Is this nute burn or something else?

[CriticalZ]

So so I guess I fucked up the feeding this time.. this is a 7 week old autoflower (mimosa cake). Ever since she was a little girl I had problems with the leaves being pale and a little yellow. But she grew just fine regardless. I don’t have any run off readings for you. But I follow an water scheduele that seems to work. I feed her twice with nutrients and then 1 time with just plain water, then repeat. Last watering was 3 days ago. I mixed all my nutrients together. And bam.. it showed 2.5 EC on the reader. I knew it was a little to high. But most of my previous plants have seemed to handle it just fine. Can anyone confirm the nute burn? Or do I have other problems that needs to be fixed!

 

[LoveGrowingIt]

It resembles potassium deficiency. Flowering plants need less N and more P & K. Do you know the pH?

I think I see some magnesium deficiency, too.

 

[CriticalZ]

It resembles potassium deficiency. Flowering plants need less N and more P & K. Do you know the pH?

I think I see some magnesium deficiency, too.

The magnesium was also a Tought of mine, so I have fed her some calmag. I don’t know the Ph at the roots. But the soil ph should be between 5.8 - 6.5. I also ph the water each feeding (6.5-7 ph)

 

[RoadKillSkunkHunt]

The magnesium was also a Tought of mine, so I have fed her some calmag. I don’t know the Ph at the roots. But the soil ph should be between 5.8 - 6.5. I also ph the water each feeding (6.5-7 ph)

For a soil grow, a pH of 5.8 is too low. Your goal should be 6.5 +/- .3

 

[LoveGrowingIt]

For a soil grow, a pH of 5.8 is too low. Your goal should be 6.5 +/- .3

Exactly! Nice chart.

The magnesium was also a Tought of mine, so I have fed her some calmag. I don’t know the Ph at the roots. But the soil ph should be between 5.8 - 6.5. I also ph the water each feeding (6.5-7 ph)

A soil slurry test for pH can be helpful and isn't hard to do. The soil pH is altered by more than the water pH. Decomposing organic matter, for example, can lower the pH until it is completely composted, which typically reaches a pH of about 7.0. So, I'd advise checking the pH before adjusting the nutrients. Your plant looks like it's at the stage when N is decreased and P & K is increased, though.

 

[Hossgrows]

Just my two cents. I'm an in ground, organic grower, new to growing cannabis.

 

[CriticalZ]

Exactly! Nice chart.


A soil slurry test for pH can be helpful and isn't hard to do. The soil pH is altered by more than the water pH. Decomposing organic matter, for example, can lower the pH until it is completely composted, which typically reaches a pH of about 7.0. So, I'd advise checking the pH before adjusting the nutrients. Your plant looks like it's at the stage when N is decreased and P & K is increased, though.

Yes, I have indeed decreased nitrogen and increased p & k, cause she is in early stage of flower

 

[brendog]

For a soil grow, a pH of 5.8 is too low. Your goal should be 6.5 +/- .3

View attachment 2467701

Wondering where you got that chart every piece of literature I've read says 5.8 to 6.5, i would think the botanists and biologists wouldn't be off by that much, according to that chart the pH should be 6.6 only with no variance

 

[mancorn]

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[ArtfulCodger]

I suspect you've been watering too often, based on the thickness and texture. That, coupled with your FFW feeding cycle, is probably why you're seeing a bit of edge and tip burn.

 

[LoveGrowingIt]

Wondering where you got that chart every piece of literature I've read says 5.8 to 6.5, i would think the botanists and biologists wouldn't be off by that much, according to that chart the pH should be 6.6 only with no variance

It depends on the type of nutrients and the growing method. For soil with organic nutrients, a pH close to 6.5 is optimal.

 

[RoadKillSkunkHunt]

Wondering where you got that chart every piece of literature I've read says 5.8 to 6.5, i would think the botanists and biologists wouldn't be off by that much, according to that chart the pH should be 6.6 only with no variance

Where did I get this chart? I have had it literally for years.

I think you need to go back and check your sources. No where have I ever seen it recommended to use a soil pH under 6.0. My chart highlights the sweet spot at 6.5. The range is actually 6.3 to 6.8. However I am curious where you got the information that 5.8 for soil is ok. That is more in line with coco/hydro. Here's the rest of that chart. The other half shows hydro parameters.

Please post your source. I'm curious on how they got the range you're stating. I want to see your "every piece of literature" because your range is off and will cause trouble with uptake. I'm not saying this to harm or be rude. I'm saying this to be helpful because soil being out of range is a common cause of uptake issues.

 

[brendog]

Where did I get this chart? I have had it literally for years.

I think you need to go back and check your sources. No where have I ever seen it recommended to use a soil pH under 6.0. My chart highlights the sweet spot at 6.5. The range is actually 6.3 to 6.8. However I am curious where you got the information that 5.8 for soil is ok. That is more in line with coco/hydro. Here's the rest of that chart. The other half shows hydro parameters.

View attachment 2468316

Please post your source. I'm curious on how they got the range you're stating. I want to see your "every piece of literature" because your range is off and will cause trouble with uptake. I'm not saying this to harm or be rude. I'm saying this to be helpful because soil being out of range is a common cause of uptake issues.

Definitely older sources the 3 grow bibles I read and Ed Rosenthal, i use 5.8 for clones and inert but what I read was the plant uptakes nutrients 5.8-6.5 things have been changing in the industry really quickly i wouldn't doubt that some of my info is outdated but its not like the bioavailability of nutrients changes over time

 

[brendog]

Where did I get this chart? I have had it literally for years.

I think you need to go back and check your sources. No where have I ever seen it recommended to use a soil pH under 6.0. My chart highlights the sweet spot at 6.5. The range is actually 6.3 to 6.8. However I am curious where you got the information that 5.8 for soil is ok. That is more in line with coco/hydro. Here's the rest of that chart. The other half shows hydro parameters.

View attachment 2468316

Please post your source. I'm curious on how they got the range you're stating. I want to see your "every piece of literature" because your range is off and will cause trouble with uptake. I'm not saying this to harm or be rude. I'm saying this to be helpful because soil being out of range is a common cause of uptake issues.

I also have worked with and learned from incredibly capable and reputable growers with collective centuries of experience. Definitely looks like someone made that chart on PowerPoint or something tho not doggin you either, a quick Google search and it looks like 5.8-6.5 is averaged between inert and soil so the noobs can k.i.s.s. I always run soil at 6.1 to save pH down and have had the best results that way

 

[brendog]

Where did I get this chart? I have had it literally for years.

I think you need to go back and check your sources. No where have I ever seen it recommended to use a soil pH under 6.0. My chart highlights the sweet spot at 6.5. The range is actually 6.3 to 6.8. However I am curious where you got the information that 5.8 for soil is ok. That is more in line with coco/hydro. Here's the rest of that chart. The other half shows hydro parameters.

View attachment 2468316

Please post your source. I'm curious on how they got the range you're stating. I want to see your "every piece of literature" because your range is off and will cause trouble with uptake. I'm not saying this to harm or be rude. I'm saying this to be helpful because soil being out of range is a common cause of uptake issues.

I would name drop but normally you would have to sign an nda with these fellas and we didnt since we have mutual respect

 

[brendog]

It depends on the type of nutrients and the growing method. For soil with organic nutrients, a pH close to 6.5 is optimal.

So I use royal gold kings mix/basement mix or their floor scrapings its basically coco/perlite with aged forest materials and a light guano amendment so depending on what you define as soil the pH varies more to the lower side, I get that with black midwest dirt you would want to be on the high side but if you're buying bagged soil I wouldn't suggest being above even 6.3

 

[brendog]

Where did I get this chart? I have had it literally for years.

I think you need to go back and check your sources. No where have I ever seen it recommended to use a soil pH under 6.0. My chart highlights the sweet spot at 6.5. The range is actually 6.3 to 6.8. However I am curious where you got the information that 5.8 for soil is ok. That is more in line with coco/hydro. Here's the rest of that chart. The other half shows hydro parameters.

View attachment 2468316

Please post your source. I'm curious on how they got the range you're stating. I want to see your "every piece of literature" because your range is off and will cause trouble with uptake. I'm not saying this to harm or be rude. I'm saying this to be helpful because soil being out of range is a common cause of uptake issues.

Sorry im probably privileged and im counting roots organic/aurora or royal gold bagged soil as actual soil. What im using is mainly coco/perlite with aged forest materials and light amendments, then I amend on top of that with organics so not really a traditional soil like you would dig up out of your backyard more inert, I wouldn't use anything else tho its "soil" but designed specifically for cannabis

 

[RoadKillSkunkHunt]

Sorry im probably privileged and im counting roots organic/aurora or royal gold bagged soil as actual soil. What im using is mainly coco/perlite with aged forest materials and light amendments, then I amend on top of that with organics so not really a traditional soil like you would dig up out of your backyard more inert, I wouldn't use anything else tho its "soil" but designed specifically for cannabis

If its mainly perlite and coco, it doesn't fit the definition of a potting soil mix. It fits the definition of coco. If you're in coco, then running at 5.8 for your pH is fine. However, at the end of the day, call it what you want. We are comparing an inert substrate that has been altered to a nutrient rich potting mix. They are not the same. It's certainly not traditional soil. You said that yourself. What you are using changes what you said dramatically. My answer remains the same. Ideal pH in soil is between 6.3 and 6.8 with the sweet spot being 6.5.

You're in amended coco. This isn't to say what it is is useless. It can be good. We're simply not talking about the same thing.

 

[OldSchoolest]

If you get out your microscope on this one, and look under 1000x, you’ll see tiny little signs that say “you’re worrying too much” ha ha. Right now you’re riding the line between just enough and too much, and honestly that’s where you want to be in flower in my experience! But don’t think so hard, and if it’s a serious issue….the plants will absolutely let you know. You won’t have to guess or look extra close.