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71.

Available nitrogen of less than 280 kg/hectare is considered:

A.	Low	B.	Medium
C.	High	D.	Trace

72.

Available phosphorous of less than 10 kg/ha of soil is considered as:

A.	Low	B.	Medium
C.	High	D.	Trace

73.

Available phosphorous of more than 25 kg/ha of soil is considered as:

A.	Low	B.	Medium
C.	High	D.	Trace

74.

Available potassium of more than 280 kg/ha in soil is considered:

A.	Low	B.	Medium
C.	High	D.	Trace

75.

Available Zn in the soil, can be determined by using the solution of:

A.	1 N NH4 OAC	B.	DTPA + CaCl2 (pH 7.3)
C.	EDTA + (NH4)2 CO7	D.	All of these

76.

Who is the Father of the soil testing?

A.	S. Larsen	B.	M.L.Jackson
C.	M.L. Troug	D.	None of the above

77.

Azolla can fix _____ kg N2/ha/year.

A.	80-100	B.	30-40
C.	10?15	D.	100-120

78.

Azotobacter and Rhzobium bacteria are:

A.	Antibiotic producers	B.	Nitrogen fixers
C.	Plant pathogens	D.	Animal Pathogens

79.

Azotobacter sp. Fix atmospheric nitrogen:

A.	As symbiounts on sugarcane	B.	As symbiounts on rice
C.	As symbiounts on legumes	D.	In free soil

80.

Barley, rape and cotton are _____ salt tolerant:

A.	High	B.	Low
C.	Medium	D.	None of these