This Act is P.L. 89-321 (November 3, 1965) which was the first multi-year farm legislation, providing for 4-year commodity programmes for wheat, feed grains, and upland cotton. It was extended for 1 more year, through 1970, by enactment of P.L. 90-559. It authorised a Class I milk base plan for the 75 federal milk marketing orders and a long-term acreage diversion under a Cropland Adjustment Program. The law also continued payment and acreage diversion programmes for feed grains and cotton, and certificate and diversion programmes for wheat.