Q.34
Which of the following agenda is not contributed by the Intemational year of Millets 2023 to the UN 2030 Agenda for
sustainable development?
Soil Science- ICAR JRF/SRF 2024
Q.35
The time required to complete hydrolysis of urea when applied in normal soil and alkline soils, respectively is
Q.36
Diagnosis and recommendation integrated system (DRIS) approach was developed by:
Q.40
Given below are two statements
Statement (I) : Iron deficiency is most common in upland crops, particularly those grown on the calcareous/alkaline soils of
arid region
Statement (II) : Molybdenum is associated with nitrogenase and nitrate reductase enzymes and is essential for nitrogen
fixing plants and microorganisms
In light of the above statements, choose the most appropriate answer from the options given below.
Q.42
The production of single superphosphate (SSP) involves following operations:
(A) . The powdered rock phosphate (containing 30%-38% total POs) is mixed with sulphuric
acid (65%-75% H»SOa) to form a slurry.
(B) . The wet material is subjected to final curing, when some of the slow reactions reach a state of near completion and
the excess water evaporates. The curing time is 2-6 weeks
(C) . Solidification of the slurry in a den (denning), where continued reactions and crystallization of monocalcium
phosphate take place (time required 0.5 to 4 hours)
(D) . If granular SSP is desired, it can be granulated either before or after it is cured
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
Active
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