In the case of wet land in the State which Is served by a Government source of irrigation specified in classes 1, II, and III of the Table below, an additional assessment at the rate of one hundred per cent and in the case of wet land in the State which is served by a Government source of irrigation specified in Class IV thereof, an additional assessment at the rate of fifty per cent, of the assessment payable for a fasli year for that land shall be levied and collected by the Government from the person liable to pay the assessment for each fasli year in respect of that land : Provided that the additional assessment together with the assessment payable per acre per fasli year for any wet land specified in column (1) of the Table below shall, in no case, be less than the minimum, or exceed the maximum, specified in the corresponding entry against that land (a) in column (2) of the Table ill the case of a single crop wet land, and (b) in column (3) of the Table in the case of a double crop wet land.