Soil management Exam with Questions and Answers

Soil management Exam with Questions and Answers A farmer practicing conservation agriculture wants to reduce soil erosion, maintain crop residue on the surface, and improve water infiltration. Which tillage system best supports these objectives? a. Conventional moldboard plowing b. No-tillage system c. Deep inversion tillage d. Repeated harrowing Correct Answer: b. No-tillage system Rationale: No-tillage minimizes soil disturbance and leaves crop residues on the surface, which protects the soil from erosion, improves infiltration, and conserves moisture. In a poorly drained clay soil, excessive use of heavy machinery has resulted in a dense subsurface layer that restricts root growth. Which tillage operation is most appropriate to correct this condition? a. Surface cultivation b. Rotary tillage c. Subsoiling d. Blind harrowing Correct Answer: c. Subsoiling Rationale: Subsoiling breaks compacted layers below normal plow depth, improving root penetration, drainage, and aeration in compacted soils.