PH Falling - Tomatoes

by Mark
(Cincinnati)

I was having trouble with a nutrient batch. I went from
having a lot of blooms to no blooms and could not accurately control the PH.

I changed out my nutrients and bought a better PH meter with calibration solution. Plants responding better. The one tomato plant now has five bloom
clusters. I've become more aggressive with the PH control, adding PH Up 10-20 ml at a time instead of 1-5ml. I'm now keeping it between
5.5 and 6.1, but the PH seems to be dropping quickly.

When the PH is at 5.6, I added 20ml of PH up to get 16 gallons of nutrient to a PH of 6.1. But, the next day, after three pumpings, the PH drops
to 5.9, then the next day its 5.6. I add 20ml of PH up to get it back to 6.1, and it falls the next two days.

Is this normal for tomatoes in the bloom stage? How long can I keep adding PH UP at this rate before it becomes bad for the plants?

The EC measures as 1140ppm.

Also, when I added the 20ml of PH Up tonight, I was watching it hit the surface of the nutrient. I normally just toss it in without looking.
It produced a whitish cloud that dissipated in about 5 seconds. Is that normal?

Thanks,

Mark

Answer from Stella/Simon:

Hi Mark,

The pH of your nutrient solution can follow quite a range from morning to night and day to day. My advice to you is to back off and quit trying to manipulate the pH so aggressively. Too much pH up or down can definitely adversely affect your plants.

Why not just back off and test your pH every four days or so, at the same time each day. As long as your plants look okay, try not to get too wrapped up in the numbers.

Hope this helps!

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Comments for PH Falling - Tomatoes

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May 05, 2014
pH Control
by: Wayne Schultz

This year to keep from going batty over trying to control pH in my tomato reservoir, I purchased a Milwaukee pH controller, MC122.

I just set the level of pH that I want and the controller takes over. The probe feeds the controller the pH level in the reservoir and the controller automatically determines how much adjuastment is required.

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