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501.

To check nitrification, nitrification inhibitors are most useful in:

A.	Peady	B.	Cotton
C.	Maize	D.	None of these

502.

To prevent denitrification losses of nitrogen in paddy field, nitrogen should be applied in the:

A.	Reduced zone	B.	Oxidized zone
C.	Hydronized zone	D.	Calcified zone

503.

Tolerance to soil salinity of the given set of crops is such that:

A.	Barley > wheat > upland paddy > beans	B.	Barley > wheat > beans > upland paddy
C.	Wheat > Barley > beans > upland paddy	D.	Wheat > Barley > upland paddy > beans

504.

Which of the following organism is responsible for decomposition of organic matter?

A.	Quartz	B.	Feldspar
C.	Mica	D.	All of these

505.

Transport of P2O5 from the cytosol (pH about 7) into vacuoles (pH nearly 5.5) involves:

A.	H2PO4 alone	B.	H2PO4 alone
C.	PO4 alone	D.	H2PO4 and HPO4

506.

Tricalcium phosphate is soluble in:

A.	Water	B.	Weak acid
C.	Strong mineral acid	D.	None of the above

507.

Type of water vapour movement, which occurs in soils, is:

A.	Internal	B.	External
C.	Both of these	D.	None of these

508.

Under tropical condition, the volatilization losses of nitrogen is:

A.	20 - 50%	B.	10 - 20%
C.	40 - 80%	D.	None of these

509.

Unit of measuring electrical conductivity is:

A.	Micro-gram/sq.com	B.	Angstran/cm
C.	Millimhos/cm	D.	None of these

510.

Upper plastic limit is also known as:

A.	Liquid limit	B.	Lower limit
C.	Index of plasticity	D.	None of these