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451.

The pattern of occurrence of various soil taxonomic units on the detailed map is called:

A.	Soil complex	B.	Soil association
C.	Soil variant	D.	Soil phase

452.

The percentage of soil water held with water potential - 15 bars is called as:

A.	Hygroscopic coefficient	B.	Wilting point
C.	Field capacity	D.	None of the above

453.

The pH of a solution, containing 1 x 10-7 gm ion/ml. will be:

A.	6	B.	7
C.	8	D.	9

454.

The phosphate potential is denoted as:

A.	1/2 p Ca + pH2PO4	B.	PH - 1/2 p Ca
C.	RT in K+/?Ca++	D.	p Ca + pH2PO4

455.

The plant nutrient when supplied in excess prolongs the growing period and delay crop maturity is:

A.	Iron	B.	Phosphorus
C.	Nitrogen	D.	Potassium

456.

The porosity will be more in soils having particle size of:

A.	0.005 mm	B.	0.02 mm
C.	2.0 mm	D.	0.002 mm

457.

The positive and high value of redox potential indictes:

A.	Reducing conditions	B.	Strong oxidizing conditions
C.	Equally reducing and oxidizing conditions	D.	None of these

458.

The presence of autotrophic mycorrhiza enhances the uptake of nutrients in general, but particularly of:

A.	Iron	B.	Molybdenum
C.	Phosphrous	D.	Nitrogen

459.

The prime objective of conservation tillage is:

A.	Removal of plant residues	B.	Complete retention of plant residues
C.	Partial retention of plant residues	D.	None of these

460.

The principal cation that affects the availability/fixation of phosphorus in alkali soils is:

A.	Ca and Mg	B.	Na and K
C.	Fe and Al	D.	None of the above