Soil Science Oneliner for Competitive Exam

Soil Science Oneliner

Inherent capacity of soil to supply adequate nutrients for plant growth is called – Soil fertility

✅ Capacity of soil to produce in terms of yields is called – Soil Productivity.

✅ Soil fertility+ management includes in – Soil productivity

✅ Relative proportion of soil particles is called – Soil texture

✅ The arrangement of soil particles is called – Soil structure

✅ Size of Sand Particle – 0.2 to 0.02

✅ Size of Silt Particle – 0.02 to 0.002

✅ Size of Clay Particle – < 0.002

✅ Size of gravel – > 2mm

✅ Which structure is better for crop cultivation – Crumby

✅ Pore space is occupied by – water and rain.

✅ Total pore space is more in – clay soil (50-60%)

✅ Total pore space is low in – sand soil (30-40%)

✅ Weight of soil per unit volume is called – Bull density

✅ The Bulk density of common soil is – 1.5g/cm3

✅ Particle density is also known as – true density

✅ Weight of solid portion of soil per unit volume is called – Particle density

✅ The Particle density of common soil is – 2.6 g/cm3

✅ % pore space can be calculate by formula – (PD – BD) x 100/PD

✅ CO2 concentration in soil air is – over 0.3%

✅ CO2 concentration in soil air is ……..time higher than atmosphere – 10

✅ Well decomposed organic matter is called as – Humus

✅ Humus is also known as – Lingo protein

✅ Carbon: Nitrogen (C:N) ratio for organic matter – 12:1

✅ C:N ratio for FYM -100:1

✅ The soil moisture held by the soil against gravitation at energy status of -0.1 to 0.33 bar is called – Field Capacity

✅ The soil moisture held at energy status of – 0.33 bar to –15 bar (= 1569 g) is called – Available soil moisture

✅ Urea is a – Organic fertilizer

✅ CAN (calcium ammonium nitrate) is a – Neutral fertilizer

✅ Recommended ratio of NPK for cereal crops is – 4:2:1

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