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Answer the following questions for the soil data listed below.
Exchangeable Cations Cations in Saturated Extract
(ppm Soil) (ppm solution)
Ca 1600 180
Mg 600 20
Na 1000 900
K 600 5
CEC (me/100g) = 17 pH (sat'd paste) = 8.6
CaCO3 (%) = 2 ECse (mmho/cm) = 4.5
a. Calculate CEC and compare with measured CEC. Suggest a reason why the two values may be different.
b. Calculate SAR and estimate SAR from the exchangeable cation data.
c. Calculate and estimate ESR and ESP.
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