What is the average particle/ true density of soil?

Related Mcqs:

1. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:

   A. Mull
   B. Mulch
   C. Mycorrhizae
   D. Muck

   Submitted by: Shafiq Rehman

2. Soil additive which stabilizes the soil, improves resistance to erosion, increases to permeability to air & water, improves texture, eases cultivation or otherwise improves soil quality:

   A. Soil amendment
   B. Soil conditioner
   C. Both a & b
   D. None of the above

   Submitted by: Shafiq Rehman

3. The particlesw density of a mineral soil is about____________________?

   A. 2750 Kg m-3
   B. 2550 Kg m-3
   C. 2650 Kg m-3
   D. None of the above

4. _________refers to the increase in density of a soil as a result of applied load or pressure?

   A. Traffic soles
   B. Plough soles
   C. Compaction
   D. Pudding

   Submitted by: Shafiq Rehman

5. A soil is classified as sodic soil when______________________?

   A. EC is 8.5
   C. SAR is >13
   D. All the above

6. Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?

   A. Agregation of soil particles
   B. Cementing of soil particles
   C. Dispersion of soil particles
   D. All the above

7. The soil samples are dried at _______________, for gravimetric soil analysis?

   A. 110 ⁰C
   B. 120 ⁰C
   C. both A and B
   D. 105 ⁰C

   Submitted by: Shafiq Rehman

8. The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:

   A. Physical
   B. chemical
   C. Biological
   D. both A & B

   Submitted by: Shafiq Rehman

9. __________________ systems play a crucial role in increasing soil organic C storage and reducing net emissions of greenhouse gases in addition to soil erosion control:

   A. Engineering
   B. Agroforestry 
   C. Cultivating
   D. All of the above

   Submitted by: Shafiq Rehman

10. Any tillage and planting system that maintains at least 30% of the soil surface covered by residue after planting for the purpose of reducing soil erosion by water:

    A. Deep Tillage
    B. Conservation Tillage
    C. Both a & b
    D. None of these

    Submitted by: Shafiq Rehman