Productivity and Profitability of Rainfed Relay Linseed as Influenced by Residual Effects of Organic Nutrient Management in Aromatic Rice Varieties

Author: Anjan K. Sarmah, J.K. Choudhary, J. Deka, K. Pathak, K.N. Das and P. Kalita

Download PDF

Abstract

A field experiment was carried out at organic block of Instructional-cum-Research Farm of Assam Agricultural University, Jorhat, Assam, India during rabi (November -March) season of 2019 and 2020 to study the residual effects of organic nutrient management in aromatic rice varieties on relay sown linseed in rainfed condition. Most of the rice fallow areas in Assam, India are kept fallow due to lack of suitable crops adapted to moisture deficit condition after the harvest of the long duration kharif rice crop. The study was carried out to study the performance of linseed as a relay crop after the long duration kharif rice under residual fertility and moisture condition. The experiment was laid out in factorial randomized block design (RBD) and replicated thrice. The experiment consisted of three aromatic rice varieties and five organic nutrient management practices applied in the rice crop. The linseed crop received no external input and grown with residual fertility and moisture. Among the organic nutrient management practices, application of vermicompost @ 30 kg N ha-1 with in situ green manuring with Sesbania aculeata and seedling root dip treatment with Azospirillium and phosphorus solubilizing bacteria (PSB) @ 3.5 kg ha-1 each in preceding aromatic rice varieties produced significantly higher values of plant population, plant height at harvest, number of branches plant-1, root and shoot dry weight, capsule plant-1, seeds plant-1, seed yield ( 394.52 kg ha-1 and 416.97 kg ha-1), stover yield (890.09 kg ha-1 and 896.63 kg ha-1) and oil yield (135.16 kg ha-1 and 144.56 kg ha-1) uptake of N, P and K and profitability of linseed during both the years. The residual effects of aromatic rice varieties on linseed were not found significant. The study revealed that linseed could be a good choice as a relay crop in rice based cropping system in rainfed organic ecosystem.

Keywords

Aromatic rice, Productivity, profitability, organic nutrient management, relay linseed, residual effect

Conclusion

It may be concluded that application of 30 kg N ha-1 through vermicompost along with green manuring with Sesbania aculeata and seedling root dip treatment of rice with Azospirillum and PSB @ 3.5 kg ha-1 each (N3) in preceding rice was found to be most effective with regard to residual effect on growth, yield, nutrient uptake and profitability of succeeding relayed linseed in aromatic rice-linseed sequence in rainfed condition. Linseed could be a promising relay crop in rice based cropping systems under organic management in medium land rainfed situation in Assam, India. The study may be further be conducted in low land rice fallow areas to investigate the potential of linseed in lowland situation.

References

-

How to cite this article

Anjan K. Sarmah, J.K. Choudhary, J. Deka, K. Pathak, K.N. Das and P. Kalita (2023). Productivity and Profitability of Rainfed Relay Linseed as Influenced by Residual Effects of Organic Nutrient Management in Aromatic Rice Varieties. Biological Forum – An International Journal, 15(5): 558-562.