41.
Which of the following pairs is correctly matched?

42.
Father of Soil Testing is

43.
Concentration of which element is highest in soil

44.
Which element(s) is/are mobile with plant system?

45.
The N in all fertilisers comes from

46.
Soil fertility and fertilizers' was written by

47.
Which form of nitrogenlous fertiliser will be preferred for paddy and potato?

48.
Which earth worm species is most efficient for Vermiculture?

49.
Which of the following fertiliser is not produced in India?

50.
Relation of De (diffusion coefficient) with moisture content (θ)

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