Can you tell what deficiency this is?

[TrimmingSucks]

Picture says it all. 2 weeks into flower. Currently using advanced nutrients. Sensi bloom A&B. Ebb n flow. Also any hydroponics/coco nutrient recommendations would be appreciated. Much obliged fellow farmers.

 

[TrimmingSucks]

Also what is this?

 

[TrimmingSucks]

For your viewing pleasure. 7ft tall ebb n flow

 

[TrimmingSucks]

Bump. I am using half strength maybe need to up the ppm to full strength? They are some big plants

 

[TrimmingSucks]

They’re ph perfect Nutes and pH sits at 5.4-5.5

 

[Entropy]

Looks a bit like light stress possibly, they look close to the lights in that 1 picture, could just be perspective. Is the upper growth most affected? Not always the closest leaves first, sometimes takes a few days for light stress to show, especially with "cooler running" leds. So it may look like it's starting in the upper middle of the plant first.

 

[BurnzYzBudZz]

First picture looks like magnesium def. second picture I’d scope for mites and/or other pests. Third pic looks like a huge healthy tree. Wait until some others chime in as well in the morning.

 

[TripsRabbit]

Calcium and magnesium deficiencies, bigger plants like the ca and mg and will cannabalize fans if they don't get enough. I like to mix garden gypsum into my coco before potting and add epsom salts to the top of media as needed to help combat this.

 

[BillFarthing]

It looks like they are hungry for magnesium from the LED's.

Bump up your feed strength before adding something more like cal-mag or epsom salt.

 

[MIMedGrower]

I agree with @Entropy looks like light stress first pic. Next guess is potassium deficiency. And with a plant that big its likely.

Second pic looks like calcium spots.


Mag deficiency starts at the oldest leaves. Calcium newer leaves.

 

[TrimmingSucks]

Looks a bit like light stress possibly, they look close to the lights in that 1 picture, could just be perspective. Is the upper growth most affected? Not always the closest leaves first, sometimes takes a few days for light stress to show, especially with "cooler running" leds. So it may look like it's starting in the upper middle of the plant first.

That picture is definitely bad perspective the light is at least 3 ft above the plant showing symptoms. The bigger plant (in the last picture) is way closer no issues though.

 

[TrimmingSucks]

Calcium and magnesium deficiencies, bigger plants like the ca and mg and will cannabalize fans if they don't get enough. I like to mix garden gypsum into my coco before potting and add epsom salts to the top of media as needed to help combat this.

Thank you for your response. Should I add Epsom salts to my reservoir or increase my nutrient solution? It does contain magnesium and calcium but maybe not enough?

 

[TrimmingSucks]

It looks like they are hungry for magnesium from the LED's.

Bump up your feed strength before adding something more like cal-mag or epsom salt.

Will do thank you for your help!

 

[TrimmingSucks]

I agree with @Entropy looks like light stress first pic. Next guess is potassium deficiency. And with a plant that big its likely.

Second pic looks like calcium spots.


Mag deficiency starts at the oldest leaves. Calcium newer leaves.

Thanks for your response. What do you think of adding Epsom salt to clear this deficiency?

 

[MIMedGrower]

Thanks for your response. What do you think of adding Epsom salt to clear this deficiency?

I dont think it is magnesium or sulfer that is the problem. Thats what epsom salts are.


Like @BillFarthing said I would up the base fertilizer first to see if that clears things up.

 

[Aqua Man]

Ph perfect nutrients. Designed for RO if you are having nutrient issues then here is what I would look at.

Throw your ph meter away (not literally)

When was the last res change done?

Feed at full strength or at least 600-800pp. For thise plants as they dont work well in low concentrations.

Are you having root issues? Found smell signs of root decay etc. Judging from the plants i don't think so.

Do not add other nutrients to PH perfect without knowing the interactions as these aren't like most nutrients.

Never attempt to Ph adjust PH perfect. Just change the res when things go out of whack and make sure to use 600+ppm so they can balance ph properly.

 

[TripsRabbit]

Thanks for your response. What do you think of adding Epsom salt to clear this deficiency?

Epsom salt will not cure anything. You use epsom salt and gypsum for preventative maintenance. Your deficiencies are present weeks b4 you see them on the leaves.

 

[Aqua Man]

Plus sometimes a plant just starts to shed the oldest leaves as the become less productive. Usually after a couple months of growth.

 

[TrimmingSucks]

I dont think it is magnesium or sulfer that is the problem. Thats what epsom salts are.


Like @BillFarthing said I would up the base fertilizer first to see if that clears things up.

Ok thank you. What ppm do you recommend for 5-7 ft plants? I really appreciate your help.

 

[TrimmingSucks]

Ph perfect nutrients. Designed for RO if you are having nutrient issues then here is what I would look at.

Throw your ph meter away (not literally)

When was the last res change done?

Feed at full strength or at least 600-800pp. For thise plants as they dont work well in low concentrations.

Are you having root issues? Found smell signs of root decay etc. Judging from the plants i don't think so.

Do not add other nutrients to PH perfect without knowing the interactions as these aren't like most nutrients.

Never attempt to Ph adjust PH perfect. Just change the res when things go out of whack and make sure to use 600+ppm so they can balance ph properly.

Hello and thanks for your help. Last res change was one week ago. Roots smell and look good. I only recently started increasing the ppm 1-2 weeks ago. From 300-400 ppm to 800-1200 ppm. So Maybe I’m seeing deficiencies that started weeks ago only now and this is probably due to the inadequate amount of nutrients I was initially using? I’ll be going over there later today to check on them.