In which landmark year were Mexican semi-dwarf wheat varieties (Sonora 64 and Lerma Rojo) first introduced to India on an extensive trial scale?

In 1963, following Dr. Borlaug's visit upon invitation by Dr. M.S. Swaminathan, 100 kg seeds of each of four Mexican dwarf wheat varieties (including Sonora 64 and Lerma Rojo) were imported and tested across Indian research stations.