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Plain Talk About  Soil Chemistry Linda J. Brewer College of Agriculture Oregon State University
Fact #1: Plant nutrients must  be dissolved in water.
Fact #2: Dissolve-ability  impacts availability. ,[object Object],[object Object],[object Object]
Fact #3: Roots are fussy  shoppers. ,[object Object],[object Object]
Fact #4: Ammonia and  ammonium fertilizers  acidify soil.
Fact #5:Like diamonds, clay  soils are forever.
Pop Quiz: What is the charge on soils?
Fact #6: Soils have a  negative charge.
Fact #7: Attraction is everything in fertility management. ,[object Object],[object Object],[object Object],[object Object],[object Object]
 
Cation Exchange is a Swap Meet. H + Al +3 Ca +2 Ca +2 Mg +2 K + K + H + H + H + H + Plant root Soil
Fact #8: Lime comes in 2 flavors ,[object Object],[object Object],[object Object],[object Object]
Fact #9: Right soil pH unlocks  nutrient availability. ,[object Object],[object Object]
Soil pH & Nutrient Availability
Fact #10: Home soil test kits  are OK . . . maybe ,[object Object],[object Object]
Summing it all up: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Linda J. Brewer Faculty Research Assistant Oregon State University College of Agriculture 541-737-1408 [email_address]

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Plain Talk About Soil Chemistry

Editor's Notes

  1. Shopping for cereal with a two year old. The example of grass containing protein – but we don’t want it, and cattle don’t eat steaks Microbiology, pH and Temperature impact nutrient forms
  2. Soils have negative charge Nutrients have positive or negative charge You might have heard these terms
  3. I learned that not everyone remembers “opposites attract,” so it is good to say it. Might also mention that e.g., K+ is an important plant nutrient?
  4. Cation Exchange is trading: Plants trade what they cannot use for what they can. The soil acts as like the old drive-in movie theater.
  5. Soil pH influences plant nutrient availability. The chemistry behind soil pH is well understood, liming produces predictable responses
  6. Note that the greatest number of nutrients are non-limiting around pH 6 to 6.5. When bars touch top of their “band” (e.g., manganese, aluminum, iron, zinc at low pH and molybdenum at high pH), the element is available to the extent it becomes TOXIC. The low dip (e.g., in potassium around pH 8) means maximal availability of a “competing” ion OR binding by the mentioned ion (calcium+P = apatite, the stuff that makes up bones. VERY insoluble!) makes the ion in question (potassium/phosphorus) limiting. Call out Boron for the growers. Plants with really high nutrient requirements grow best at the middle pH Microbial activity impacted at xtremely lo and hi