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

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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.

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