Runnoff cannot be trusted.

[jondamon]

May I ask why?

I periodically check my runoff to watch for the flower EC spike that I tend to get.

it’s not something I personally test every day though.

after around week 5 of 12/12 I’ll test once a week to watch for any high leachate spikes which is usually my sign to start backing off my feed towards the latter stages of flowering.

 

[xtsho]

i've run coco hempy buckets for almost 7 years now, and never checked the run off once...

I've been growing for decades and I never heard about it until I read about it on cannabis forums.

 

[MickFoster]

I have never checked run off in decades.........I don't even own a ppm meter.

 

[Star Dog]

I check my run off to see what's happening in the root zone with nutrient uptake.

 

[westpoint]

i've run coco hempy buckets for almost 7 years now, and never checked the run off once...

See.

 

[MickFoster]

See.

See what??

 

[TankHankerous]

Looks like the room is split but I need a ruling.

Runoff ppm in soil, relevant or no?

 

[westpoint]

See what??

that it does not matter what the runoff is, per topic/post.

 

[westpoint]

Looks like the room is split but I need a ruling.

Runoff ppm in soil, relevant or no?

I am in coco, but people will say coco and soil are the same.

 

[twentyeight.threefive]

Looks like the room is split but I need a ruling.

Runoff ppm in soil, relevant or no?

In soil no.

 

[Billy the Mountain]

I am in coco, but people will say coco and soil are the same.

Only uninformed people would say so
They're very, very different mediums

 

[xtsho]

Looks like the room is split but I need a ruling.

Runoff ppm in soil, relevant or no?

It shouldn't be relevant anywhere. If you take care of the substrate and feed properly there will never be any issues and you'll have healthy plants. If you're chasing runoff data then you're doing it wrong.

 

[lusidghost]

It shouldn't be relevant anywhere. If you take care of the substrate and feed properly there will never be any issues and you'll have healthy plants. If you're chasing runoff data then you're doing it wrong.

I would say in a perfect grow this is true, but it is data which can be useful.

That said, I've had seedlings that I checked every day, and you could tell exactly where the plants were consumption wise. This made me want to create an automated system that monitored the runoff and added, subtracted or held the amount of nutrients through a doseatron. I have no idea how to do something like that, but I think it would be the ultimate automated setup.

 

[Billy the Mountain]

Checking runoff EC is by no means a cannabis-specific practice

Runoff EC is a much closer proxy to the actual root zone EC than is the input nute EC

A simple example would be seeing the runoff EC consistently rising with a constant input EC. In this case, the grower should lower their input EC

Once you have things dialed in, it's largely unnecessary, but as mentioned above, it's potentially useful data and shouldn't be dismissed as irrelevant in a hydro grow.

Ignore it at your peril

 

[PJ Diaz]

In my hydroponics class last semester, they devoted an entire module to leachate in soiless media. I'm surprised that you guys haven't heard of it being a thing.

 

[twentyeight.threefive]

In my hydroponics class last semester, they devoted an entire module to leachate in soiless media. I'm surprised that you guys haven't heard of it being a thing.

By the way you talk you’ve been in class for years. You should have your doctorate by now.

 

[PJ Diaz]

By the way you talk you’ve been in class for years. You should have your doctorate by now.

These days I'm only taking one or two classes a semester. Over half of my horticultere classes were taken 25 years ago, then I persued a different career, but more recently decided to take classes again to finish the degree. If I didn't work full time, I would be able to get it much quicker.

 

[twentyeight.threefive]

These days I'm only taking one or two classes a semester. Over half of my horticultere classes were taken 25 years ago, then I persued a different career, but more recently decided to take classes again to finish the degree. If I didn't work full time, I would be able to get it much quicker.

Oh the way you always talked was in the past. Good for you for bettering yourself. For real.

 

[calvin.m16]

Runoff isn't accurate you're correct. You're measuring what has left the pots and drained out of course it's going to read high. I hand water 1 cu/ft of coco with 1 gal of nutrient solution manually once per day 5.8 pH 1.6 EC VEG 1.8>2.0 EC flower and never have any problems. No runoff I just let the drain trays reabsorb everything and hit them once a week (every friday in my case) with plain water.. No problems here pulling 20+ oz a plant doing that and THC testing as high as 28% with strains like Critical Kush from barneys..

 

[calvin.m16]

I am in coco, but people will say coco and soil are the same.

Most people are dumb as fuck. What's new?

Cation and Anion Exchange Capacity And Why It Matters To Your Grow

No need to be intimidated by the science of growing! In this series, Stephen Brookes breaks down technical terms, like cation and anion exchange capacity.

gardenculturemagazine.com