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Soil Samples Analyses and Interpretation. PPM parts per million average weight of 6 inch soil =2 million pounds 1 ppm = 2 pounds / acre.

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Presentation on theme: "Soil Samples Analyses and Interpretation. PPM parts per million average weight of 6 inch soil =2 million pounds 1 ppm = 2 pounds / acre."— Presentation transcript:

1 Soil Samples Analyses and Interpretation

2 PPM parts per million average weight of 6 inch soil =2 million pounds 1 ppm = 2 pounds / acre

3 pH measure of soil acidity or alkalinity tells if you need lime, not how much active acidity neutral rice < 5 can add lime good above 7 may cause Zn deficiency

4 Buffer pH measure of total acidity used to determine lime requirements of soil

5 Effects Salt May Have On pH if high soluble salts are present, pH may appear lower than actual if you suspect a problem, then you should notify lab

6 CEC Cation Exchange Capacity measure of soils ability to retain and exchange cations determined by the amount of soil colloids that are present

7 Whats A Cation? positively charged ion common soil cations include: –aluminum (Al), calcium (Ca), magnesium (Mg), potassium (K), and sodium (Na) held to colloids in that order –Al tightest –Na weakest

8 Soil Colloids clay organic matter - humus colloids - not small enough to form true solution, too small to settle out negatively charged

9 Different Labs/Businesses Different Recommendations? extraction techniques interpretation philosophy replacement maintenance base saturation


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