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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