Studies on synergistic interaction of different sources and levels of sulphur on growth of black soybean

A field experiment was conducted at agriculture field of Himalayan university, Jollang during kharif season of 2023 and 2024 to study the synergistic interaction of different sources and levels of sulphur on productivity of black soybean [ Glycine max (L.) Merr.]. The experiment was laid out in factorial randomized block design with nine treatments and three replications. Results revealed that use of treatment T 1 S 1 L 3 (Gypsum 45 kg S ha -1 ) recorded significantly higher plant height (15.43 cm, 35.43 cm, 65.56 cm) at 30 DAS, 60 DAS, 90 DAS, leave length (5.46 cm,7.49 cm, 9.47cm) at 30 DAS, 60 DAS, 90 DAS, number of leaves of plant (26, 36, 45) at 30 DAS, 60 DAS, 90 DAS, However, lowest plant height (13.96 cm, 33.96 cm, 64.03 cm) at 30 DAS, 60 DAS, 90 DAS, lowest leave length (4.13, 6.16, 8.13) at 30 DAS, 60 DAS, 90 DAS, lowest number of leaves (17, 23, 29) at 30 DAS, 60 DAS, 90 DAS was obtained in treatment T 4 S 2 L 1 (Iron Pyrite 15 kg S ha -1 ) . Inoculation of Gypsum 45 kg S ha -1 improved the quality of soybean in presence of chemical fertilizers. The use of treatment T 9 S 3 L 3 (Epsomite+ Sphalerite 45 kg S ha - 1 ) and treatment T 1 S 1 L 3 (Gypsum 45 kg S ha -1 ) gave at par results but statistically superior to T 4 S 2 L 2 (Iron Pyrite 15 kg S ha -1 ). Fresh weight at 30 DAS, 60 DAS, 90 DAS (6.51 g, 21.57 g, 32.11 g) and dry weight at 30 DAS, 60 DAS, 90 DAS (5.46 g, 20.20 g, 31.06 g) were recorded highest with T 1 S 1 L 3 (Gypsum 45 kg S ha -1 ).