Nutrient deficiency or lockout ?

Im 5 weeks into flower and have been struggling with yellowing and brown spots on my plants leaves. I use canna terra pro so i didnt have to start feeding my girls until the 2nd week of flower. I gave them 4 weeks of veg and im currently into my 5th week flower. Ive been feeding organic liquid fertiliser from guanokalong. Guanokalong grow / bloom / bat boost. Im giving recommended dosage but still having issues. I did top dress at the start of week 2 of flower with 30ml each of epsom salts ( magnesium ) gypsum ( calcium ) and bat guano ( P ) 1.10.1.
They started yelowing within a week after that and im wondering whether ive given my plants lockout or if they’re more hungry than im thinking. Can someone give me some advice please ? i will attach pics below, thank you.

Defo a deficiency in Magnesium

budman111 said:

Defo a deficiency in Magnesium

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thank you brother, i suspected it in the end and just gave them a nice feed and added 5tsp of epsom salts to warm water, mixed it up and added it to 5 gallon bucket mixed with some bat guano and guanokalong bloom, ph’d at 6.5.
Im hoping they bounce back, do you think they will grow much more now or do you think the mag deficiency would've hurt the crops too much ?
How long would it take to see a turn around ?

TBH I have never had this issue ever but knowing the weed it will bounce back within a week with a slight reduction in yield i would presume, someone else with this experience will hopefully advise more.

budman111 said:

TBH I have never had this issue ever but knowing the weed it will bounce back within a week with a slight reduction in yield i would presume, someone else with this experience will hopefully advise more.

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thanks my friend

It will work out. I neglected a plant more than the others not thinking about it in a phototron, the bottom of the container had roots coming out of the holes. Transplanted her and tore the roots at the bottom off. Sounded like ripping grass. I put her under the light, and left her alone. Water the soil lightly if needed. Leave it alone.she will bounce back for sure. No worries man

This was totally supposed to go to the other forum I was readjng....I'll just put this joint down.

Massachusetts86 said:

This was totally supposed to go to the other forum I was readjng....I'll just put this joint down.

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Lol no worries my friend.
Ive got 2 weeks left until harvest, do you think they will make it or do you think i should chop sooner ?
ive stopped any feeding now, even though i was using organic liquids.I just use water and ph at 6.5.
I can see banana’s coming out the top of a couple of buds too.

A couple guys using canna that i know of have to supplement up to 1 gram of magnesium sulfate per gallon. Your to far along to fix so ride it out and do better next round.

pinner420 said:

A couple guys using canna that i know of have to supplement up to 1 gram of magnesium sulfate per gallon. Your to far along to fix so ride it out and do better next round.

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thanks for advice my friend.
I did start giving them 1tsp per gallon of epsom salts for the last 2 waterings. I put 5tsp of epsom salts in 5 gallon bucket and ph’d at 6.5.
Ive heard alsorts of reviews regarding led lights using so much more magnesium aswell so maybe thats playing part to it.
if i pre load the canna terra pro with a bit more epsom salts, will that overdo it do you think ? Or would you just water in with it ?

Lnp32 said:

thanks for advice my friend.
I did start giving them 1tsp per gallon of epsom salts for the last 2 waterings. I put 5tsp of epsom salts in 5 gallon bucket and ph’d at 6.5.
Ive heard alsorts of reviews regarding led lights using so much more magnesium aswell so maybe thats playing part to it.
if i pre load the canna terra pro with a bit more epsom salts, will that overdo it do you think ? Or would you just water in with it ?

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Add to mix yes.

I think you top dressed with too much guano. Too much phosphorus will cause all kinds nutrient antagonism leading to some nutrients being locked out.