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Mega quiz -04

  Soil science


✔️ 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 - 1.6g/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 

✅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 saw dust 400:1 

✅ C:N ratio for Legume – 20- 30:1 

✅C:N ratio for FYM -10:1 

✅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  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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