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521.

What culture should be given priority in groundnut cultivation?

A.	Azospirilla	B.	Mycorrhiza
C.	Phosphobacteria	D.	Rhizobia

522.

What is the effect of application of P2O5 fertilizer to a green manure leguminous crop on the availabiliity of phosphorus to the succeeding crop?

A.	Greater amount of phosphorus is taken up and converted into organic form, which is released on decomposition of green matter	B.	Green manure increases the availability in organic form to the next crop
C.	It does not affect the availability of phosphorous to succeeding crop	D.	It fixes the P2O5 through humus and reduces the availability

523.

What is the P2O5 content of various rock phosphates?

A.	20 - 35%	B.	35%
C.	11 - 20%	D.	18 - 20%

524.

When a nutrient takes active part in growth and development of plant called:

A.	Beneficial	B.	Essential
C.	Required	D.	None of above

525.

When a plant is under soil moisture stress, the roots:

A.	Shrink in size	B.	Expand in size
C.	Remain unaffected	D.	Both (a) and (b)

526.

When emerging leaves of maize show yellow to white bleached bands in lower parts, it whows the defidency of:

A.	Zinc	B.	Iron
C.	Copper	D.	Boron

527.

When organic matter with wide C:N (70:1) is added to the soil, the net effect is the disappearance of mineral nitrogen due to:

A.	Mineralization	B.	Immobilization
C.	N2 transformation	D.	N2 reduction

528.

Which nitrogenous fertilizer will you recommend for paddy crop?

A.	Nitrate fertilizer	B.	Amide fertilizer
C.	Ammonical nitrate fertilizer	D.	All the above

529.

Which nutrient is maximum given for raising the field crops?

A.	Nitrogen	B.	Potash
C.	Phosphorus	D.	Calcium

530.

Which of the biochemically weathered constitutes soil?

A.	Upper	B.	Middle protion
C.	Lower portion	D.	Portion adjacent to bedrock