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Discolored seedling leaves, lighting or nutrient?

Posted by NoSupplies z6MO (My Page) on
Tue, Aug 16, 05 at 20:27

Double post, moved to here after suggested to do so.

Each link is where I got information from concerning this problem, I thought I had it figured out. I think I am at least on the right track. When I went to check on my Cherokee Purple this evening one of the leaves had begun to wilt, I think I let the plant grow to close to the light, I was running 24/7 to see if there were any differences than when I ran them 14-16/7. I think what I have done is ran the lights to long and let the plant grow to close to the lighting, 24/7 Lighting allowed the nutrients to be produced quickly, but did not allow the plant to consume the nutrients properly.
Could someone confirm this for me or help me figure out what is going on with the leaves? Am I completely off base with whats going on?

Thank you,
Cherokee Purple Journal

Calcium: Young leaves are affected before older leaves and become distorted, small in size with spotted or necrotic (dead) areas. Bud development is inhibited and root tips may die back. Tipburn on lettuce is a symptom of calcium deficiency but is also caused by other factors not associated with a solution deficiency. Blossom end rot of tomatoes is also caused by a deficiency of calcium within the fruit tissue (not necessary in the nutrient solution), and is more of a `calcium transport' problem within the plant under certain environmental conditions.

Iron: Deficiency shows as a distinct yellowing between the leaf veins which stay green, on the new growth and younger leaves (this distinguishes it from magnesium deficiency which shows first on the older leaves). On crops such as tomatoes, iron deficiency may show when conditions are to cold for uptake, rather than be caused be an actual deficiency in solution

Photosynthesis vs Respiration
In green plants both photosynthesis and respiration occur. In relatively bright light photosynthesis is the dominant process (meaning that the plant produces more food than it uses during respiration). At night, or in the absence of light, photosynthesis essentially ceases, and respiration is the dominant process; the plant consumes food (for growth and other metabolic processes).

Follow-Up Postings:

RE: Discolored seedling leaves, lighting or nutrient?

Well, Joyce, I hop I haven't offended you or given you a so-called bum steer :) I checked out everything you have about the matter and mater and I reckon 24-hours is just a lot of light. I would try the equivalent of what a long-summer's day delivers, ie, 12-14hrs. Another thought: is it cold where you are or why raise under lights? Is theone outside doing much better now?

Wishing you the best with your endeavours, :Grub

RE: Discolored seedling leaves, lighting or nutrient?

not at all, the last couple of seasons I had seen alot of responses to lighting and alot of replies saying 24/7 lighting didn't matter... personally I think it does :))
I ran my lighting 14-16 hours the beginning of this season.

This is just I guess experimaental, Have got to try alot of new things this year, but needed to go back and remind myself of some things (mostly the notes I lost on my Hard Drive)

It's very warm here, has stormed recently, drizzled that last two days and supposed to rain tomorrow but should be back in the 90's later this week (

Thank you

Here is a link that might be useful: CP Photo album (both plants)

RE: Discolored seedling leaves, lighting or nutrient?

It almost looks like the ends of those yellow leaves are a bit crisp? Maybe it jus got too big a whack of UVs? But I really don't know about lights as I haven't, yet, got into this side of seedling raising. It is interesting how the yellowing one is twice the size of the outside one!
Cheers, :Grub

RE: Discolored seedling leaves, lighting or nutrient?

a Big whack of UV is a good possibility, It was fine the 12th, the 13th I noticed the color change. Which means I should of raised the lighting or lowered the plant on the 12th :)

The inside one doesn't have to reach for light, the fan makes the stem stronger.

The outside one had to reach for the light and there was barely a breeze. It's already looking much better since I moved it indoors and potted it up, Which might give it a better chance because it has more stem in the ground for roots.

The outside one that I moved in and potted up will prolly catch up the the yellowing one in just a few days or so. and I think it will have a better root sytem because I was able to bury more of the stem when I potted it up.

The stem is already noticeably thicker.

And there are some of the little notes I lost on my hard drive, but now I have remembered them :)

You should try it just to see the results, Last year I killed all of my seedlings, this year they all survived and I started plants for others too. So I'm getting the starting part down, now I want to grow the seedling healthier :)

Thank you

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