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481.

The soil temperature under field conditions can be altered by suitable cultural practice such as:

A.	Irrigation	B.	Mulching
C.	Tillage	D.	All of the above

482.

The soils of ______ zones can supply adequate potassium for many years even under irrigations:

A.	Temperature	B.	Humid
C.	Arid	D.	Sub-tropical

483.

The species of Rhizobium present in the root nodules of soyabean is:

A.	R. japonicum	B.	R. leguminosarum
C.	R. trifolii	D.	R. phasedi

484.

The succulence and lodging in plants is due to 'excessive' application of:

A.	Zinc	B.	Phosphorus
C.	Hydrogen	D.	Potassium

485.

The sufficiency limit of iron is normally between:

A.	10-45 ppm	B.	50-150 ppm
C.	350-400 ppm	D.	500-750 ppm

486.

The systematic examination, description, classification and mapping of soil of an area is known as:

A.	Soil survey	B.	Soil mapping
C.	Soil classification	D.	All of the above

487.

The technique used for minimizing the loss of nitrogen in paddy fields comprises:

A.	Use of neem cake	B.	Use of pre-incubated urea
C.	Use of mud ball	D.	All of these

488.

The tendency of the young upper leaves to remain as the lower leaves yellow or die is an indication of nitrogen:

A.	Immobility	B.	Mobility
C.	Stability	D.	None of the above

489.

The texture of surface soil or surface horizon is called:

A.	Soil phase	B.	Soil type
C.	Soil variant	D.	None of them

490.

The tropical soils high in hydrous oxides of iron and aluminium embody ______ to torrential rains:

A.	Susceptibility	B.	Resistance
C.	Both of these	D.	None of these