Western Laboratories Explains soil properties, deficiencies and soil tests. http://www.westernlaboratories.com/instructions/workingwithsoilreports/instructions.html ReviewsRating: Not yet Rated
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Lang Penetrometer A device used to evaluate the resistance to penetration of soils. It gives an indication of the soil compaction. Description with usage information and contact information are included on this site. http://www.langpenetrometer.com ReviewsRating: Not yet Rated
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Prof. Dr. Luis I. Prochnow Describes the research and teaching activities of this soil fertility and fertilizer specialist in Brazil. http://members.aol.com/liprochnow/initial.html ReviewsRating: Not yet Rated
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