Relationship of filled grain percentage to yield [India]
1987
Rao, S.P. (Directorate of Rice Research Rajendranagar, Hyderabad (India))
Nonsynchronous flowering results in differential grain filling. Although panicles have good size and number of spikelets, low yields indicate the need for selecting for a higher percentage of fully filled grains. The filled grain patterns in panicles of short - (Rasi, Ratna, and IET8890), medium - (IET7573, IET7574, and IET 7575), and long-duration (IET5656, Mahsuri, and Pankaj) varieties. At harvest, the percentage of filled grains at 1.18 specific gravity was measured for each primary branch. Grain grade was high at the top and low at the bottom, irrespective of variety duration. Yields correlated positively with grain grade of the lowest branch of the panicle. Based on the percentage of filled grain on the lowest branch of the panicle, yield potential could be identified as poor (less than 10%), average (20-30%), moderate (30-40%), and high (50%).
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