Several varieties such as Sonalika and Kalyan Sona, which were high yielding and disease resistant, were introduced all over the wheat-growing belt of India. During the period 1960 to 2000, wheat production increased from 11 million tonnes to 75 million tonnes while rice production went up from 35 million tonnes to 89.5 million tonnes. This was due to the development of semi-dwarf varieties of wheat and rice.

NCERT Biology Text, Class: XII, Unit VIII: Biology in Human Welfare, Chapter 9: Strategies for Enhancement in Food Production, page no: 173.