_________is probably the most important growth limiting factor in acid soils especially those having pH below 5.0-5.5?

Related Mcqs:

1. Although some acid soils do exist in the northern mountainous regions of Pakistan (Mansehra, Sawat, Dir). Almost all cultivated soils of the country are ________________, with high base saturation and low organic matter content (generally less than 1%)?

   A. Alkaline
   B. Very much acidic
   C. Calcareous
   D. both A & C

   Submitted by: Shafiq Rehman

2. Soils that have more than 20% organic matter are termed as organic soils. These are also called:________?

   A. Peat soil
   B. solonchalk soil
   C. Muck soil
   D. Both a and c

   Submitted by: Shafiq Rehman

3. Organic Soils are classified as ____________ and are also known as ____________ soils:

   A. Alfisols. fine & coarse textured
   B. Histosols, peat & muck
   C. Ultisols, Fe & Al rich
   D. None of the above

   Submitted by: Shafiq Rehman

4. Organic matter decomposes rapidly in Pakistani soils because of ____________ conditions, that is why our soils generally have < 1% organic matter:

   A. High temperature
   B. Alkaline
   C. Both a & b
   D. None of a & b

   Submitted by: Shafiq Rehman

5. The forest soils have lower bulk density than agricultural soils because of their ______ content.

   A. High organic matter
   B. Low organic matter
   C. Both a & b
   D. None of these

   Submitted by: Adnan

6. Acid soils of the world’s arable comprise up to_____________________?

   A. 40%
   B. 30%
   C. 58%
   D. 20%

7. An intrazonal group of dark calcareous soils high in clay and having mainly montmorillonitic type clay are called as:________?

   A. Regur
   B. Ragour
   C. Montmorillosol
   D. Regosol

   Submitted by: Shafiq Rehman

8. Previously Essential nutrients required for the growth of plants were sixteen. In recent time the essential nutrients required for the growth of plants are:_________?

   A. 16
   B. 17
   C. 18
   D. None of the above

   Submitted by: Shafiq Rehman

9. Permanente wilting point of clayey soils is not less than____________________?

   A. 20%
   B. 10%
   C. 5%
   D. 15%

10. The soils most prone to structural crusts are those which are higher in_________?

    A. Clay content
    B. Sodium content
    C. Silt content
    D. Both A & B

    Submitted by: Shafiq Rehman