Q.106
The founder of the modern pedology who conceptualized the soil as an independent natural body and worked on soil
genesis and classification is
Q.107
Read the following statements
(A) . Saline soils were formerly called white alkali because of the deposits of salts on the surface following evaporation
(B) . Saline soils have an electrical conductivity of the saturated extract EC > 4 dS mt
(C) . Saline soils have pH > 8.5
(D) . They have exchangeable sodium percentage (ESP) <15%.
Choose the correct answer from the options given below:
Q.108
Sensitive crops like vegetables, fruits (citrus) and horticultural crops can tolerate biuret content in urea up to
Q.109
The main objectives of soil testing are:
(A) . To evaluate soil fertility status for making fertilizer recommendations for a specific
crop, field and farming situations.
(B) . To predict crop response to fertilizer application
(C) . To classify soils into different fertility groups such as low, medium and high
categories of soil fertility maps.
(D) . To identify the type and extent of soil-related problems like salinity, alkalinity and
acidity and to suggest appropriate reclamation/amelioration measures
Choose the correct answer from the options given below:
Q.110
The primary processes involved in salt accumulation in soils are
(A) . Weathering of rocks and parent materials.
(B) . Low water table with less evaporative demand
(C) . Excessive application of salts in fertilizer, animal manure, or compost.
(D) . Poor quality (high salt) irrigation water; irrigation mismanagement, with poor
internal soil drainage
Choose the correct answer from the options given below:
General Agriculture
6 TopicsPedology
4 Topics
Dokuchaev Pedological Concepts, Soil Profile Horizons & Comprehensive Soil Taxonomy (12 Soil Orders, Epipedons, Subsurface Horizons)
Earth's Crust Geochemistry, Rock Weathering, Weathering Indices & Pedogenic Processes (Addition, Loss, Translocation, Transformation)
Soil Survey Methodologies, Remote Sensing, GIS Mapping & Major Soil Groups of India (Alluvial, Black, Red, Laterite, Desert)
Moisture and Temperature Soil Regimes, Land Capability & Fertility Capability Classification (FCC)
Soil Chemistry
3 Topics
Surface Chemistry: Diffuse Double Layer (DDL), Zeta Potential, Cation/Anion Exchange Capacity & Lyotropic Adsorption Series
Soil Organic Matter: Humus Fractionation (Humic, Fulvic, Humin), Carbon-Nitrogen Dynamics & van Bemmelen Factor (1.724)
Clay Mineralogy: Layer Silicates (Kaolinite, Smectite, Illite), Amorphous Minerals & X-Ray Diffraction (XRD) Identification
Soil Fertility
4 Topics
Micronutrient Chemistry (Fe, Mn, Zn, Cu, B, Mo): Ionic Strength, Availability Indices & Chelation Equilibria
Salt-Affected & Problematic Soils Chemistry: Saline vs Sodic Soils, ESP, SAR, Gypsum Requirement & Liming of Acid Soils
Essential Macronutrient Dynamics (N, P, K, S, Ca, Mg): Transformations, Fixation Mechanisms & Soil Solution Equilibrium
Soil Testing Principles, Fertilizer Recommendations (STCR), Plant Analysis, Hidden Hunger & Critical Nutrient Limits
Soil Microbiology
3 Topics
Soil Enzymes (Dehydrogenase, Urease, Phosphatase), Pesticide Biodegradation & Biofertilizer Inoculant Technology
Soil Microbiota Diversity, Rhizosphere Biology & Microbial Ecology (Bacteria, Fungi, Actinomycetes, Protozoa)
Biogeochemical Nutrient Transformations: Nitrogen Fixation (Rhizobium, Azotobacter), Nitrification, Ammonification & P/S/Fe Mobilization
Soil Physics
4 Topics
Soil Water Retention (pF Curve, Suction Scales, Tensiometry) & Saturated Water Flow (Darcy's Law, Hydraulic Conductivity)
Soil Structure, Aggregate Stability, Bulk/Particle Density, Porosity & Crusting Mechanics in Sodic Soils
Soil Texture (Stokes' Law Principles & Limitations), Mechanical Particle Size Analysis & Soil Packing Geometry
Unsaturated Water Flow, Infiltration Kinetics (Philip's Model), Soil Aeration (ODR), Thermal Regimes & Physical Erosion (USLE)
Official PYQ Papers
Previous Year Papers of Soil Science
Practice official shift-wise question papers with answer keys and detailed explanations on the actual exam pattern.
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Total Available
Previous Papers
2024
29-06-2024