Correct pH for soil...

[SeaLevelGrower]

If your soil is either acid or alkaline, would you need to adjust your water/nute pH accordingly? For instance, my girls are suffering from lockout due to soil being slightly alkaline. In order for my runoff to come out at a pH of 6.5, I had to flush with plain water pH'd at 5.1. My question is, should I always feed/water with a pH of 5.1(+/- depending to run off)? Or do I continue to feed/water with a pH of 6.3-6.7? The goal is to have a soil runoff pH of 6.5 correct? I was feeding/watering with 6.5pH, but my run off was approx 7.1 pH.

Thanks.


SLG

SeaLevelGrower Reviewed by SeaLevelGrower on 11-27-2010. Correct pH for soil... If your soil is either acid or alkaline, would you need to adjust your water/nute pH accordingly? For instance, my girls are suffering from lockout due to soil being slightly alkaline. In order for my runoff to come out at a pH of 6.5, I had to flush with plain water pH'd at 5.1. My question is, should I always feed/water with a pH of 5.1(+/- depending to run off)? Or do I continue to feed/water with a pH of 6.3-6.7? The goal is to have a soil runoff pH of 6.5 correct? I was Rating: 5

[GetThisOrDie]

What kind of soil are you using?

[GetThisOrDie]

You should be able to correct it with a good flush with the proper ph water. You can also continue to water/feed at an adjusted ph until the runoff is correct. Then proceed to use corrected water again.

Make sense?

Here is a sticky which the topic is explained more by someone with much more experience than me.

http://boards.cannabis.com/plant-pro...hy-how-do.html


I asked your soil type because some commercially available soils use certain ingredients that can gradually change the PH over time. Like pine bark chips.

[canniwhatsis]

My experience with FFOF is it is alkaline, I feed inbound at 6.0 and get a runoff of about 7.0-7.1 on fresh soil tho over time that wears down.

I try to keep inbound between 6.0-6.5 and haven't really had any problems.


That is until recently when my Pen got out of calibration and I started PHing inbound to 5.5 and less! (Didn't know it because the pen was whacked)

Now I'm still suffering the effects of it, even tho my inbound is in line again.

Inbound of 6.0, Outbound of 7.1 is a soil average of 6.55...... that's pretty f'n close in my book! :jointsmile:

[canniwhatsis]

You should be able to correct it with a good flush with the proper ph water. You can also continue to water/feed at an adjusted ph until the runoff is correct. Then proceed to use corrected water again.

Make sense?

Here is a sticky which the topic is explained more by someone with much more experience than me.

http://boards.cannabis.com/plant-pro...hy-how-do.html


I asked your soil type because some commercially available soils use certain ingredients that can gradually change the PH over time. Like pine bark chips.

Read the first few posts there,... good info! :thumbsup:

I'm gonna have to set some time aside to read the rest of that thread, ATM I'm not so concerned with outbound (runoff) PH as it doesn't seem a very accurate measurement.

Just my :glugglug: $.02

[SeaLevelGrower]

I will start off with an ingoing of 6.0 like you said and see how that affects the run off. If my run off is still high (+7.0 pH) should I try a little lower on the ingoing...say 5.8 or so?

The soil is basic crap from the hardware store...next round of soil will be "ROOTS".

tHANKS

[MadSativa]

if your soil ph needs to go lower add some sulfur or aluminum sulfate, sold everywhere, everywhere like nursery's, some walmarts and home depots.

[SeaLevelGrower]

@Madsativa: how do I use them? Im not sure exactly what the pH of my soil is. I got a good deal on some basic potting soil at the hardware store, so I added some perlite to it and viola! It doesnt mention what the pH levels of the soil are though...but I can tell that it is alkaline after the lockout problems I am having. How can I test the pH of the soil before I even use it?

[MadSativa]

to check soil Ph usually you can check your runoff or waste water (water from the bottom of the pot). to do this water the plant let it sit for about 10 mins then re water so you get a good cup or 2 of the runoff, then collect it. let the sediment settle for about 5-10 mins, then use a Ph tester to check the Ph of that runoff water (water from the bottom of the pot).
Usually everyone uses a Ph tester which is a drop solution and a little vial. there are different Ph testers with the best being digital, but the droppers is a standard, its what almost everyone uses, especially when starting the kit is about 6 dollars vs 100 for a digital Ph pen type.

pH Test Kit by General Hydroponics | pH & TDS Testing

more than likely you need to add some dolomite lime to you pots , but do a Ph test first, dolomite can be added to the topsoil so no need to dig up the plant. dolomite lime raises the Ph of the soil as most soil is low in Ph

[MadSativa]

Read the first few posts there,... good info! :thumbsup:

I'm gonna have to set some time aside to read the rest of that thread, ATM I'm not so concerned with outbound (runoff) PH as it doesn't seem a very accurate measurement.

Just my :glugglug: $.02

its not but if you have a reading of 4 or 8 then their is the problem. accuracy is better with a digital pen then a dropper kit but runoff is important in diagnosing.