Read the following statements (A). Saline soils were formerly... | Agrigyan

All Subjects General Agriculture Statistics Soil Fertility Soil Physics Pedology Soil Chemistry Soil Microbiology
106
Soil Science- ICAR JRF/SRF 2024
MCQ (Single Correct)
The founder of the modern pedology who conceptualized the soil as an independent natural body and worked on soil genesis and classification is
107
Soil Science- ICAR JRF/SRF 2024
MCQ (Single Correct)

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:

108
Soil Science- ICAR JRF/SRF 2024
MCQ (Single Correct)
Sensitive crops like vegetables, fruits (citrus) and horticultural crops can tolerate biuret content in urea up to
109
Soil Science- ICAR JRF/SRF 2024
MCQ (Single Correct)

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:

110
Soil Science- ICAR JRF/SRF 2024
MCQ (Single Correct)

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:

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General Agriculture

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Agronomy, Tillage & Field Crop Production Agricultural Entomology, Nematology & Crop Protection Soil Science, Plant Nutrition & Reclamation Cell Biology, Plant Physiology & Biochemistry Agricultural Meteorology & Climate Science Crop Genetics, Plant Breeding & IPR

Pedology

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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

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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

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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

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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)

Statistics

2 Topics
Soil Statistical Analysis: Significance Testing (t-Test, F-Test), Correlation, Regression & Geostatistical Spatial Modeling Soil Experimental Designs: CRD, RBD, Latin Square, Factorial Trials & Split-Plot Designs in Pot and Field Studies Active
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