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

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In Brazilian soil fertility management, the base saturation method is widely used to calculate the liming requirement (Necessidade de Calagem - NC). A soil analysis shows an initial base saturation (V1) of 40%, a total cation exchange capacity (CTC at pH 7.0 / T) of 10.0 cmolc/dm³, a target base saturation (V2) of 70% for soybean cultivation, and limestone with a Relative Total Neutralizing Power (PRNT) of 80%. What is the recommended liming rate in metric tons per hectare (t/ha)?

3.75 t/ha, calculated using the standard base saturation equation NC (t/ha) = [(V2 - V1) * T] / PRNT for the arable layer. 5.00 t/ha, calculated using the uncorrected base deficit formula NC (t/ha) = (V2 - V1) / (PRNT * 0.75). 2.40 t/ha, calculated by multiplying the base saturation difference directly by effective CEC without buffer factor. 4.50 t/ha, calculated assuming an uncorrected 100% PRNT limestone requirement for tropical clayey Oxisols.

Correct Answer:

3.75 t/ha, calculated using the standard base saturation equation NC (t/ha) = [(V2 - V1) * T] / PRNT for the arable layer.

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