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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