Help! Hydroponic tomato deficiency

jamesvladAugust 18, 2010

Hello everyone. I have a hydroponic tomato, but it seems to have a deficiency that I can´t identify...maybe someone can help me.

The nutrient solution composition is:

N 181

P 51

K 267

Ca 123

Mg 42

S 42

using tap water (about 40 ppm of calcium) phosphoric acid as phosphorus source, and some sulfuric acid to adjust pH.

and micronutrients (Fe, Cu , Zn, B, Mo, Mn) but I´m not sure about the concentrations

This is the picture

Thank you for reporting this comment. Undo


This is the link of the picture:

By the you know how to insert images in this forum?

Thanks in advance!

    Bookmark   August 18, 2010 at 2:31PM
Thank you for reporting this comment. Undo
Karen Pease

What is the picture? I see no picture.

I assume your N is NO3?

Note that things other than deficiencies can cause problems. Last year I had a problem with tom survival, and after a lot of experimentation, I determined that it was a phytotoxic reaction to the insecticidal soap I was spraying.

    Bookmark   August 18, 2010 at 2:38PM
Thank you for reporting this comment. Undo
Karen Pease

Ah, I see you fixed it. You add images with <img src="http://YOUR_URL">

    Bookmark   August 18, 2010 at 2:40PM
Thank you for reporting this comment. Undo

Thank you karenkei. Yes my N is NO3 only (Ca(NO3)2, KNO3 and NaNO3, HNO3). I use only the nutrient solution, no more things.

This is the image:

    Bookmark   August 18, 2010 at 9:02PM
Thank you for reporting this comment. Undo

Hello Jamesvlad,

I once had similarly looking plants when doing some experiments with hydrogen carbonate ion concentrations. If you can indeed provide all your 51 ppm of P as phosphoric acid and then you need to add sulfuric acid on top of that to reach a pH around 5.5-6.5 then the problem might be an excess amount of carbonate in your water.

The lack of any chlorosis suggests that there are no micro nutrient or N deficiencies but the leaf deformation and the similar appearance when compared with my experiment plus your description makes me believe that this is the problem. I would suggest you prepare your solution with RO or distilled water from now on and share your results with us once you do this.

I hope this helps !

Best Regards,


    Bookmark   August 19, 2010 at 8:13AM
Thank you for reporting this comment. Undo

Thank you danielfp. Again, you´re right. The hydrogen carbonate concentrations is high. I´ve been using distilled water, and the toxicity is disappearing. The leaf are returning to normal, I´m going to take another photo and insert the picture in two or three days.

    Bookmark   August 25, 2010 at 4:53PM
Thank you for reporting this comment. Undo

10 days ago I changed the nutrient solution (without bicarbonate), I now this is the result:

As you can see, the tomato is returning to normal.

So, for anyone who may have the same problem: the excess of bicarbonate ion could be the problem.

Thanks again danielfp and karenkei.

    Bookmark   August 31, 2010 at 9:31PM
Sign Up to comment
More Discussions
Need Aeroflo 36 in CA!
Looking for a lightly used aeroflo 36 in CA or willing...
PonicsPal the latest in hydroponics growth management software & FREE! Introducing PonicsPal, the latest...
Lettuce is infected
Can anyone tell me what my lettuce is being infected...
Hi all! I'm a beginner at hydroponics gardening......
New to Hydrophonics
Hello all ,Im new to the Hydro thing. Im going to start...
Sponsored Products
Garage Storage Systems & Accessories: Husky Garage Storage Secure Lock Large
$14.97 | Home Depot
Furniture of America Espresso Finish Bicast Storage Bench
Casablanca Down Rods Perma Lock 60 in. Oil-Rubbed Bronze Extension Downrod 63535
$42.00 | Home Depot
Stanley Coastal Living Resort Haven's Harbor Night Stand Stormy Night 062-F3-80
$755.98 | Hayneedle
Honey Can Do Medium Nylon Pop Open Hamper - HMP-01130
$21.99 | Hayneedle
Math Equation Clock
| Dot & Bo
Grey Room-Darkening Backtab Window Valance
$19.99 | Bellacor
Home Decorators Indoor/Outdoor Area Rug: Home Decorators Collection Rugs Legacy
Home Depot
© 2015 Houzz Inc. Houzz® The new way to design your home™