31.
Example of neutral igneous rock is

32.
Term 'Bioavailable' was coined by

33.
A clay soil must contain at least . . . . . . . . Clay separate, to be designated a clay

34.
The major nutrients are

35.
Plasticity of soil can be determined by using

36.
Consider the following statements. Cation exchange of soil colloidal clay is due to
1. Silicon tetrahedral layer
2. Isomorphous substitution
3. Hydration of clays
4. Broken edges of clay lattices
The correct sequence is

37.
Hill soils are generally

38.
Ammonium nitrate contains

39.
Rhizobium of alfalfa group is

40.
Cereal straw is a particularly rich source of

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