#1  
Old 04-18-2012, 05:00 PM
LawnsharkMB LawnsharkMB is offline
LawnSite Senior Member
 
Join Date: Sep 2011
Location: Myrtle Beach, SC
Posts: 449
Lowering PH,

What is the fastest and safest way to lower the ph of a lawn? I have 7 lawns that the ph is 7.0 to 7.4. All are centipede. I have never applied sulfur to a lawn before. I have read that aluminum sulfate is the quickest but it will burn the lawn. I know SCU and ammonium sulfate will lower the ph but doesn't this take a while? Thanks for any advice in advance.
Reply With Quote
  #2  
Old 04-18-2012, 06:49 PM
RAlmaroad RAlmaroad is offline
LawnSite Silver Member
 
Join Date: Dec 2006
Location: SC
Posts: 2,028
Landshark:
I'm in the region also. Sulfur with 10%dolemite (clay) does a great job on our sandy soil. I buy the flakes and spread it at 10lb/K. It needs warm soil to activate it. It brakes down rather quickly. Your centipede will do great if you use ammonium sulfate (21-0-0)@ 1/2lb/K which is a sulfur based Nitrogen. I bet you are a granular guy! Luckily, it can be had in the granular form. I use 14-0-46 liquid and boost it with the ammonium + iron and micros.
Lesco has the sulfur but it is way too high. I get mine from the co-op at about half of their price. I put it down in November and then again in April and just waited on the heat.
__________________
We all are merely gleaners from the masters who were here before us.
Reply With Quote
  #3  
Old 04-18-2012, 09:35 PM
Ric's Avatar
Ric Ric is offline
LawnSite Fanatic
 
Join Date: Sep 2001
Location: S W Florida
Posts: 11,742
..


10 pound per thousand sq ft of 0-0-0-90 Sulfur with 10% Bentonite not dolomite will lower pH one point in 30 days. pH is the inverse logarithm of the hydrogen Ion in a solution. Therefore as a Inverse, the More hydrogen atoms the lower the pH number. Small p in math stands to an inverse and the capital H stands for Hydrogen.



..
__________________
.

it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.

You can lead a Donkey to water but you can't make the Jackass Drink

My People Skills are Fine. It is my Idiot Tolerance Skills That needs Work.

.
Reply With Quote
  #4  
Old 04-29-2012, 09:39 AM
Kiril Kiril is offline
LawnSite Fanatic
 
Join Date: Jun 2007
Location: District 9 CA
Posts: 18,329
This is the equation for pH, it is NOT an inverse log, it is a negative log.

pH = -log [H+]

The inverse log (or better known as the exponent) of the negative of the pH is the hydrogen ion concentration.

[H+] = 10^(-pH)


Example:

If I have a [H+] = 0.0002, what is the pH?
pH = -log(0.0002) = 3.70
If I have a pH = 3.70 what is the [H+]?
[H+] = 10^(-3.70) = 0.0002

Last edited by Kiril; 04-29-2012 at 09:45 AM.
Reply With Quote
  #5  
Old 04-29-2012, 11:13 AM
Ric's Avatar
Ric Ric is offline
LawnSite Fanatic
 
Join Date: Sep 2001
Location: S W Florida
Posts: 11,742
Quote:
Originally Posted by Kiril View Post
This is the equation for pH, it is NOT an inverse log, it is a negative log.

pH = -log [H+]

The inverse log (or better known as the exponent) of the negative of the pH is the hydrogen ion concentration.

[H+] = 10^(-pH)


Example:

If I have a [H+] = 0.0002, what is the pH?
pH = -log(0.0002) = 3.70
If I have a pH = 3.70 what is the [H+]?
[H+] = 10^(-3.70) = 0.0002

My Bad, I am getting old and have CRS. The negative log is a Inverse of the positive log. In the case of pH, the measurement of Hydrogen ions in a solution is a reverse of numbers. The higher the pH, the lower amount of Hydrogen ions. The lower the pH the higher the Hydrogen ion count.


.
__________________
.

it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.

You can lead a Donkey to water but you can't make the Jackass Drink

My People Skills are Fine. It is my Idiot Tolerance Skills That needs Work.

.
Reply With Quote
  #6  
Old 04-29-2012, 12:05 PM
Kiril Kiril is offline
LawnSite Fanatic
 
Join Date: Jun 2007
Location: District 9 CA
Posts: 18,329
logarithmic functions are inversely related to the exponential function is the easiest way to remember it, at least for me.

logbx is the inverse of b^x where b = base

I think the most important relation to remember here for most people is for every unit change in pH, there is a 10 fold change in [H+]

Using the example above, increasing pH to 4.7 reduces [H+] by a factor of 10.

[H+] = 10^(-4.70) = 0.00002

Last edited by Kiril; 04-29-2012 at 12:11 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Layout Style:




Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 11:56 PM.

Page generated in 0.08292 seconds with 8 queries