81. Which one of the following is an example of natural chelate
82. Calcium and magnesium can be deficient in
83. In which country most of the N required for crop production through N2 fixation by legumes
84. The cation exchange capacity of a mineral soil containing pre-dominately kaolinitic clay minerals generally ranges between
85. Most efficient method of fertility evaluation is
86. Which one of the following formula is used for calculation of base saturation
87. Principle factors governing K fixation in clay lattice are
88. Gypsum Requirement of gypsum is
89. The B horizon is generally absent in
90. A soil, which has pH more than 8.5 and ESP more than 15 and EC is greater than 4 m mhos/cm, the soil is called
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