Consider a soil with bulk density of 1.43 g/cm³ soil. Sampling the top 7 inches of this soil and measuring the cation exchange capacity (using the ammonium acetate method) results in the following cations exchanged by NH₄⁺: 6.6 cmol Ca²⁺/kg soil, 2.7 cmol Mg²⁺/kg soil, 1.3 cmol K⁺/kg soil, and 1.3 cmol Al³⁺/kg soil. How much K⁺ is present on the CEC in the top 7 inches of each acre of this soil (in ppm K)?

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