Hydroponic Tomatoes have yellowing leaves

speckledappleApril 11, 2013

I planted some tomato plants on 3/5/2013.

Seed Type: Super Sweet 100 Hybrid Tomatoes

Water PH: between 5.8 and 6.5

Light Source: 2 - T8 Skylight bulbs

Room Temp: Day 70F Night: 60F

Fan: Open windows provides plenty of air in the room. No fan blowing directly on area

Medium: Coconut coir disks

Setup: 5 gallon gray container

Water Source: tap but phâÂÂed down to get the right ph for garden

Nutrients: davidâÂÂs grow (grow, base) with MagCal and Fulvic acid added midway through the cycle timeframe (as I was worried about nutrient loss)

Airstone: one giant one


As seen in the photos, the leaves are quite yellow with no real reason as to why. Initially when I saw the leaves yellowing I cut off the most yellowed leaves, replaced the nutrient solution and added the fulvic acid and magcal. I also got a light (grolux) that I thought was great for the plants. Today I replaced the grolux with bright t8 skylight bulbs (the closest to sunlight I could find). The stems are purple. Since this is my first time I think maybe it was that I placed too many tomato plants close together (3 essentially very close in one net pot) but with the yellowing it could be some virus also. Any suggestions on where I can grow from here would be great. Thanks.

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Purple stems could be a potassium deficiency. The yellowing looks like an iron deficiency.
Make sure your nutrient contains the deficient nutrients.
Also, make sure the concentration is strong enough.

    Bookmark   April 12, 2013 at 11:51AM
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New growth that appears yellow is sometimes a nitrogen deficiency. Is "David's Grow" a soil nutrient mix or hydroponics?

    Bookmark   April 12, 2013 at 4:07PM
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you think it could be the light? david's grow is purely hydroponic nutrient mix.

    Bookmark   April 12, 2013 at 5:54PM
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The plants aren't "leggy" so light is not the issue.

    Bookmark   April 12, 2013 at 7:51PM
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what can I do to remedy the lack of nitrogen? davids grow seems to have a substantial amount.

    Bookmark   April 13, 2013 at 2:11AM
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Well, the only way would be to add more fertilizer to the reservoir. Do you have a way to measure the EC/ppm of your solution?

    Bookmark   April 13, 2013 at 2:19AM
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Not at the moment but since it is only a 5 gallon bucket, I am thinking of scraping the plants as they look pretty damaged and just start more but this time with the right mix of fertilizer.

    Bookmark   April 13, 2013 at 2:22AM
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The plants will recover in a few days, just give more fertilizer/nutrients and give them a chance. Tomatoes are tough and can take some abuse. Add more nutrients and see what happens.

    Bookmark   April 13, 2013 at 9:22AM
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