Sulphursoil - Delano Development Corporation Page: 4 of 34
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GROWERS TESTING SERVICES
oH AGRICULTURAL LABORATORY
2424 E. VALLEY OAKS DRIVE * SUITE D " VISALIA, CA 93291 * 209-732-TEST * 732-8378
July 31, 1985 R E C E I V E D
Herbert Rogers, Jr. AUG 31985
ROGERS ENGINEERING CD.,INC.
467 Hamilton Ave. - Suite 29 Rgep Eineuing Co, nC.
Palo Alto, CA 94301 FRANCISCO
I apologize for the delay in getting these results to you.
As I explained to you on the phone, the SUL-FE could not be
evaluated by most of our conventional soil test because of the
highly acidic nature of SUL-FE. A saturated paste of the
material you submitted had a pH of 0.6 pH units. The acid
content was determined by mixing a known amount of SUL-FE with
water and titrating the acid mixture with standard Sodium
Hydroxide solution until all available acidity was neutralized.
Expressed in terms of 100% Sulfuric Acid, the SUL-FE displayed an
acid content of 6.3%. Obviously, addition of SUL-FE will have a
direct, immediate effect on an alkakine soil., Also, any
elemental sulfur present will have an additional effect as the
sulfur is oxidized to eventually form Sulfuric Acid.
Is SUL-FE acidic enough to be of value in Western soils with
a Calcium Carbonate content of 1 to 10% ? An acre-6" of soil
weighs approximately 1000 tons and therefore may contain 10 to 100
tons of "free lime". One ton of SUL-FE would contain 0.063 tons
(126 lbs.) of Sulfuric Acid which in turn neutralizes Calcium
Carbonate on essentially a one to one basis (49.04 to 50.04).
An application of one ton of SUL-FE to an acre of calcareous soil
would probably not have much effect on the pH of the soil. There
may be some positive effects for shallow-rooted crops. SUL-FE
should be an excellent source of Iron. Properly designed and
conducted field trials shoud be conducted to establish the value
of SUL-FE as a soil 'amendment.
I hope these comments prove useful to you.
Jerry B. Rivers
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Sulphursoil - Delano Development Corporation, report, June 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc892856/m1/4/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.