This question collection consists of 100 multiple-choice questions, based on the topics covered in the Soil Doctor Certification Exam (primarily levels 3 and 2). Question Areas: • Soil Chemistry (pH, EC, CEC, phosphate absorption coefficient, base saturation, etc.) • Soil Physics (soil hardness, aggregate structure, permeability, water retention, etc.) • Soil Biology (soil microorganisms, continuous cropping disorder, green manure, etc.) • Fertilizers and Fertilizer Management (three major elements, micronutrients, fertilization methods, etc.) • Crop Growth and Nutrition (nutrient absorption, physiological disorders, etc.) • Soil Diagnosis and Improvement (soil diagnosis methods, soil improvement materials, etc.)