61. Most accurate instrument used to measure atmospheric pressure is . . . . . . . . barometer.
62. Y-index value for illitic type clay is
63. The soil is well flocculated if it has more of
64. Which country have monopoly in P deposits?
65. Fertilisers SSP dissolve in soil to furnish phosphate, calcium and
66. Critical limit of available phosphorus in soil for wheat crop by Olsen's method is
67. Alluvial fan is seen in India?
68. Calcium cynamide contains nitrogen (%)
69. The major source of negative charge on humus colloids is due to
70. Which is the main constitution of Biogas?
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