Soil Science — Agri Master Mind
What is the rearrangement of soil solid with the removal of gaseous and liquid phase accompanied by volume change and increase in bulk density known as ?
- Soil Compaction
- Soil Aggregate
- Soil Structure
- Soil Consolidation
- Soil Consistency
What is the Cation exchange capacity (C mol (p+) kg-1 soil) of vermiculite?
- 3-15
- 15-40
- 80-100
- 100-150
- >200
With each unit increase in soil pH the acid content in the soil is decreased by...... fold?
- 10
- 0.1
- 400
- 1000
- 0.01
Breaking down of soil aggregates due to excessive tillage operation (puddling) causes in Bulk density?
- First Decreased than Increased
- First Increase than decrease
- Increase
- No Change
- Decrease
Sedimentary rocks are formed from consolidation of sediments over a period of time so the epithet for this rock is?
- Layered RockS
- Stratified Rock
- Clastic Rock
- Aqueous Rock
- None of these
The sum total of the exchangeable cations that a soil can absorb is known as "Cation Exchange Capacity". What is the unit of CEC ?
- Mole/liter
- Meq/100 g
- Meq/liter
- Meq/g
- Mole/100g
Which soil particle is loose and friable, hold little water and allow rapid evaporation and percolation?
- Loam
- Peat
- Sand
- Clay
- Silt
Which of the following land is not suitable for agriculture but well suited for forestry, grassland and wildlife?
- Class I to V
- Class V to VI
- Class IV to VIII
- Class I to Class II
- Class VII to VIII
Soil electrical conductivity, referred to as EC, is the ability of soil to conduct (transmit) or attenuate electrical current. What is the EC of Saline water?
- 4.5 ds/m
- 5-10 ds/m
- 1.5-3 ds/m
- 3-5 ds/m
- <1.5 ds/m
There are two Si sheets and one Al sheet in 2:1 type minerals. Which of the following is a fully expanding 2:1 type of mineral?
- Montmorillonite
- Vermiculite
- Biotite
- Ilitw
- Muscovite
C:N Ratio of humus is?
- 4:1-4:9
- 100:1
- 10:1
- 20:1 – 30:1
- None of the above
What is the term used when the constituent of soil in solution form percolate from the upper layer to the lower layer?
- Illuviation
- Eluviation
- Percolation
- Leaching
- Runoff
Soil colour determination chroma refers to which of the following?
- Purity or Strength of Colour
- Dominant Spectral Colour
- Lightness or darkness of the colour
- Amount of reflected light
- All of the above
Total number of master horizons present in soil are
- 4
- 7
- 6
- 5
- 3
The relative proportion of sand,silt and clay in a soil is known
- Soil Structure
- Soil Texture
- Soil Taxonomy
- Soil Aggregation
- Soil Consistency
Value of C2 water class is 0.25 -0.75 than value of S3 water class is
- 0-10
- 2.25-5.00
- 18-26
- 10-18
- 25-30
Clay loam soil is also known as best soil than composition of clay loam soil is?
- Clay-5-10%, OM- 5-10%, Silt-30%
- Clay-30%, OM- 5-10%, Silt-30%
- Clay-5-10%, OM- 5-10%, Silt-15%
- Clay-10-20%, OM- 5-10%, Silt-30%
- None of the above
Who is considered as father of soil testing
- Cowell
- Troug
- Dokuchaev
- Puri
- Winogradsky
As per NABARD , Liming requirements (Kg/ha) for soil whose pH is 9.
- 5000
- 1000
- Nil
- 1500
- 500
Which of the following Water is available to plant?
- Hollard
- Chresard
- Echard
- Both A and B
- All of These
Silicate which are source of plant nutrient is not correct match
- Phosphorus-Apatite
- Potassium-Biotite
- Boron-Turmaline
- Manganese-Olivine
- Calcium-Dolomite
Order to thermal conductivity
- Clay>sand>loam>peat
- Peat>sand>loam>clay
- Sand>Loam>peat>clay
- Sand>loam>clay>peat
- None of the above
Crumby soil structure is best for crop production and the soil structure found in forest soil is
- Crumby soil Structure
- Granular soil Structure
- Blocky soil Structure
- Platy soil Structure
- Prismatic soil Structure
Ec of saline soil is more than 4 ds/m. Then SAR value of saline soil is -
- Less than 15
- More than 15
- More than 13
- Less than 13
- None of the above
Example of highly salt tolerant crop -
- Mustard
- Rice
- Radish
- Bajra
- Jowar
Mineral most resistance to weathering
- Quartz
- Calcite
- Appetite
- Dolomite
- All of these
Central soil testing lab located at
- Delhi
- Karnal
- Bhopal
- Patna
- Lakhnow
Bulk density is determined by multiplying partical density by the volume of solids. Therefore, bulk density is generally ________ of partical density.
- 1/5
- 1/2
- 1/10
- 5/3
- 2/3
soil texture is basic property of soil it can't be changed so tell me the relative proportion of Sand, Silt and Clay in a soil is known as
- Soil Structure
- Soil Porosity
- Soil Profile
- Soil Separates
- Soil Texture
The term heavy and light refers to the degree of resistance offered by soil to the passage of impliments so tell me best soil for cotton cultivation
- Black Soil
- Laterite Soil
- Heavy Soil
- Light Soil
- Both a and c
Soil formation is very slow process. It is done by weathering. Skeleton soil is formed in which type of weathering.
- Chemical Weathering
- Physical Weathering
- Biological Weathering
- Weathering includes in decomposition
- Both C,D
Deposition of CaCO3 occur in B horizon . What is the Ratio of Liquid : gases: Solid in Normal soil ?
- 2:1:2
- 1:1:1
- 1:1:2
- 2:1:1
- 1:2:1
Red soil are dominant in tamilnadu so tell me black soil are found in
- Kerala
- Karnataka
- Madhyapradesh
- Tamilnadu
- None of these
Law of minimum was proposed by J V Liebig in which year
- 1845
- 1840
- 1825
- 1850
- 1830
O.M. Content of Indian Soil is low because of the high rate of decomposition under tropical and subtropical condition climate. Wood is decomposed by:
- Actinomycetes
- Bacteria
- Fungi
- Protozoa
- Algea
Partical density of menral soil is 2.66 gm /cc than partial density of organic soil is
- 2.1 gm/cm3
- 1.1 gm/cc
- 2.65 gm/cc
- 0.6 gm/cc
- 3. gm/cc
Soil density is measured by which instrument
- Pycnometer
- Tensiometer
- Pyrenometer
- Podzometer
- Thermameter
Maximum leaching takes place in which type of soil
- Black Soil
- Alluvial soil
- Clay Soil
- Laterite soil
- None of the above
Soil rich in fe and mn and colour of the soil is due to pesence of iron
- Red soil
- Black soil
- Laterite soil
- Desert soil
- Hilly soil
A vertical section of the soil through all its horizon and extending into the parent material is known as -
- Soil horizon
- Soil Phase
- Regolith
- Soil Profile
- Soil System
B horizon is also called as illuvial horizon. Which horizon is sub soil horizon?
- A horizone
- C horizone
- R horizone
- B horizone
- O horizone
Alluvial soil most recently developed soils with no diagnostic horizons. Alluvial soil are formed from which soil order?
- Vertisols
- Alfisols
- Mollisols
- Andisols
- Entisols
Black cotton soil are dominated by Vertisols soil order. Name of the soil order have self mulched soils ?
- Inceptisols
- Entisols
- Vertisols
- Mollisols
- Aridisols
The force that attract the same type of molecules
- Cohesion
- Adhesion
- Repulsion
- A and B Both
- None of the above
Father of soil science & pedology is known as V.V. Dokuchaev. The Book Nature & Properties of soil is written by -
- V.V. Dokuchaev
- Jethrotull
- J. V. Liebig 1840
- N.C. Brady
- Tisdale et al.
Granite is formed from Gneiss. Which is formed from sand stone?
- Marble
- Slate
- Quartz
- Feldspar
- Mica
The study of soil in relation to higher plants is called Edaphology. Science which deals with the study of the origin of rocks -
- Pedology
- Soil Science
- Edaphology
- Petrology
- Agrostology
The term soil Colloid is given by
- Sliceof
- Chiefer
- Grahm
- Hempner
- Funk
A few meters below the surface of the bhangar are beds of lime nodules known as.,..
- Deltaic alluvium
- Kankar
- Coastal alluvium
- Bhangar
- Regur
According to pedology, soil is a natural body but what is the basic unit of classification of soil
- Peds
- Pedon
- Clods
- Soil Series
- Both A & B
Which of the following type of soil meets rapid evaporation and percolation, low organic matter and poor store house of plant nutrients?
- Clay loam soil
- Black soil
- Laterite soil
- Red soil
- Muck soil
When the particles of the running water collide with each other resulting into further breakdown of the particle it is called as?
- Abrasion
- Shelter belt
- Watershed
- Attrition
- Erosion
Which is the dominant type of wind erosion that accounts for 50-75% of total particle movement with particle size 0.1-0.5 mm in diameter?
- Suspension
- Water Erosion
- Surface Creep
- Saltation
- None of the above
Which of the following soil property vary according to the climate, management, fertility and depends upon the location, fertility, physical conditions of the soil?
- Soil Texture
- Soil Productivity
- Soil Density
- Particle Density
- All of the these
Highly mobile nutrients move from the soil to plant roots by the process of ?
- Mass Flow
- Convective flow
- Diffusion
- Root interception
- None of these
The smallest 3D volume of a soil needed to give full representation of horizontal variability of soil is termed as?
- Podsol
- Gleys
- Pedon
- Solum
- Regolith
CEC Of kaolinite is 3-10 Cmol/kg .than CEC Of mica is -
- 0 Cmol/kg
- 3 Cmol/kg
- 33 Cmol/kg
- 13 Cmol/kg
- 23 Cmol/kg
Redox potential is oxide reduction potential of a system. The Eh of reduced soil is
- 400 to700 Eh
- -250 to 350 Eh
- -250 to -750 Eh
- -250 to -350 Eh
- None of the above
Which soil is the best agricultural soils in the world and are found in the grassland vegetation of subhumid and humid environment ?
- Inceptisols
- Mollisols
- Andisols
- Vertisols
- Entisols
The term catena (a Latin word means a chain) was Introduced by
- Milne 1935
- Schofield 1935
- Mulder 1909
- Richard 1950
- Liebig 1840