Soil Preparation and Analysis
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Subject: Petman's Turn at Soil Analysis Help
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Location
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Message
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Date Posted
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Petman |
Danville, CA (petman2@yahoo.com)
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So here are the results at long last...
Organic Matter 1.9% Est. Nitrogen Release 67 lbs/acre Rate - Low Phosphorus 138 ppm Rate - Very High Potassium 157 ppm Rate - Medium Magnesium 720 ppm Rate - High Calcium 4710 ppm Rate - Very High Sodium 97 ppm Rate - Very Low Soil pH 7.5 CEC 30.4 milli-equiv/100 grams
Percent Base Saturation K 1.3% MG 19.8% CA 77.5% NA 1.4%
Sulfur SO4-S 18.0 ppm Rate - Medium Zinc 10.2 ppm Rate - Very High Manganese 65.0 ppm Rate - Very High Iron 106.0 ppm Rate - Very High Copper 3.2 ppm Rate - Very High Boron 1.6 ppm Rate - High Soluble Salts .22 ms/cm Rate - Very Low
Soil Fertility Recommendations for Cucurbita
Nitrogen - 80 pounds per acre Phosphate - 40 pounds per acre Potash - 80 pounds per acre Sulfur - 10 pounds per acre
Use ammonium sulfate as all or portion of N requirement to lower pH.
For best results, apply 20-40 pounds P2O5 and 20-30 pounds K2O as a side placement application. Substrate from the amount recommended then broadcast the rest if any.
Cation exchange may be over estimated due to high pH and free lime in the soil.
I took this sample from around the patch, mixed up the dirt and then screened it to get it to a small size (a little smaller than a choc chip) and then sent it in.
Since then, I added 25 yards of manure, 3 bales of straw and a cover crop over the 1/4 acre area. I will test again in EARLY spring, but what would you recommend now?
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11/29/2006 1:21:26 PM
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Big Kahuna 25 |
Ontario, Canada.
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Petman, OM is really low on your virgin soil. I know you need more as we like to see this number approach 10% or greater. It may take you a few years to reach this number without knocking the rest of the soil out of whack. By this I mean adding too much manure can drive up Phos. levels to the point where no beneficial fungi would survive for long periods. Consider any and all sources of older types of composted well rotted OM. I like see Phos numbers below 100ppm to allow the beneficials to thrive for long periods on your plants roots. You are headed in the right direction with Ammonium Sulfate but instead consider other sources to modify the PH and add N. Alfalfa meal for N and peat moss to lower pH are two good alternatives.
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11/29/2006 6:32:06 PM
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WiZZy |
President - GPC
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http://www.ext.colostate.edu/Pubs/Garden/07840.html
Everything you wanted to know about dirt.......for soil improvement, ammendments, composting, worms........pretty good organic info for alkaline soil types..
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11/30/2006 10:22:36 AM
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Total Posts: 3 |
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