81.
Tourmaline is the best source of

82.
Which of the following nutrient elements is not a micronutrient?

83.
The neutralising values of the following liming materials are such that

84.
The term catena (a Latin word means a chain) was introduced by

85.
Nutrient Use Efficiency of Micro Nutrients is

86.
Gapon's equation is widely-used equation to describe

87.
Layer spacing of Halloysite

88.
Important criteria for classifying soil at the family & sub order levels is

89.
Ballast elements are

90.
Unsaturated hydraulic conductivity is maximum in

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