61.
Glass electrode can be used for the estimation soil pH range of

62.
Preparation of FYM by Trench Method is given by

63.
Acid rocks have . . . . . . . . silica.

64.
Which biological organism having highest influence on soil aggregate formation?

65.
Which soil order have highest area in India

66.
For vermiculite, isomorphous substitution mainly occur at

68.
A sandy soil needs frequent irrigation because of

69.
Which one of the following will perform very poor as a source of N fertilizer under waterlogged rice field

70.
Readily available water in constant matric suction is more in

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