Abstract
The genetic gains and productivity trends were estimated for rice varieties developed by Indira Gandhi Krishi Vishwavidyalaya (IGKV), Raipur, India from 1905 to 2021 to assess the improvement in rice breeding programme. During this period (categorized into three different phases – 1, 2 and 3), 90 rice varieties were developed. Twenty-four varieties that became popular in different phases (Seven popular landraces from Phase 1, six varieties from Phase 2 and 11 varieties from Phase 3) were selected and evaluated for yield over five consecutive years (2017 to 2021) under replicated trials. The study revealed highest genetic gain of 1.50% for yield in the varieties that were released in Phase 2 with a yield enhancement of about 51 kg ha-1 year-1, followed by a genetic gain of 1.03% (43 kg ha-1 year-1) during Phase 3 and least genetic gain of 0.159% (4 kg ha-1 year-1) in Phase 1. This increase seems to be a result of planned and strategic research in crop improvement coupled with improved agronomic practices.
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