61. Mitscherlich factor for phosphorus is
62. When organic matter is > 1.5% in soil, rated as
63. Who proposed the criteria of essentiality of plant nutrients?
64. Thermal conductivity is highest in
65. Which rock having specific gravity lower than water & sponge like?
66. After submergence how Specific Conductance of a soil changes
67. Rock phosphate is a suitable fertiliser for soils which are
68. Which crop can deplete maximum micro-nutrients from soil?
69. pH of cell sap is maintained by
70. Which one is dominating salt in alkali soil
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