There are authorized to be appropriated for paying additional amounts for products pursuant to, and for carrying out the provisions of, this section, $1,000,000 for the fiscal year ending June 30, 1973, and $2,000,000 for each of the two succeeding fiscal years, $2,200,000 for the fiscal year ending June 30, 1976, $550,000 for the transition period of July 1, 1976, through September 30, 1976, and $2,420,000 for the fiscal year ending September 30, 1977.