71. Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is
72. Total no. of electron consumed per unit N2 fixation during BNF is
73. Soft and unconsolidated calcium carbonate, usually mixed with varying amounts of clay or other impurities is described as
74. Mollisols are rich in which nutrient?
75. The water holding capacity (WHC) of humus on a mass basis is . . . . . . . . times that of the silicate clays
76. The total nutrients in 100 kg of 17-17-17 are
77. Chlorite are basically silicates of
78. Which one is most resistant to decomposition by microbes in soil?
79. The nutrient with a key role in biological N-fixation is
80. Which of the following the first phase of water erosion?
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