A bit of a problem i think......

Hi everyone, this is my first indoor grow and im growing organically in coco with perlite. She is are under 400 mh light. Leaves seem a bit light in color on the insde of leaf.......
Any help is much appreciated!!

Looking pretty good! Did you buffer your coco prior to planting in it? What kind of water do you use? Have you fed already?

Im using canna coco and it says its buffered. Using RO water mix with a little bit of dechlorinated tap water to raise ph to 6.5-6.8 and organic slow release fertilizer premixed in the soil. 4 weeks old

Genki88 said:

Im using canna coco and it says its buffered. Using RO water mix with a little bit of dechlorinated tap water to raise ph to 6.5-6.8 and organic slow release fertilizer premixed in the soil. 4 weeks old

Click to expand...

Bro you need cal mag..and maybe more nitrogen! COCO loves cal mag..remember, coco doesnt hold any nutes..you must refill it every day..just water plain phed water when your run off is 0.5 higher than what you put in and try to stabilize the ec where you want ..And in my opinion you should use some synthetic fertilizers..Generally coco needs more food than soil..what you use may be insufficient for the coco..
Also you may not need to use perlite with coco and airpots..cause where the perlite is, there is plenty of oxygen due to coco and airpots, and where is oxygen there are no nuts.As a result the root destribution will be different.so IN MY OPINION would be better if you run coco with airpots ,without perlite!

I wish i help you man..
Good luck!


E.C.

Genki88 said:

Im using canna coco and it says its buffered. Using RO water mix with a little bit of dechlorinated tap water to raise ph to 6.5-6.8 and organic slow release fertilizer premixed in the soil. 4 weeks old

Click to expand...

Before adding too much of anything, make sure you bring that ph down to around 5.8! Also with RO, and coco, you will need cal-mag with every watering! Are you using coco or soil? Slow release fertilizer doesn't help the equation

So I know of a guy on Youtube Mr.Cannucks Grow or something like that. He uses coco, slow released ferts and handles his grow like a soilless grow. He has some pretty damn good results. He however, does not adhere to any of the rules I do, when using coco and synthetics. He pH's as though he's in soil and he waters as though he's in soil. I suppose his success is based on the slow release fert., I don't know, but he does fairly well. I'm old and slow; I try to keep things simple (straight coco), but I suppose a cat can be skinned a thousand ways.

For sure your girls are short on Mg and maybe N...BUT...maybe it's taking some time for your fertilizer to breakdown and feed the plants. Tread lightly here so you don't over do something, while waiting for your nutrients to kick in. A little foliar feed of Epson will green them up and help with the Mg in the mean time.

Good luck.

I'm going to have to politely disagree and say you have too much K somewhere. Looks like a mag def, but it's too much K... In my opinion.

Also, I don't find calmag to be needed every time. Maybe every 3rd. Also, ph is fine between 5.7-6.5 going in.

Just my opinion.

3rd Monkey said:

I'm going to have to politely disagree and say you have too much P somewhere. Looks like a mag def, but it's too much P... In my opinion.

Also, I don't find calmag to be needed every time. Maybe every 3rd. Also, ph is fine between 5.7-6.5 going in.

Just my opinion.

Click to expand...

How do you come up with a guess like too much P? No mention of feed at all has been given! How does excess P differ from say excess K? Or maybe excess cal or iron is locking out Mg? Why do you say it's P when there is absolutely no info mentioned on what the feed is?

Blitz35 said:

How do you come up with a guess like too much P? No mention of feed at all has been given! How does excess P differ from say excess K? Or maybe excess cal or iron is locking out Mg? Why do you say it's P when there is absolutely no info mentioned on what the feed is?

Click to expand...

Slow release fertilizer, from OP.

I say it's P because I've had to adjust compost piles for that specific reason. Too much P causes that mottling at the top and the shade of the leaves... It just says P to me. Experience I guess.

I also run a coco/soil mix. So I guess that's just what I've noticed in my grows.

Also, coco holds P pretty well.

3rd Monkey said:

Slow release fertilizer, from OP.

I say it's P because I've had to adjust compost piles for that specific reason. Too much P causes that mottling at the top and the shade of the leaves... It just says P to me. Experience I guess.

Click to expand...

The only reason it's mottled at the top is because either there is an issue with a heavier metal...but that heavier metal would be affected by an excess of any cation, not just P, or possibly some heat stress being the leaves are a bit curled over one section, maybe that part is right under the light or closest to it. So to look at a plant and say, it's too much P, without knowing anything about what has been put in, to me is not from experience Not to mention, Op is not growing in compost, he's growing in coco/perlite. A bit of slow release fertilizer mixed in with coco is not going to overfeed, especially P, which is usually present in lowest amounts (npk). I would say for now, the biggest issue to fix first, is the ph! 6.5-6.8 is too high for coco, once that's done, then feed can be adjusted.

Blitz35 said:

The only reason it's mottled at the top is because either there is an issue with a heavier metal...but that heavier metal would be affected by an excess of any cation, not just P, or possibly some heat stress being the leaves are a bit curled over one section, maybe that part is right under the light or closest to it. So to look at a plant and say, it's too much P, without knowing anything about what has been put in, to me is not from experience Not to mention, Op is not growing in compost, he's growing in coco/perlite. A bit of slow release fertilizer mixed in with coco is not going to overfeed, especially P, which is usually present in lowest amounts (npk). I would say for now, the biggest issue to fix first, is the ph! 6.5-6.8 is too high for coco, once that's done, then feed can be adjusted.

Click to expand...

Well I'm still going to disagree based on what I read in the plant. Coco holds P very well. So everything else drains off and the P is still there. I also water at 6.5 (straight out of the tap) in straight, uncut coco. Lot of myths around it. I simply make sure to stagger my ph once in a while to account for low end nutrition. Which everyone who grows in a non soil medium should do.

You can't tell me what I see, nor can I say what you see.

I'll leave the science to you because I feel it's mostly bullshit now and just screws things up. This is just my opinion on it based on my grows. I do better without science, just reading the plant.

3rd Monkey said:

Coco holds P very well. So everything else drains off and the P is still there.

Click to expand...

If it works for you, great, but you have the science completely off, thus leading you to make false judgements First off, P is not held strongly by coco, assuming that the P is even in a cation state, which depending on which other element it's bonded with, it can be a cation, or anion, in which case it will not be held at all. Calcium and magnesium have the strongest bond to cec sites in coco, then potassium and sodium. Phosphorus is not held strongly at all by coco! Anyways, with comments like science is bs, and you base it off what you see, without knowing key inputs, it would be hard to fully explain the logic behind it ): Best of luck in your grows!

Blitz35 said:

If it works for you, great, but you have the science completely off, thus leading you to make false judgements First off, P is not held strongly by coco, assuming that the P is even in a cation state, which depending on which other element it's bonded with, it can be a cation, or anion, in which case it will not be held at all. Calcium and magnesium have the strongest bond to cec sites in coco, then potassium and sodium. Phosphorus is not held strongly at all by coco! Anyways, with comments like science is bs, and you base it off what you see, without knowing key inputs, it would be hard to fully explain the logic behind it ): Best of luck in your grows!

Click to expand...

Coco definitely holds P. Do you grow in coco lol.

https://growguru.co.za/blogs/hydroponic/buffering-coco-coir

Here, you like science.

Didn't even need science to tell me that. You can see it when you grow in it.

@Blitz35

I keep saying phosphorus and mean potassium, so you're right, but just replace phosphorus with potassium and that's what I mean lol.

3rd Monkey said:

https://growguru.co.za/blogs/hydroponic/buffering-coco-coir

Here, you like science.

Didn't even need science to tell me that. You can see it when you grow in it.

Click to expand...

im done dude, you clearly have no idea what im trying to explain Thanks for the link, you proved my point! Do a quick search, and you will see your link does not even contain the word phosphorus! lol. All you did with this link, was prove how wrong you were when you said "Coco holds P very well. So everything else drains off and the P is still there." Again, happy growing, it just sucks when false info is passed along to newbies from people who can't grasp the science of it Good luck, happy growing!

3rd Monkey said:

@Blitz35

I keep saying phosphorus and mean potassium, so you're right, but just replace phosphorus with potassium and that's what I mean lol.

Click to expand...

Now you say it lol. Either way, the bond between calcium or magnesium, and coco, is stronger than the bond with potassium..it's why buffering with cal-mag, will displace the potassium from cec sites and replace with cal or mag. Coco comes with a lot of sodium and potassium in it due to the areas they tend to grow in (near salt water), but the actual attraction of sodium or potassium, is not the strongest. Hope someone learns something from this rambling lol

Blitz35 said:

im done dude, you clearly have no idea what im trying to explain Thanks for the link, you proved my point! Do a quick search, and you will see your link does not even contain the word phosphorus! lol. All you did with this link, was prove how wrong you were when you said "Coco holds P very well. So everything else drains off and the P is still there." Again, happy growing, it just sucks when false info is passed along to newbies from people who can't grasp the science of it Good luck, happy growing!

Click to expand...

You're absolutely right. I even typed in potassium when I searched it. Not sure why I keep saying phosphorus lol.

Anyhow, if you swap them out, that's what I mean and the rest stays the same.

Blitz35 said:

Now you say it lol. Either way, the bond between calcium or magnesium, and coco, is stronger than the bond with potassium..it's why buffering with cal-mag, will displace the potassium from cec sites and replace with cal or mag. Coco comes with a lot of sodium and potassium in it due to the areas they tend to grow in (near salt water), but the actual attraction of sodium or potassium, is not the strongest. Hope someone learns something from this rambling lol

Click to expand...

I still see what I see, glad you called me out on the PK thing because I've been fucking it up all morning and nobody has said anything lol, now I have to go fix shit.