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Denver, CO

Can someone tell me if this right?

I think I take the lbs per acre and divide by 2.72 .

So for example if my soil test indicates 9050 lbs/acre of Calcium then it would be about 3327 ppm.

Is this a correct ratio or is it somthing else alltogether?
Thanks!

2/7/2009 2:33:13 PM

Boulder County Colorado USA planet Earth

Greg call the extension office and ask em. they prob have the formula.

2/7/2009 3:02:30 PM

Santa Rosa, CA

Greg,

When I send a soil sample to A & L Labs, they have a box to check for pounds per 1,000 square feet and a box for pounds per acre. Keep that in mind if you have a choice on the next soil test.

On this one, an acre of land has 43,560 square feet. To convert to 1,000 square feet, divide 43,560 by 1,000 and you get 43.56.

If you need 9,050 pounds of calcium per acre, you would only need 207.76 pounds per 1,000 square feet of patch area. (9,050/43.56 = 207.76).

Perhaps another grower will be able confirm my math or maybe the extension office can confirm how much you need per 1,000 square feet.

You want to make sure you put on the right amount of amendments. Good luck!

Chuck

2/9/2009 6:01:16 PM

Picton,ON (j.vincent@xplornet.ca)

To convert pounds per acre to PPM, divide by 2. Soil samples are calibrated based on the top 6" of soil over a 1 acre area weighs aprox 2 million lbs!

2/9/2009 7:31:35 PM

Ctpumpkin@optonline.net

Correct. Mould board depth of a plow.

2/9/2009 9:20:05 PM

Denver, CO

Wow. Thanks everyone.
I thought that PPM stood for PARTS per millon.
You guys are saying it stands for POUNDS per millon.

Guess I learn somthing new everyday LOL.

Thank you very much!!

2/10/2009 9:37:49 PM

Windsor, Ontario, Canada

It does stand for parts per million.

Your 9050 lbs/acre works out to be 9050 lbs (or 9050 parts) in 2,000,000 lbs (2,000,000 parts).

To get parts per million, we divide the 2,000,000 in half.

That leaves us with 4050 lbs in 1,000,000.

So 4050 pounds in 1,000,000 pounds is 4050 parts per million parts...since 1 part (of a million pounds) is 1 pound.

2/10/2009 11:35:10 PM

Denver, CO

Thanks Jordan! I hate it when my math teachers were right so long ago . . . I should have paid attention LOL

2/24/2009 7:49:54 PM