51.
The solum is comprised of

52.
A-horizon of the soil is also known as

53.
Lignin theory is given by

54.
Puddling is possible when clay % is

55.
The maximum concentration limit of urea for spraying is

56.
The density measured by

57.
Which one of the following is not a Mn mineral

58.
The toxicity of zinc in soil is reduced by adding

59.
Unit of measurement of cloud cover

60.
Rhizobia penetrate the root through

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