Effect of different Levels of Nitrogen and Growth Retardant on Yield and Lodging Percent in Transplanted Rice (Oryza sativa L.)

Author: Priyanka J., Ramesha Y.M., Krishnamurthy D., Siddaram and Chandra Naik M.

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Abstract

Lodging of rice reduces production and may be related to the agronomic practices, regard to this an experiment was conducted during kharif - 2021 at Agricultural Research Station, Dhadesugur to study the effect of different levels of nitrogen and growth retardant on yield and lodging per cent of rice. The experiment was laid out in Randomized Complete Block Design with eleven treatments and replicated thrice. The results revealed that, application of 150% RDN (225 N kg ha-1) + Mepiquat chloride with two spray resulted in higher yield parameters viz., more number of tillers per hill (26.3), productive tillers (22 hill-1), filled grains per panicles (246.6), panicle weight (4.5 g) and highest test weight (21.2 g) which in turn resulted in higher grain (6215 kg ha-1) and straw yield (7181 kg ha-1). Application of nitrogen in combination with mepiquat chloride spray also resulted in higher uptake of NPK (135.83, 42.56 and 121.18 kg ha-1 respectively). Among the different treatments, application of 150% RDN (225 N kg ha-1) + Mepiquat chloride with two spray recorded smaller plant height (84 cm) and lower lodging per cent (2 %) than other treatments which intern recorded higher gross returns (Rs. 124162 ha-1), net returns (Rs. 73642 ha-1) and B:C ratio (2.46 ).

Keywords

RDN - Recommended dose of Nitrogen, Mepiquat chloride, plant height, yield and lodging per cent

Conclusion

The plant height & lodging per cent have been reduced due to foliar application of mepiquat chloride 5 % Aqueous Solution @ 75 g a.i. ha-1 (1.5 l ha-1) with two spray (one spray at tillering stage 40 DAT and second spray at panicle initiation stage 80 DAT) along with 150 per cent RDN which resulted in more grain yield and net returns. Further, it can be concluded that the application of mepiquat chloride 5 % AS @ 75 g a.i. ha-1 (1.5 l ha-1) before panicle initiation (75-80 DAT) on paddy crop found to be safe and effectively reducing the crop lodging and improving the yield and yield components.

References

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How to cite this article

Priyanka J., Ramesha Y.M., Krishnamurthy D., Siddaram and Chandra Naik M. (2023). Effect of Different Levels of Nitrogen and Growth Retardant on Yield and Lodging Per Cent in Transplanted Rice (Oryza sativa L.). Biological Forum – An International Journal, 15(1): 189-195.