Fertilizing and Watering
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Subject: How mush gypsum?
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From
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Location
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Message
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Date Posted
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Steve22824 |
Edinburg Va.
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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?
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10/30/2007 12:18:13 PM
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Tremor |
Ctpumpkin@optonline.net
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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.
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10/30/2007 1:57:27 PM
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Jordan Rivington (JRO) |
Windsor, Ontario, Canada
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Suppose you have 3000ppm and you want to get to 4000ppm. Assume granular gypsum (22% Ca). What would it take per 1000 square feet?
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10/30/2007 2:30:23 PM
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Steve22824 |
Edinburg Va.
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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.
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10/30/2007 7:00:08 PM
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Tremor |
Ctpumpkin@optonline.net
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"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?
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10/30/2007 11:05:20 PM
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Steve22824 |
Edinburg Va.
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The pH was 6.1 and the CEC. is meq/100g =6.8 I've already added 30 lbs of pelletized lime.
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10/31/2007 8:21:22 AM
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Steve22824 |
Edinburg Va.
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My growing area is 2000 sq. feet. The lime was recommended by my soil lab.
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10/31/2007 9:06:53 AM
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Total Posts: 7 |
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