Effect of Seed Priming and Weed Management Techniques on System Productivity and Economics of Dry Direct Seeded Rice-Blackgram Sequence

Author: M. Veerendra, K. Srinivasulu, B. Sreedevi, S. Ratna Kumari and V. Srinivasa Rao

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Abstract

Investigating the influence of treatments imposed during a particular season on entire cropping sequence in terms of system productivity and economics can help to understand the treatment effect more comprehensively. A field experiment was conducted at Agricultural College, Bapatla to find out the effect of seed priming and weed management techniques imposed during kharif in rice on system productivity and economics of rice-blackgram sequence during kharif and rabi seasons of 2021-22 and 2022-23. The experiment was laid out in a split plot design with seed priming treatments as main plots and weed management practices as subplots. No significant difference was observed among the seed priming treatments. However numerically higher system productivity and economics was realized in hormonal priming with gibberellic acid @ 150 ppm. During both the years, highest total rice equivalent yield (rice yield + rice equivalent yield) was recorded with hand weeding thrice at 20, 40 and 60 DAS followed by pretilachlor + safener @ 750 g a.i ha-1 with in 3 DAS as PE fb bis-pyribac sodium @ 25 g a.i ha-1 at 20-25 DAS fb fenoxaprop-p-ethyl + safener @ 69 g a.i ha-1+ ethoxy sulfuron @ 18.75 g a.i ha-1 (tank mix) at 40-45 DAS as PoE. Highest gross returns were obtained with hand weeding thrice at 20, 40 and 60 DAS. Whereas higher net returns and B:C ratio were obtained with pretilachlor + safener @ 750 g a.i ha-1 with in 3 DAS as PE fb bis-pyribac sodium @ 25 g a.i ha-1 at 20-25 DAS fb fenoxaprop-p-ethyl + safener @ 69 g a.i ha-1+ ethoxy sulfuron @ 18.75 g a.i ha-1 (tank mix) at 40-45 DAS as PoE. Negative net returns and b:c ratio were obtained with weedy check. No interaction was found between seed priming treatments and weed management practices.

Keywords

Economics, rice-blackgram cropping sequence, seed priming, system productivity, weed management

Conclusion

Numerically, higher benefits were obtained with hormonal priming compared to all the other methods. Higher system productivity and gross returns were obtained with hand weeding thrice at 20, 40 and 60 DAS followed by sequential application of herbicides. However, considering the net returns and b: c ratio, pretilachlor + safener @ 750 g a.i ha-1 with in 3 DAS as PE fb bis-pyribac sodium @ 25 g a.i ha-1 at 20-25 DAS fb fenoxaprop-p-ethyl + safener @ 69 g a.i ha-1+ ethoxy sulfuron @ 18.75 g a.i ha-1 (tank mix) at 40-45 DAS as PoE is economically feasible option over hand weeding. Thus, sequential application of herbicides in dry direct seeded rice can yield higher benefits to the farmers.

References

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How to cite this article

M. Veerendra, K. Srinivasulu, B. Sreedevi, S. Ratna Kumari and V. Srinivasa Rao (2023). Effect of Seed Priming and Weed Management Techniques on System Productivity and Economics of Dry Direct Seeded Rice-Blackgram Sequence. Biological Forum – An International Journal, 15(9): 557-562.