PPM for lettuces? PPM for brassicas?

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Greens
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PPM for lettuces? PPM for brassicas?

Several years ago, I used my own seeds with an EC meter.
Now I'm starting again, but my meter is PPM.
Can you please tell me:
  1. The recommended PPM for lettuces?
  2. The recommended PPM for brassicas?
(The PPM for herbs is the same as for brassicas, isn't it?)

Thanks for helping me with my re-entry to AG!
 

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parks1510
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I don't ever think my ppm was

I don't ever think my ppm was ever over 800 for greens. That was on a 10-gallon Rubbermaid tote under an LED grow light. I grew both lettuce and pac choi.

Mike

parks1510
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No, my water in west Michigan

No, my water in west Michigan isn't bad for hardness. I wanted to make the GH FloraGro work, but the pH was all over the place. When I switched, no more problems. Greeens and Herbs are perfect. No muss, no fuss. They aren't as good for tomatoes and peppers though. I saw less yield on both peppers and tomatoes. I'm sticking with GH for those.

Mike

parks1510
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When I was measuring, I tried

When I was measuring, I tried to keep greens at 6-700 ppm. But I found a product I really like. Growth Technology IONIC Grow. With that I add 4 tsp. per gallon tap water. I just keep adding water as necessary. I replace the water after a month. No measuring, and perfect greens in my DWC totes. I use 6 ml. AG nutes in the AG's.

Mike

Ginger
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Interesting, Mike! Do you use

Interesting, Mike! Do you use the hard water Ionic Grow? My tap water is downright crusty, and I get tired of managing enough rainwater to dump and refill every week. That, and rainwater has been unreliable this year. Pretty near drought in Connecticut this summer - but I didn't grow indoors this summer. Collecting rainwater in winter is problematic, too.

I've been using Urban Farm Fertilizers mostly, lately. Another 1-step.

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Ginger
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That's the concentration I

That's the concentration I use for lettuce. I also use it for brassicas and herbs.

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Greens
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Thanks, Ginger.

Thanks, Ginger.
But wouldn't the concentration for brassicas burn the lettuces? (I've done it before smiley )

4 Classic 7s
I only grow greens... no flowers or fruit.

Ginger
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Hi Greens, welcome.

Hi Greens, welcome. smiley

I have an EC meter myself, but according to this, the conversion is EC x 500 = ppm. I use around 1.5 EC for lettuce and brassicas, so that would be 750 ppm. After they're 2 weeks old. Before that, I'd use 0.8 EC x 500 = 400 ppm.

Moderator. Author of Indoor SaladEcigs 102, and the Calm Act climate apocalyptic series.

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