A. Sub-humid climate

B. Arid and semi-arid climate

C. Temperate climate 

D. None of these

A. Organic matter

B. Weathering of apatite minerals

C. Fertilizers

D. Mica

A. High 

B. Medium

C. Low  

D. Extremely low

A. Running water             

B. Wind

C. Sea      

D. Ice

A. Ammonium sulfate

B. Urea

C. DAP

D. Ammonium nitrate 

A. Field capacity to super available water 

B. Only field capacity 

C. Field capacity minus wilting point

D. None of these

A. Nitrification

B. Denitrification

C. Leaching

D. Volatilization

A. Carbon 

B. Oxygen

C. Magnesium 

D. Hydrogen

A. Pedologist

B. Soil chemist 

C. Edaphologiest

D. Agronomist  

A. Nitrogen 

B. Phosphorous 

C. Potassium 

D. None of these