Department of Agronomy, College of Agriculture, University of Agricultural Sciences, Hebbal, Bangalore-560024
*Present Addresses: Scientist, Central Institute of Medicinal and Aromatic Plants, Regional Centre, Kodaikanal-624103
** Director of Research, University of Agricultural Science, GKVK, Bangalore-560065.
Four genotypes of Sorghum (2077-B Early, 2077-B, CS-3541 and CS-3541) were sown throughout the year (January, 1978 through December, 1979) on red sandy loam soils of Bangalore, under irrigated condition to study the flowering behaviour. During the reproductive phase i.e., from panicle initiation (PI) to flowering, different stages in panicle development were observed and named as branch initiation phase. spikelet differentiation phase and inflorescence elongation phase. Days taken to 50 percent flowering decreased with the advancement in sowing date from January to August and then increased with further delay. Changes in days to flowering were found mainly due to panicle initiation and also to some extend due to panicle development. Correlation studies revealed a negative relationship of fphasic development with minimum temperature and positive relationship of phasic development with sunshine hours per day.
