9. Jessica has a small farm that has sandy loam texture (65% sand, 20% silt, and 15% clay). On the farm, montmorillonite

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9 Jessica Has A Small Farm That Has Sandy Loam Texture 65 Sand 20 Silt And 15 Clay On The Farm Montmorillonite 1 (29.12 KiB) Viewed 162 times

9. Jessica has a small farm that has sandy loam texture (65% sand, 20% silt, and 15% clay). On the farm, montmorillonite is the only type of clay mineral present. Jessica wants to add organic matter to the farm. Assume the organic matter has a CEC = 200 cmol/kg, and that the amount added would be equivalent to 5% soil organic matter. a) Estimate the CEC for soil before the addition of organic matter. Show formulas and units. [Hint: assume sand and silt have negligible CEC] Organic matter% x 200 cmol/kg + clay% x 50 cmol/kg = CEC b) Determine the CEC for soil after the addition of organic matter. Show formulas and units. [2 points]