In the case of Zn deficiency of paddy, how much zinc sulphate should be applied in one hectare of soil.

In the case of Zn deficiency of paddy, around 25 kg of zinc sulphate should be applied in one hectare of soil or dip roots of rice seedlings in a 2 - 4% zinc sulphate suspension before planting to overcome the deficiency.
Zinc is an essential plant nutrient required for several biochemical processes in the rice plant, including chlorophyll production and membrane integrity.