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Edinburg Va.

I'm wondering how much gypsum is needed per 1000 sq. ft. to raise the soil level to 3000 ppm assuming the current level is zero?

10/30/2007 12:18:13 PM

Ctpumpkin@optonline.net

Soil cannot have zero Calcium so there is no equation that can be applied to this case.

That said ppm x 3.6 = Pounds per Acre foot

If you supply a real soil test result for available calcium we can walk through the calculations.

10/30/2007 1:57:27 PM

Windsor, Ontario, Canada

Suppose you have 3000ppm and you want to get to 4000ppm. Assume granular gypsum (22% Ca). What would it take per 1000 square feet?

10/30/2007 2:30:23 PM

Edinburg Va.

I gave a current level of zero to keep it simple for my simple mind. sorry. K =180 Mg=165 Ca=810 I want to increase Mg to 300 and Ca to 3000.

10/30/2007 7:00:08 PM

Ctpumpkin@optonline.net

"Suppose you have 3000ppm and you want to get to 4000ppm. Assume granular gypsum (22% Ca). What would it take per 1000 square feet?"

1000PPM = 3600 lbs CA per acre foot. Most folks till only to mold board depth (9 inches) so 3600lbs CA X .75 = 2700 lbs CA div by 22% = 12,272 lbs Gypsum per acre div by 43.56 = 281 lbs Gypsum per 1000 sq ft.

"K =180 Mg=165 Ca=810 I want to increase Mg to 300 and Ca to 3000."

We still don't know the pH or CEC. Dolomitic lime would supply both Calcium & Magnesium while raising the pH. Is there "room" in the soil test to use some dolomitic lime?

10/30/2007 11:05:20 PM

Edinburg Va.

The pH was 6.1 and the CEC. is meq/100g =6.8 I've already added 30 lbs of pelletized lime.

10/31/2007 8:21:22 AM

Edinburg Va.

My growing area is 2000 sq. feet. The lime was recommended by my soil lab.

10/31/2007 9:06:53 AM