Watered with 6.7 ph water. Runoff water is 4.8 ph. What should i do?

In flower. 3 gallon pot. Ffof soil. Leaves have a little brownish color starting. Have 9 plants But only 1 plant with this Brownish color on the leaves.

3 answers4 replies

Comments (7)

Mr. Grow It

Dec 02, 2020

How old are these plants? Is this your first time ever measuring the runoff? Also, what's the runoff PPM? I'm wondering if you saw a drastic drop in pH from your previous measurement

Rob Hayes

Dec 03, 2020

Replying to

Calibrated ph meter. Flushed plant with distilled water at 6.5. Runoff tested at 5.68 ph. And ppm was 1010. Leaf edges have curled up today or cupped. Have some brownish spots also they are autos and about 7 weeks old. may be 6 1/2 Tag on it says oct 11

Mr. Grow It

Dec 03, 2020

Replying to

@Rob Hayes The curling and browning is often times due to light burn/stress. What grow light are you using and how far away is it from the top of your plant? Also, what has the temperature range been? Can you show us a pic of the whole plant? If you're in late flowering, the PPM of 1010 is a bit low IMO.

Rob Hayes

Dec 03, 2020

Replying to

I using mars hydro ts 3000. Was 19 inches. Raised it to 23 inches. Leaves feel very dry. Temp has been 78 during day and at 68 at night or lights out for 6 hrs Its in early flowering Should have a few weeks to go

mwhite9829

Dec 02, 2020

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That low of ph will cause all kinds of deficiency issues. I'd flush with higher pH 6.7-6.9, and feed/water a few a times 6.5-6.8 and then check again. I've gonna as far as flushing at 7.0 and feeding a few times at 6.7-6.8.

Brandon

Dec 02, 2020

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Have you Calibrated your ph pen lately? If so I would flush with ph balanced water