Rafique, Nawab TayabMaurya, Manish Kumar2024-06-282024-06-282023https://krishikosh.egranth.ac.in/handle/1/5810211169A field experiment entitled “Conservation agriculture practices in rice-linseed cropping sequence” was conducted at Instructional cum Research (ICR) farm, AAU, Jorhat during kharif, 2022 and rabi season, 2022-2023. The experiment consisted of three objective viz. (i) to study the effect of rice establishment methods on growth and productivity of rice and on succeeding linseed crop, (ii) to examine the effect of kharif rice stubble managements on performance of linseed crop and (iii) to assess the economics of the rice based double cropping system as influenced by rice establishment methods and stubble management practices. The experiment consisted of three rice establishment methods viz. transplanting (M1), wet-DSR (M2) and dry-DSR (M3) in main-plot and four stubble management practices viz. no residue (S1), 15 cm tall stubble chopped (S2), 15 cm tall stubble unchopped (S3) and 30 cm tall stubble chopped (S4) in sub-plot. The experiment was laid out in split-plot design with three replications. The soil at experimental site was sandy loam in texture with a pH of 5.1 and 5.26, medium in availability of nutrients including N (282.4 and 279.09 kg ha-1), P2O5 (23.86 and 24.79 kg ha-1), K2O (128.4 and 126.5 kg ha-1) and organic carbon content (0.51 and 0.53%) in Kharif and rabi season, respectively. The total rainfall received during kharif and rabi season was 1267.9 and 278.5 mm, respectively. The mean maximum and minimum temperature during kharif season ranged from 28.2 to 34.90C and 10.9 to 25.60C, respectively while during rabi season, they ranged from 21.4 to 31.90C and 7.9 to 20.50C, respectively. Different growth and yield attributing characters, as well as the yield of rice, were significantly influenced by rice establishment methods. All the growth and yield attributing characters were significantly higher in transplanting (M1) over wet-DSR and dry-DSR. The highest grain yield (5.17 t ha-1) and straw yield (7.04 t ha-1) were also recorded with transplanting (M1). Similarly, different growth and yield attributing characters, as well as the seed yield of linseed were significantly influenced by rice establishment methods and stubble management practices. All the growth and yield attributing characters were significantly higher where linseed was grown following the dry-direct-seeded rice (M3). The highest seed yield (5.28 q ha-1) and stover yield (11.29 q ha-1) were also recorded where linseed was grown following the dry-direct-seeded rice (M3). Similarly, among the stubble management practices, growth and yield attributes were significantly higher where linseed was grown following 30 cm tall rice stubble chopped (S4). The highest seed yield (5.72 q ha-1) and stover yield (11.53 q ha-1) were also recorded where linseed was grown following 30 cm tall rice stubble chopped (S4). The highest cost of cultivation (₹ ha-1 76169.46) in the rice-linseed cropping system was incurred where linseed was grown after transplanted rice with 30 cm tall stubble chopped (M1S4). The highest gross return (₹ ha-1 137376.7) and net return (₹ ha-1 61207.21) were obtained by the treatment combination of linseed grown after transplanted rice with 30 cm tall stubble chopped (M1S4). However, the maximum benefit-cost ratio was recorded where linseed succeeded wet-direct-seeded rice with 30 cm tall rice stubble unchopped (2.02:1) followed by linseed grown after wet-direct-seeded rice with 30 cm tall stubble chopped (1.95:1). From the point of view of the rice-linseed cropping system, the best combination in terms of rice equivalent yield (6668.77 kg ha-1) was obtained by linseed following transplanted rice with 30 cm rice stubble chopped (M1S4).EnglishThesis