ENADE Agronomia Practice Questions - ENADE Agronomia - Exame Nacional De Desempenho Dos Estudantes Exam

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A routine soil fertility analysis from a Cerrado field reports the following values: Ca²⁺ = 2.4 cmolc/dm³, Mg²⁺ = 0.8 cmolc/dm³, K⁺ = 0.3 cmolc/dm³, Al³⁺ = 0.5 cmolc/dm³, and (H + Al) = 3.5 cmolc/dm³. What are the Effective Cation Exchange Capacity (t), Total Cation Exchange Capacity at pH 7.0 (T), and Aluminum Saturation (m%) of this soil?

t = 3.5 cmolc/dm³, T = 7.0 cmolc/dm³, and m% = 14.3% across the entire arable topsoil horizon. t = 4.5 cmolc/dm³, T = 8.0 cmolc/dm³, and m% = 12.5% across the entire arable topsoil horizon. t = 3.2 cmolc/dm³, T = 6.5 cmolc/dm³, and m% = 20.0% across the entire arable topsoil horizon. t = 4.0 cmolc/dm³, T = 7.0 cmolc/dm³, and m% = 12.5% across the entire arable topsoil horizon.

Correct Answer:

t = 4.0 cmolc/dm³, T = 7.0 cmolc/dm³, and m% = 12.5% across the entire arable topsoil horizon.

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