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461.

The process of ammonification is often ______ by the use of pesticides:

A.	Harmed	B.	Benefited
C.	Not affected	D.	None of these

462.

The process responsible for the formation of sodic soil is:

A.	Salinization	B.	Alkalinization
C.	Podzalization	D.	Calcification

463.

Which of the following rotations is likely to leave soil richer in organic matter:

A.	Continuous sorghum	B.	Continuous maize
C.	Continuous Oats	D.	Maize-oats-clovers

464.

Zinc sulphate is generally taking more production under:

A.	Saline soil	B.	Acid soil
C.	Water logged soils	D.	Alkali soils

465.

The quantity of solid phase phosphorus that acts as reserve is often referred to as:

A.	Intensity factor	B.	Quality factor
C.	Quantity factor	D.	None of these

466.

The quantity of urea needed for applying 115 kg nitrogen to maize will be (approx):

A.	100 kg	B.	250 kg
C.	100 kg	D.	150 kg

467.

The ratio of thermal conductivity and heat capacity is known as:

A.	Thermal diffusivity	B.	Heat capacity
C.	Thermal capacity	D.	None of these

468.

The relative amounts of air and water in the pore spaces:

A.	Always remain constant	B.	Fluctuate continuously
C.	Half filled and half empty	D.	All of the above

469.

The relative proportions of sand silt and clay n the soil is known as:

A.	Soil structure	B.	Soil consistence
C.	Soil texture	D.	None of the above

470.

The representtion of surface feature on map and their identification is called:

A.	Soil legand	B.	Soil map
C.	Soil variant	D.	None of them