Physiological variation in grain yield of rabi sorghum genotypes under shallow soils

A field experiment was conducted in shallow soils at Regional Agricultural Research Station, Bijapur, University of Agricultural Sciences, Dharwad (Karnataka) during rabi season of 2006–07. Among the genotypes RSLG 1119, RSLG 871, RSV 423 and Maulee have given higher yields compared to other genotypes. The factors that favoured the higher yields were leaf area index, chlorophyll content, relative water content and panicle dry weight. The production of dry matter alone did not help in realizing the higher yield. In case of higher yielder, there was an efficient dry matter production as well as translocation from source to sink. Less number of factors in moderate and only few factors have favoured the low yielders. It was observed that the differential performance of genotypes was due to difference in dry matter partitioning efficiency.