Physiological Response of Rice Genotypes under different Nitrogen Levels and Irrigation Regimes during rabi Season

Author: K. Sridhar, A. Srinivas, K. Avil Kumar, T. Ramprakash and P. Raghuveer Rao

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Abstract

Growing rice under Alternate Wetting and Drying irrigation system is quite different from the conventional flood irrigation as it may lead to a greater loss of applied soil nitrogen compared to that under traditional submergence conditions. A field study was conducted during rabi 2016-17 and 2017-18 seasons at Agricultural Research Institute Main Farm, Rajendranagar, Hyderabad with an objective to study the effect of alternate wetting and drying irrigation regimes on rice genotypes under varied nitrogen levels. The study consisted of three irrigation regimes viz., (recommended submergence of 2 to 5 cm water level as per crop growth stage, Alternate Wetting and Drying irrigation of 5 cm when water level drops to 3cm in field water tube, Alternate Wetting and Drying irrigation of 5cm when water level drops to 5 cm in field water tube) which are main plot treatments and three levels of nitrogen (120, 160 and 200 kg N ha-1) as sub plot treatments and two varieties of rice (KNM-118 and JGL-18047) as sub-sub plot treatments which were laid out in split-split plot design and replicated thrice. A significant improvement in the performance of physiological growth parameters of rice varieties was observed with irrigation regime recommended submergence of 2 to 5 cm water level as per crop growth stage which was on par with Alternate Wetting and Drying irrigation of 5 cm when water level drops to 3cm in field water tube. Higher physiological growth parameters of Rabi Rice varieties was reported with the application of 200 kg N ha-1 which was at par with application of 160 kg N ha-1.

Keywords

Alternate wetting and drying irrigation regime, nitrogen levels, varieties, dry matter partitioning, SPAD, root length, root volume

Conclusion

From the observations of the present study, AWD irrigation of 5 cm when water level drops below 3 cm from soil surface in perforated pipe (I2) with application of 160 kg N ha-1 in either of varieties JGL-18047 and KNM-118 is needed for superior performance in terms of physiological parameters like leaf area duration, dry matter partitioning, SPAD readings in rice.

References

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How to cite this article

K. Sridhar, A. Srinivas, K. Avil Kumar, T. Ramprakash and P. Raghuveer Rao (2022). Physiological Response of Rice Genotypes under different Nitrogen Levels and Irrigation Regimes during rabi Season. Biological Forum – An International Journal, 14(4): 424-431.