH and Temps are good. Using Canna Coco A and B nutrients. The black spots seem to not be on the newest growth. It's still a pretty young plant.

IMG 2049
 
Jack og

Jack og

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Not calcium deficiencies, but zinc. Any macro nutrients in the line u using?
 
LittleDabbie

LittleDabbie

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Not calcium deficiencies, but zinc. Any macro nutrients in the line u using?


Problem: With a cannabis zinc deficiency, younger leaves start yellowing in between the veins. Leaf tips get discolored and start dying. the leaves may take on a unique banded appearance and the plant may stop growing vertically. There may be much less space between new nodes, which can cause new leaves to start bunching together. If the plant is budding, its flowers may stop growing or even start dying if the problem isn’t corrected.

thats not ZINC...


I see early early stage magnesium and calcium deficiency.
 
4plant

4plant

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Coco specific nutrients have extra calcium plus your adding cal-mag so it’s doubtful this is a lack of calcium.
Are you checking ec? You should know what your putting in vs coming out.
Calcium is takin up through transpiration so humidity and temperature are important as well.
 
LittleDabbie

LittleDabbie

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Coco specific nutrients have extra calcium plus your adding cal-mag so it’s doubtful this is a lack of calcium.
Are you checking ec? You should know what your putting in vs coming out.
Calcium is takin up through transpiration so humidity and temperature are important as well.


at a rate of . 1mL per liter. thats pretty LOW..

And theres reports (confirmed or not) That running LEDS is causing plants to uptake cal-mag in faster amounts then previous HID lights, which looking around the past week alone I've seen constant magnesium issues in people running LEDS.. a cpl cal issues but mostly magnesium.

3ml per gallon is a pretty basic rate, I use more then that in my soil grow.. So if hes coco it should be alot higher im thinking..


2 cents. Rub em together.
 
4plant

4plant

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That’s true, I’ve had to increase cal-mag while using leds. Does the canna coco give you an idea of how much extra calcium is in it?
I notice a lot of “deficiency issues” tend to be either early signs of over feeding young plants or a bad water schedule.
 
LittleDabbie

LittleDabbie

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Lemmie tag @Aqua Man hes way more knowledgeable on coco and there nutes and usages I'm gonna take a step back on this one, But i still feel its a calcium issue for sure, how to go about correcting that tho is outta my league with coco
 
Jack og

Jack og

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Here are some helpful charts on deficiencies... see what closely matches what u see , whole plant wise. This is primarily for soil but can identify issues in other media as well.
 
6349FD43 EB77 4EF9 9173 D09E55220541
7CAA77D2 DD2C 4C90 B474 68D440EDBDE5
48466981 B867 4238 93B7 91022F74B0E5
5FB191FB 2460 4306 A22D B86E18F946A1
2FEB6CD1 F26B 4A4A B986 78FEA9034C12
4766318A 124E 42D2 97CB 8AF7FC99F3F6
0CD8FD8F 2C20 45D1 B42F C8E12E24DEFC
784D18B2 60A7 4E77 B723 586C541D1A2C
0EB9297B FBD8 463A 843E BABCDDC1E681
0AA30243 1E1E 4061 90AF B87615253185
C1F8B301 2160 4B9E BDA6 7A5C184552BA
DB8CE070 3915 4D97 9B5A 2BC77C4DA7CD
15D35117 F003 4EE6 98BF 142F3F552AA5
Jack og

Jack og

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Aside from what others may have said, the lower leaf spotting and “rusty”, in my experience is a macro nutrients def, coco is a heavy cal feeder, that I can agree with, however ppl always forget that macro, trace minerals is also a factor that can be very easily overlooked in coco. So a coco specific macro feed would be key here.
 

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