Growth Attributes and Growth Indices of Aerobic Rice as Influenced by Urease and Nitrification Inhibitors

Author: Mahantesh B. Nagangoudar, H.M. Jayadeva, B.S. Lalitha, D.C. Hanumanthappa, G.G. Kadalli and N. Umashankar

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Abstract

Slowing down the mineralization of urea fertilizers is imperative for achieving higher crop yields, as it allows for a more controlled release of nutrients, promoting optimal plant absorption. Additionally, this practice contributes to eco-friendly crop production by reducing nitrogen losses into environment. Hence, a field experiment was conducted to assess the impact of combined application of urease and nitrification inhibitors along with urea on growth attributes and growth indices of aerobic rice at Agronomy field unit, Zonal Agricultural Research Station, UASB, GKVK, Bengaluru for two years during summer, 2022 and 2023. The experiment was laid out in Randomized Complete Block Design with nine treatments (Urea, Urea + HQ @ 4000 mg kg-1 urea, Urea + HQ @ 8000 mg kg-1 urea, Urea + HQ @ 12000 mg kg-1 urea, Urea + DCD @ 4000 mg kg-1 urea, Urea + DCD @ 8000 mg kg-1 urea, Urea + DCD @ 12000 mg kg-1 urea, Neem coated urea and Absolute control) replicated thrice. Significantly higher leaf area, leaf area index and dry matter production at different crop stages were recorded with application of Urea + HQ @ 12000 mg kg-1 urea compared to other treatments on pooled basis. Growth indices viz., absolute growth rate, crop growth rate, relative growth rate and net assimilation rate during different growth phase of aerobic rice were also higher under combined application of urease and nitrification inhibitors than sole urea or neem coated urea application.

Keywords

Hydroquinone, Dicyanamide, Absolute growth rate, Crop growth rate, Net assimilation rate and Relative growth rate

Conclusion

The combined use of urease and nitrification inhibitors with urea proves to be a superior approach in promoting enhanced absolute growth rate, crop growth rate, relative growth rate and net assimilation rate in aerobic rice cultivation. The positive outcomes observed across these growth parameters indicate the potential of inhibitor-enhanced urea formulations for optimizing crop performance, thereby contributing to increased agricultural productivity and sustainability.

References

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How to cite this article

Mahantesh B. Nagangoudar, H.M. Jayadeva, B.S. Lalitha, D.C. Hanumanthappa, G.G. Kadalli and N. Umashankar (2023). Growth Attributes and Growth Indices of Aerobic Rice as Influenced by Urease and Nitrification Inhibitors. Biological Forum – An International Journal, 15(10): 1102-1107.