High run off EC. Plain water twice in a row?

Grow Support
1

Hey, I’ve got a plant that’s 47 days old and I just flipped to flower 2 days ago. I watered last Thursday the runoff EC came out to 1.9. Then when I fed on Sunday, input was 1.7 and output was 3.0. This means that Salt is building up, medium right?
So if I go by the schedule, I’ve been following, the next time should be just plain water. Should I give it plain water two times in a row instead of alternating feed water feed water? When I check the runoff this next time, what EC reading would tell me to give plain water again or to feed?
Happy frog soil
3 gallon pot
2x2 tent
150w light
Ph is 6.0 (trying to get it up)

2

Feed as necessary to maintain an EC of 2.0 and don’t worry if you are off a bit here and there.

You will know when there is a salt buildup when pH is out of range low and it cannot be corrected. A good flush down to a runoff PPM of 300 to 400 will correct a salt buildup in Happy Frog.

You can avoid a salt buildup by using less salty products such as Jacks 321.

4 Likes
3

Ok good to know. Is that 2.0 number true throughout the rest of the lifecycle? And how much would you say is a little bit off? Is that 3.0 something to worry about?

4

Yes, though you can back off during the last couple of weeks in flowering.

A few hundred PPM.

Only if the plant shows symptoms of nute toxicity. Happy Frog will be hotter than that out of the bag, but the nutrients aren’t such that they will burn a plant. An EC of 3.0 with synthetic nutes may burn a plant.

1 Like
5

So far there aren’t any new signs. The feeding before this brought on some signs. The very tips of a couple of leaves clawed either up or down, which I thought was weird. Figured it would be one or the other. Honestly it was so mild I wasn’t really concerned about it. Two days after a feeding and no new signs. About how long does it take for signs of nute burn to show up? Tomorrow I plan to give plain water with an ec of maybe 0.2 or 0.3, so hopefully that’ll help

6

It will depend on how severe the PPM is. The burned tips or clawing tips you mention are a symptom of either:

  1. pH out of range, or
  2. nitrogen toxicity.

Minor clawing or burned tips aren’t something to worry too much about. It becomes a problem when you get systemic leaf discoloration or dark, waxy leaves.

2 Likes
7

I see, thanks for the information. I guess I won’t worry until I see something to worry about