ENADE Agronomia Practice Questions - ENADE Agronomia - Exame Nacional de Desempenho dos Estudantes Exam - ENADE Agronomia Practice Questions - ENADE Agronomia - Exame Nacional de Desempenho dos Estudantes Exam

Question 1

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.

Question 2

When managing highly weathered Cerrado Oxisols (Latossolos) with low cation exchange capacity and high exchangeable aluminum, agronomists often compare the base saturation method with the aluminum neutralization method for liming. Under which soil chemical condition is the aluminum neutralization method specifically prioritized?

In coarse sandy soils with low organic matter where the base saturation method would excessively raise soil pH above neutral alkaline thresholds. In highly weathered soils with very low CTC (T < 4.0 cmolc/dm³) where base saturation equations might underestimate aluminum toxicity. In fertile alluvial soils exhibiting high exchangeable calcium and magnesium levels above standard saturation limits. In alkaline sodic soils where exchangeable sodium percentage exceeds 15% and requires calcium sulfate remediation.

Correct Answer:

In highly weathered soils with very low CTC (T < 4.0 cmolc/dm³) where base saturation equations might underestimate aluminum toxicity.

Question 3

Agricultural phosphogypsum (gesso agrícola - CaSO4.2H2O) is an essential subsoil conditioner in tropical agriculture. Which set of chemical criteria in the 20-40 cm or 40-60 cm soil layer indicates a technical recommendation for phosphogypsum application (gessagem) in grain cropping systems?

pH in water > 6.5, base saturation (V%) > 75%, and exchangeable aluminum (Al³⁺) < 0.1 cmolc/dm³ in the subsoil. Available phosphorus (Mehlich-1) < 5 mg/dm³, exchangeable potassium < 0.15 cmolc/dm³, and high organic matter content in subsoil. Exchangeable Ca²⁺ < 0.5 cmolc/dm³, and/or aluminum saturation (m%) > 20%, and/or exchangeable Al³⁺ > 0.5 cmolc/dm³ in subsoil. Electrical conductivity (ECe) > 4.0 dS/m, exchangeable sodium percentage (ESP) < 5%, and low sulfate content.

Correct Answer:

Exchangeable Ca²⁺ < 0.5 cmolc/dm³, and/or aluminum saturation (m%) > 20%, and/or exchangeable Al³⁺ > 0.5 cmolc/dm³ in subsoil.

Question 4

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.

Question 5

Soil water retention and availability are governed by soil matric potential. What matric potential values are standardly defined in agronomy for Field Capacity (Capacidade de Campo - CC) in tropical soils and Permanent Wilting Point (Ponto de Murcha Permanente - PMP)?

-10 to -33 kPa (-0.10 to -0.33 bar) for Field Capacity and -1500 kPa (-15 bar) for Permanent Wilting Point in tropical soils. -100 to -300 kPa (-1.0 to -3.0 bar) for Field Capacity and -3000 kPa (-30 bar) for Permanent Wilting Point. -0.1 to -1.0 kPa (-0.001 to -0.01 bar) for Field Capacity and -100 kPa (-1.0 bar) for Permanent Wilting Point. -33 to -50 kPa (-0.33 to -0.50 bar) for Field Capacity and -500 kPa (-5.0 bar) for Permanent Wilting Point.

Correct Answer:

-10 to -33 kPa (-0.10 to -0.33 bar) for Field Capacity and -1500 kPa (-15 bar) for Permanent Wilting Point in tropical soils.

Question 1

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Prepare with the ENADE Agronomia Practice Questions - ENADE Agronomia - Exame Nacional de Desempenho dos Estudantes Exam practice quiz. This question bank includes 100 questions covering soil, soybean, physiological, crop, and plant. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ENADE Agronomia Practice Questions - ENADE Agronomia - Exame Nacional de Desempenho dos Estudantes Exam

This practice set contains 100 questions from the matching question bank and focuses on soil, soybean, physiological, crop, and plant. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

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