Help with plant needed

[KonopCh]

Hello, @Waira!!

Could you please help me?
I grow first time in 1L coco with Autopot tray. Plant is 51 days old and started budding. It's autoflower, I guess she will go around 80-90 days because of late flowering. It's summer here and temp in tent is 29-35°C, some days lower if we have rain. I use COBs. RH is 45-60%.

I am using tap water which sits 24 hours or more. EC is 0,5. I also use AN Sensi bloom, PK 13/14, Bud candy and Big bud. For now at that age. I am also adding Ca/Mg (both nitrates) before anything else in my water. I don't check pH because AN says so. But I have some pH strips (scale 4-7) so I can pretty accurate read that pH is 5,5-6,0. I know strips are not pH meter, but as I said, nutes do not need pH check.

My guess is N and Mg deficiency, with some PK. But my nutes are already at 2,5 EC, which is high in my opinion. I never gone that high, everytime around 2 EC in soil.

Here are two pictures of large and small leaves. See light green veins on larger leaf and some purple color on smaller one?

Here are pictures from whole plant:

 

[namvet25]

You may need to up your nitrogen feed and also up your cal/mag and keep ph around 5.8.Yellow leaves will not come back so it's better to remove them.

 

[DreadHeadiez]

You may need to up your nitrogen feed and also up your cal/mag and keep ph around 5.8.Yellow leaves will not come back so it's better to remove them.

I wouldn't remove any leaves until the issue has been addressed and fixed. When there is a deficiency or problem present removing leaves will only target other leaves instead of utilizing and cannibalizing the already problematic leaves.

 

[KonopCh]

You may need to up your nitrogen feed and also up your cal/mag and keep ph around 5.8.Yellow leaves will not come back so it's better to remove them.

I give them 2ml/L Cal/Mag, which is 3% Ca and 1.2% Mg. On top of my hard water which I guess has some Ca/Mg already in it. Also AN nutes have some Ca/Mg in them.
And my EC is already 2.5 EC which is high in my opinion. You sure to up nutes even more?

 

[KonopCh]

I wouldn't remove any leaves until the issue has been addressed and fixed. When there is a deficiency or problem present removing leaves will only target other leaves instead of utilizing and cannibalizing the already problematic leaves.

Agree with that.

 

[namvet25]

I'm not a coco expert so hopefully someone with more experience will be along to help.As far as the yellow leaves are concerned you can leave them alone if you like to look at them but they are basically dead and serve no real purpose.

 

[DreadHeadiez]

I'm not a coco expert so hopefully someone with more experience will be along to help.As far as the yellow leaves are concerned you can leave them alone if you like to look at them but they are basically dead and serve no real purpose.

When it's dead it will drop or fall off. Period. Removing the leaf before the issue is correct will just affect other regions of growth on the plant. Especially considering we don't know the exact problem yet. You can argue and say the plant wastes energy and I can argue and say that it causes stress. At the end of the day it ain't dead until it goes on its own... We try and mess to much with our plants. It may not look ornamental or magazine cover worthy but it's beneficial to keep them .

 

[namvet25]

When it's dead it will drop or fall off. Period. Removing the leaf before the issue is correct will just affect other regions of growth on the plant. Especially considering we don't know the exact problem yet. You can argue and say the plant wastes energy and I can argue and say that it causes stress. At the end of the day it ain't dead until it goes on its own... We try and mess to much with our plants. It may not look ornamental or magazine cover worthy but it's beneficial to keep them .[/QUOTE There are a lot of different opinions about removing yellowing leaves and after removing them from my plants over the past six years I have found no i'll effects from doing this but this is just my own opinion and everyone is welcome to do what ever they feel is right for them.

 

[KonopCh]

Any updates?

 

[Waira]

*(from PM).... I need whole plant pics too, this tells me where symptoms are showing, a vital clue,... lowers going overall yellow is usually N defc.,.. that color burnishing and necrotic patches are likely P defc.,.... with inputs like that, it makes me wonder about the actual in-pot pH,...
AN nutes, in RP or low ppm water can self buffer, in harder water it struggles, and once in-pot, that so called self buffering is no longer able to do the job,.. in a res' is one thing, but in a pot, with all the other pH influencing factors in play, it's not! ...Tap water is 0.5 EC,... 1.0 EC = 500ppm (American... Aussie and EU have different ppm value equivalents- )... in any case, that about 250ppm which is hard water, it's working the AN's buffering capacity in solution hard, trust me!
..In soil/soilless, you need a proper pH probe to test in-pot, run-off is impossible in Autopots of course,..and it's a lousy method in general,.. get an Accurate 8 soil pH probe, there's no substitute for this when shit's going south and pH needs to be checked to figure out what to do next,.. if you have off pH, adding more nutes will make matters worse,... what amounts are you putting in? Res' pH is 5.5-6.0? --that's OK for coco,... As for the final EC, that's pretty rich, even subtracting the tap water's EC,... Ca-Mg might be overkill with water that hard,.. too much free Ca/Mg can interfere with with other nute elements uptake,... and the AN crap is loaded with N as is, no take a full accounting of all the n sources in your feeds,... too much during bloom will mess with bud quality,...
I'm not a hydro savvy person man, but from what i read with other folks Autopots and AN, they get more stable results when using low ppm water,... have you seen what EC/ppm numbers other folks are running in their res'?


>>> Konop', better thanks! yes, mainly N defc. here, fans getting eaten fast from bottoms up,... heat stress isn't helping,... noted on the N content of the Ca-Mg,... water is pretty hard, so cut out the Ca-Mg now,... I see some color burnishing on that one leaf, could be some P defc. starting, so maybe up the PK some,... you can add a little grow nute's for the N, to slow down the fan snacking a bit, just make sure the PK ratio is well above what N sourcing you add in,.. with that PK booster, you'll be fine...... Removing the leaves after fully yellowing out is OK, the bulk of mobile nutes have been pulled out by then, but generally, I just let them fall off or close to it withered,... too many in higher RH can invite potential fungal attack,...