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61.

Anaerobic environment of paddy soil is responsible for gaseous loss of fertilizer nitrogen by:

A.	Ammonification	B.	Nitrification
C.	Denitrification	D.	Volatilization

62.

Anion exchange capacity is found maximum in the case of:

A.	Kaolinite	B.	Montmorillonite
C.	Illite	D.	None of these

63.

Apatite is a group of minerals which mainly contains:

A.	Sulphur	B.	P2O5
C.	N2	D.	Titanium

64.

Application of nitrogen in pulses at the time of planting is known as:

A.	Additional dose	B.	Starter dose
C.	Synergistic dose	D.	Basic dose

65.

Aridisols soils re found in the region of:

A.	Humid	B.	Arid
C.	Submerged	D.	None of these

66.

Arrangement of soil particles is referred to as:

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

67.

As plants grow to maturity, the concentration of plant nutrients changes. What kind of change occurs in respect of N, P, K, Ca and Mg?

A.	Concentration of all 5 elements decreases	B.	N and P decrease K, Ca and Mg increase
C.	N, P and K decrease K, Ca and Mg increase	D.	N, P and K increase, Ca and Mg decrease

68.

Aspergillus niger test is used for:

A.	Cu & Mg	B.	Cu & Zn
C.	Mg & Zn	D.	N & S

69.

At 1 x 10-9 H+ concentration, what will be the pH value?

A.	5	B.	10
C.	9	D.	6

70.

Available form of phosphorus ions is:

A.	Phosphoric	B.	Phosphorous chloride
C.	Phosphorous	D.	Photphorous nitrate