SHEKHARGOUDA, MI A, VEERANAGOUDAR2019-10-152019-10-151999No . of references 132http://krishikosh.egranth.ac.in/handle/1/5810131288The field experiment with four planting ratios (female to male) viz., 2:1, 3:1, 2:2 and 4:2 and three nitrogen levels viz., 100,125 and 150 kg per hectare revealed that the planting ratio did not significantly influence the plant height, leaf number and leaf area of the parental lines of DSH-3 sorghum hybrid, where as, higher doses of nitrogen increased the plant height, number of leaves and leaf area. The significant reduction in 50 percent flowering with 150 kg N per ha was observed in both the parental lines. Higher hybrid seed yield was obtained with 2:1 planting ratio compared to other planting ratios mainly due to increased ear length (23.7 cm), ear width (4.0 cm), ear weight (33.2g ), number of seeds per ear (374), threshing percentage (34.2), seed set(44.5%) and 1000 seed weight (11.48 g). Increase in the nitrogen level from 100 to 150 kg N per ha increased hybrid seed yield from 573.1 kg to 800 kg per ha and it is due to increased values for ear length (22.6 to 23.3 cm), ear width (3.4 to 3.9 cm ), ear weight (30.0 to 32.1g), number of seeds per ear (282.2 to 327.0 ), threshing percentage (27.9 to 32.0), seed set (32.7 to 40.6%), and 1000 seed weight (29.30 to 31.8 g ). The planting ratios did not significantly influence the germination, shoot length, root length and vigour index. While, the germination percentage increased by 3 percent with the application of 150 kg N per ha. The other seed quality attributes like shoot and root length, seedling dry weight and vigour index increased significantly due to additional doses of nitrogen application. The interaction effects due to planting ratios and nitrogen levels were non-significant for all the characters.ennullThesis