D:-0.10 mm to 0.50 mm
Correct Answer:- Option-D
Question29:- form of sulfur is predominant in humid region surface soil.
A:-Mineral
B:-Inorganic
C:-Organic
D:-All the above
Correct Answer:- Option-C
Question30:-Reclamation of sodic soils is usually done by
A:-Gypsum application
B:-Leaching with water
C:-Sulfur application
D:-Gypsum application and leaching with water
Correct Answer:- Option-D
Question31:-An index which is widely used to represent quantum of aggregates
A:->1.0 mm
B:-1.0 mm
C:-0.5 mm
D:->0.25 mm
Correct Answer:- Option-D
Question32:-"SO_4*{2-}* adsorption is restricted to
A:-Acidic soils
B:-Alkaline soils
:-Neutral soils
D:-Neutral to alkaline soils
Correct Answer:- Option-A
Question33:-Azotobacter chroococcum is found in
A:-Near neutral soil condition
B:-Alkaline soil condition
:-Acidic soil condition
D:-Near neutral and slightly alkaline condition
Correct Answer:- Option-D
Question34:-The deficiency range of hot water extractable boron is
A:-<0.5 mg/kg
-<1.0 mg/kg
C:-<0.1 mg/kg
D:-<2.0 mg/kg
Correct Answer:- Option-A
Question35:-Safe limit of nitrate in drinking water is

D:-5 mg/L
Correct Answer:- Option-A
Question36:- is a nitrification inhibitor.
A:-Isibutylidene diurea
B:-Neem cake
C:-Urea form

D:-All the above
Correct Answer:- Option-B
Question37:-The first objective of watershed management is
A:-Enhancement of agricultural productivity
-Improvement of water yields
C:-Conservation of natural resources
D:-Rehabilitation of natural resources
Correct Answer:- Option-D
Question38:- are an important part of "Ela" system.
A:-Arable lands
B:-Non arable lands