1Central Institute of Medicinal and Aromatic plants, Regional Centre, Anand Ashram, Fairy Falls Road, Kodaikanal-624103
Department of Agronomy, University of Agricultural Sciences, Hebbal, Bangalore-560065
Four genotypes of Sorghum (2077-B Early, 2077-B, CS-3541 and CS-3541 late) were sown round the year (January, 1978 through December, 1979) to study their vegetative and reproductive phases and in turn the possible influence of these phases on yield. The panicle development from initiation (PI) to 50% flowering was divided into three phases for convenience viz., branch initiation phase, spikelet differentiation phase and inflorescence elongation phase. The grain yield was significantly higher in January, February, March and December sowings, followed by June to August sowings and September to November sowings. Vegetative phase was noted to exert a positive influence on yield, though not the major factor in determining yield. This study suggested that the final yield depends upon an interaction of spikelet development period, rate of spikelet initiation, dry matter production and temperature.
