For the cane delivered by a grower to a mill in each year, the grower's home mill shall pay the grower a price per ton based on the recoverable value of the cane, not less than the price determined in accordance with the provisions of this Chapter: Provided that, if a grower delivers cane to a mill in the month of March in any year, the South African Sugar Association may, on the application of the Mill Group Board concerned, declare that such cane shall, for the purposes of this Chapter, be deemed to be delivered in the following year.