Assessment for potential grain filling patterns in eight early duration rice cultures

The potential grain filling (net product comprising spikelet numbers and weight, kernal filling to its potential capacity) pattern was examined in the panicles of 7 pre-released and one traditional early duration rice (Oryza sativa L.) cultures. Better high density grain index was found among primary/mother tillers in comparison to tertiary/quarternary tillers in most of the cultures, IET-7564 and Rasi had higher index of 79.9 and 79.4%, respectively in primary/mother tillers while in tertiary/quarternary tillers IET-8344 and Rasi had high density grain. Potential yield calculations revealed that there would be a possibility of yield improvement through better grain filling.