Ratoon productivity of sorghum breeding lines (Sorghum bicolor (L.) Moench)

Ratooning sorghum (Sorghum bicolor (L.) Moench) becomes alternative cultivation that can be developed in Indonesia. The objective of this study was to obtain information about ratoon productivity from sorghum breeding lines. The research was conducted during Mei until July 2018 at Cikeumeuh Experimental Field, The Indonesian Center for Biotechnology and Agriculture Plant Genetic Resources (BB Biogen), Bogor. The experiment was arranged using a randomized complete block design with three replications and using 13 sorghum lines produced by Numbu x UPCA S1 and 2 commercial varieties. The result showed the character of agronomy and yield potential of sorghum lines showed different diversity between comparative varieties. Characters of the number of shoots (61.47%), plant height (89.28%), the number of leaves (86.41%), stem diameter (90.7%), panicle length (98.5%), panicle weight (59.51%) and 1000 grains weight (88,63%) have a high estimated heritability. Characters that have high an estimated genotypic coefficient of variation (GCV) are the number of shoots (12.98%), number of leaves (11.69%), stem diameter (10.37%), panicle length (14.66%) and panicle weight (10.34%). The results of the correlation analysis showed that stem diameter and days of 50% flowering had a significant correlation and high positive direct effect with panicle weight.