Soil Preparation and Analysis
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Subject: PH in soils high in om
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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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PatchMaster |
Santa Rosa, CA.
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Is a 6.8 PH ok in a soil high in om or should I be trying to get it to 7?
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2/16/2013 9:59:54 AM
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Engel's Great Pumpkins and Carvings |
Menomonie, WI (mail@gr8pumpkin.net)
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PH fluctuate I would leave it there
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2/16/2013 10:03:11 AM
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matt-man |
Rapid City, SD
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grew PB in ph of 7.4 here
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2/16/2013 11:15:45 AM
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Jeff |
Spanaway
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steve deletas was at 7.3 last year
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2/16/2013 12:52:10 PM
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PatchMaster |
Santa Rosa, CA.
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Matt-man what is your om like. Mine is high and I have read that a lower ph is better in high om soils. I wonder what Don Young's ph was when he grew his 1600's. Hopefully he will read this and reply.
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2/16/2013 1:35:18 PM
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don young |
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spring 2007 om 24.4 ph 7.4 fall 2007 om 22.4 ph 7.1 grew 1662
spring 2009 om 35.6 ph 7.6 i did add sulpher to lower grew 1658, 1622 fall 2009 ph 6.3
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2/16/2013 2:15:20 PM
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PatchMaster |
Santa Rosa, CA.
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Thanks Don. That was fast! So does anyone have experience using oyster shell flour to up the ph and Ca. How much would you use on 750 sf?
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2/16/2013 2:31:33 PM
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Pumpking |
Germany
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Oyster shell powder is CaCO3, just take Bry Langleys soil calculator and add a fertilizer with about 40% calcium, then enter your patch size and your initial calcium concentration...and now vary the amount of your 40% calcium stuff (which represents your oyster shell powder) until you reach your target Ca level. You can´t predict the final pH, because pH depends on so many variables in your soil. The fortunate thing about oyster shell powder (and other CaCO3 powders) is that you won´t get too much above pH 7. (6.8 is very nice already, I started with pH 5.4-5.5 in 2011, had pH 5.8 in 2012 and grew 900lb-ish each year)
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2/16/2013 2:45:56 PM
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Pumpking |
Germany
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http://greatpumpkincommonwealth.com/index.php/resources
There you can find the soil amendment calculator (Langley Soil Estimator).
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2/16/2013 2:47:42 PM
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Kyle K. |
Petaluma,CA
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I used oyster shell powder last year to bring my ph from 6.2 up to 7. Used 5 lbs per 100 sf.
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2/16/2013 2:53:40 PM
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ZAPPA |
Western PA
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Organic matter will generally drop your ph through out the summer, so you may want to get it close to the mid 7's.
Don's is a perfect example.
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2/18/2013 11:32:55 PM
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Total Posts: 11 |
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