Help please!

[rbrtwrght]

Hi,

I have two plants (first grow), and one appears to either have nute burn or a calcium deficiency. I'm a noob though, so I'm probably way off.

Also, yesterday I noticed that only couple of leaves had the rusting issue. Since watering yesterday, I checked back today and it's really starting to spread.

I realise now that this was a mistake, but they are planted in Westland Gro-Sure compost which has 4 months of feed already added. However, they're both in the same soil, and the other one is doing just fine.

Any ideas?

Thank you!

 

[danielbae]

This is not a nute burn, you would have burned tips. Do you check your PH? I'd go for some calmag.

 

[curious2garden]

Hi,

I have two plants (first grow), and one appears to either have nute burn or a calcium deficiency. I'm a noob though, so I'm probably way off.

Also, yesterday I noticed that only couple of leaves had the rusting issue. Since watering yesterday, I checked back today and it's really starting to spread.

I realise now that this was a mistake, but they are planted in Westland Gro-Sure compost which has 4 months of feed already added. However, they're both in the same soil, and the other one is doing just fine.

Any ideas?

Thank you!

It looks like a Ca deficiency. I'm in hydro so I use General Hydroponics CaliMagic I don't know what you use in soil but someone will be around. Your plants look good overall, nice job.

 

[rbrtwrght]

Thanks guys, really appreciated!!

PH is around 7, so okay I think?

I've not been feeding them as the soil had it already included. So, should I just get some cal/mag, or get some general nutes which include cal/mag?

Thanks again!

 

[danielbae]

A little high, Id aim for 6.5 to 6.8 PH for earth. I'd get some cal/mag separately. Its always useful to have that around. I also dont know Westland Gro-Sure, is that 4 months for cannabis or something else?

 

[rbrtwrght]

A little high, Id aim for 6.5 to 6.8 PH for earth. I'd get some cal/mag separately. Its always useful to have that around. I also dont know Westland Gro-Sure, is that 4 months for cannabis or something else?

Thanks for your help.

It's just a general compost from my local garden store (in the UK). I'll get some cal/mag tomorrow. I'm not sure whether or not I should be feeding as well.

 

[danielbae]

me neither! A light organic feed wouldnt hurt imo. Or make a compost tea.

 

[rbrtwrght]

me neither! A light organic feed wouldnt hurt imo. Or make a compost tea.

I'll try that, thanks!

 

[nmibud]

This is the stage of bloom where more potassium is needed.A little hardwood ash will help.

 

[Jypsy Dog]

Why a pH of 7 is too high.

 

[Roger A. Shrubber]

don't forget that the ph scale is logarithmic, each number is 10 times the previous number, so being off one number matters....
in hydroponics, and to a smaller degree in soil, the ph will slowly rise as the plants consume nutrients. i use hempy buckets, and make my solution up at 5.7. at the end of the day if i take a small sample to check, it's gone up to 5.9 or 6, which is fine, and expected. the same thing happens in soil, but slower. if i was in soil, i'd make my solution up at 6.3 or 6.4 and let it self adjust as it uses up nutrients.

 

[Kassiopeija]

don't forget that the ph scale is logarithmic, each number is 10 times the previous number, so being off one number matters....
in hydroponics, and to a smaller degree in soil, the ph will slowly rise as the plants consume nutrients. i use hempy buckets, and make my solution up at 5.7. at the end of the day if i take a small sample to check, it's gone up to 5.9 or 6, which is fine, and expected. the same thing happens in soil, but slower. if i was in soil, i'd make my solution up at 6.3 or 6.4 and let it self adjust as it uses up nutrients.

I've been told by the manufacturer of my organic fertilizer (BioBizz Holland) that I should feed tapwater with a pH around ~7.2, because the bacteria in their soil will actually decrease its pH down to normal levels (6.5) due to their metabolising the feeded sugars.
But I'm seeing alot of problems with ppl using their stuff (at another forum) so I sometimes wonder if things even work out as planned. Organic grows there's just less ability to do a control/ recheck if things go astray so I'm all to keen on getting on info on how living soil behaves...

Why a pH of 7 is too high.View attachment 4429265

Hello, do you notice/ can you explain the harsh changed behaviour of Ca in Hydro vs soil?

 

[Roger A. Shrubber]

I've been told by the manufacturer of my organic fertilizer (BioBizz Holland) that I should feed tapwater with a pH around ~7.2, because the bacteria in their soil will actually decrease its pH down to normal levels (6.5) due to their metabolising the feeded sugars.
But I'm seeing alot of problems with ppl using their stuff (at another forum) so I sometimes wonder if things even work out as planned. Organic grows there's just less ability to do a control/ recheck if things go astray so I'm all to keen on getting on info on how living soil behaves...


Hello, do you notice/ can you explain the harsh changed behaviour of Ca in Hydro vs soil?

they could be right. i'm a drain to waste coco hempy bucket guy, and know how it works in my little "reservoirs" in each bucket, but i keep those sterile and the only thing effecting ph is the plants use of the available nutrients. a micro-herd of benes could easily change things. soil is usually pretty forgiving of ph, as long as you're in the general vicinity of 6.5 it will self correct, but long term use of water well outside of the safe range could cause some serious problems eventually.

 

[Kassiopeija]

they could be right. i'm a drain to waste coco hempy bucket guy, and know how it works in my little "reservoirs" in each bucket, but i keep those sterile and the only thing effecting ph is the plants use of the available nutrients. a micro-herd of benes could easily change things. soil is usually pretty forgiving of ph, as long as you're in the general vicinity of 6.5 it will self correct, but long term use of water well outside of the safe range could cause some serious problems eventually.

I'm also remembering that plant roots will give away protium (H+) in order to assimilate nutrients so that may be -or not- one reason why some substrate may go more alkaline over time? Do you reuse your coco again? I think I remember something about Coco becoming more acidic over time IF it starts to breakdown... not sure on that... and I'm not having that much exp with Coco just using that for an amendment to get my soil less sharp (for cuttlings etc) but I'm currently reconsidering the usage of coco....

 

[Jypsy Dog]

I'm also remembering that plant roots will give away protium (H+) in order to assimilate nutrients so that may be -or not- one reason why some substrate may go more alkaline over time? Do you reuse your coco again? I think I remember something about Coco becoming more acidic over time IF it starts to breakdown... not sure on that... and I'm not having that much exp with Coco just using that for an amendment to get my soil less sharp (for cuttlings etc) but I'm currently reconsidering the usage of coco....

Have you been on this site yet?

Cannabis Grow Guide - Coco For Cannabis - Science and Practice

Cannabis grow guide: articles, tutorials, DIY projects & more! Dedicated to the science and practice of growing cannabis in coco perlite and other media.

www.cocoforcannabis.com

 

[Roger A. Shrubber]

I'm also remembering that plant roots will give away protium (H+) in order to assimilate nutrients so that may be -or not- one reason why some substrate may go more alkaline over time? Do you reuse your coco again? I think I remember something about Coco becoming more acidic over time IF it starts to breakdown... not sure on that... and I'm not having that much exp with Coco just using that for an amendment to get my soil less sharp (for cuttlings etc) but I'm currently reconsidering the usage of coco....

i reuse it once.
i have 2 big tubs. one is pure coco, one has been used once. i dump rootballs in the second tub, let them dry out, shake them loose, then pick most of the big clumps of root out of the bin, and i'll reuse that once, then it gets dumped into the garden or a raised bed.
i tried using it a third time, but started running into problems with ph and bad smelling root mass, like it was wanting to get septic from the coco and roots breaking down.
so reuse once, then get rid of it is my advice.

 

[Jypsy Dog]

i reuse it once.
i have 2 big tubs. one is pure coco, one has been used once. i dump rootballs in the second tub, let them dry out, shake them loose, then pick most of the big clumps of root out of the bin, and i'll reuse that once, then it gets dumped into the garden or a raised bed.
i tried using it a third time, but started running into problems with ph and bad smelling root mass, like it was wanting to get septic from the coco and roots breaking down.
so reuse once, then get rid of it is my advice.

Twice is nice...the thirds a terd.

 

[ColoradoHighGrower]

I'm also remembering that plant roots will give away protium (H+) in order to assimilate nutrients so that may be -or not- one reason why some substrate may go more alkaline over time? Do you reuse your coco again? I think I remember something about Coco becoming more acidic over time IF it starts to breakdown... not sure on that... and I'm not having that much exp with Coco just using that for an amendment to get my soil less sharp (for cuttlings etc) but I'm currently reconsidering the usage of coco....

More H+ means more acidic, not more basic (that'd be the partner OH-)