71. Fertiliser value of a nitrogeneous fertiliser is expressed in terms of its __________ content.
72. Phosphoric acid is produced in wet process from phosphate rock and
73. Reaction of __________ acid with phosphate rock produces superphosphates.
74. Which of the following does not come under the category of 'micro-nutrient' for plant growth?
75. pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.
76. Effectiveness of a fertiliser is independent of the
77. Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by
78. Two gas based fertiliser plants are located in
79. Which of the following does not come under the category of 'secondary nutrient' for plant growth?
80. Which of the following does not come under the category of'primary nutrient' for plant growth?
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