Yellow, brown, and curling leaves, seeking advice

[breedAseed]

This is a closet grow using two waterfarms in a recirculating constant flow set up using drip rings. I have 2 1000L pumps supplying the water from the rez. I used jiffy pellets from seed and transplanted into hydroton after roots stuck out. The pictures are of the plants on day 12 from seed. Using 1 600w full spectrum HPS inside 8x2x5' tent.

Nutrients:
Sea-90 1/2 teaspoon per gallon
GH Micro 1/2 tsp per gallon
GH Grow 1/2 tsp per gallon
Super Tea 2 servings per gallon

Note: I used super tea from day 5-10, rez changed on day 10, GH nutes days 10-12

The plants seemed fine and healthy for the most part till day 8ish when the left plant started to yellow. So I added some tap water to my RO rez to see if it needed some Cal/Mag. Problem got worse so I did a rez change and now they look like the pictures I attached.

I'm not really sure where to go from here. PPM is at 1400 but thats fine since sea solids have higher #s. Idk the ph but cant imagine thats the issue either from previous experience. Now the plant on the right is showing yellow tips as of today and Im worried.

Any advice is greatly appreciated!!

 

[Granger2]

Off the bat, Sea 90. Sea 90 is good occasionally, but the NaCl [salt] has not been removed. I would flush with pH'd water, empty rez, refill with you nutes without Sea 90. Good luck. -granger

 

[EclipseFour20]

Granger is correct but off a wee bit...the "salt" in Sea90 is not your grandmother's tablesalt. I use 5ml of Sea90 per gallon (twice your rate) and never had residual or salt buildup issues (I don't flush....ever!). I incorporate Sea90 in my mineral brew which is delivered every 7-10 days; I have an abundance of growth with zero deficiency issues. If one adds Sea90/minerals to their daily feeding, then two things are occurring: Excess mineralization and wasting $.

l use dry organic fertilizers--no hydro nutes, so maybe "salts" in the GH nutes are not symbiotic with Sea90. I have been using Sea90 for almost 2 years now...and the difference is remarkable and quite noticeable (according to the collective and their members...and so says I!).

Just tossing this out...hope it helps! Cheers!

Oh yeah, I forgot--after delivering the mineral brew (sea90, epsom salts, micronutes, etc)...the next "plant watering" is just that--water; plain everyday water (no RO system here--rather I draw tap water and let it bubble for 24 hours before using). Try that...follow your Sea90 application with plain water a few days later. Not enough to flush...but the normal amount until there is a little runoff (usually 32 to 48 oz for my 5 gallon pot ladies).

BTW...tip on using Sea90: Grind it before using; coffee grinder will reduce the "chunks of goodness" into a nice fluffy consistency that dissolves almost instantly...and it is easy to incorporate into the soil mix as well!

 

[Granger2]

I was talking about the NaCl in the Sea 90. Doesn't matter if it's granny's or Mortons or Sea 90. Using it every 7-10 days is what I referred to as "occasionally." Followed by plain water mitigates the addition of NaCl. I sometimes put it in my teas and it seems beneficial. The problem comes with excessive use. Good luck. -granger

 

[breedAseed]

Thanks for the responses. I am not feeding with sea90 daily I added 1/2 tsp per gallon along with super tea in the beginning. I then left that for 8 days adding tap water when my Rez dropped an inch. The pictures your seeing are the result of doing that.

From what I have read the salt in sea90 is needed by the plant in assisting with the uptake of nutrients. This seems to be true from past experience as well. However, I'm still a little lost.

 

[EclipseFour20]

Granger...the reason why NaCl is not an issue, Sea90 also has 95 other elements (97 in total) that "buffer" the undesirable effects those two bonded elements you identified: sodium and chloride (aka sodium chloride or tablesalt). The elements in Sea90 work in a symbiotic way and when used correctly--great things happen, but overdo it and you have hell to pay (just like water...a plant will die if it receives too much or not enough water).

Now...regarding the OPs yellow brown curling leaves, IF you do not have any deficiency (meaning you know the plant is getting everything it needs) then perhaps you have a signs of "phantom deficiency"--meaning either a pest or pathogen is attacking your plant. Examining the plant's roots and growing medium is something I would do if...as I assumed you inspected the leaves and branches for telltale signs of pests and poo droppings; those little black dots found in the undersides of leaves--both new and old growth.

Cheers!

 

[EclipseFour20]

BTW...the below pdf is a hydroponic recipe using Sea90 that is posted on their website--perhaps the ratio of Sea90 to other elements/nutes/ferts might be helpful.

Good luck!

 

[Wendull C.]

1400 ppm is not fine for those babies.

 

[BigPete]

Yup 1400 sounds to much, they look like they are suffering from overferting.

 

[breedAseed]

EclipseFour20 thank you for the very valuable information. I will surly look at that guide and see if I can apply it.

Just a reminder that when using sea solids your ppm will be higher vs using straight nutes. This is not my first grow and have had no issues using this amount at this stage. I attached two more photos today comparing the two plants. One looks fine and is flourishing and the other seems very sad. Both plants are using the exact same set up, down to the T identical. Which is why I am so perplexed by my issue.

I did inspect the leaves for insect issues and found none. Tonight I will search the roots and report back tomorrow.

 

[Granger2]

Eclipse,
I believe we are saying the same thing. All things in moderation. -granger

 

[breedAseed]

I took a look at the few roots that have hit the water and all seem fine. Is it possible that maybe this is overfert since the plant it getting food from drip ring and now from roots in water? My other plant is now showing signs of the same issue and can be seen in the attached pictures.

Its weird that both plants seem fine until they get to about this size and start showing the issue.

 

[breedAseed]

2 days after my last post and I checked back. I attached pictures of the babies and they seem to be doing fine. There is still some curling and yellow discoloring but they have grown a lot.

If ppm was too high would they still grow like this? The new leaves seem to be green and healthy but they do look a bit on the light side.

Any recommendations are very welcome as I have tried to incorporate a lot of what I have read here.