Effect of different Levels of Irrigation and Nitrogen on Growth and Yield of Bt Cotton Grown on Alfisols

Author: S.G. Mahadevappa, G. Sreenivas, D. Raji Reddy, A. Madhavi and S.S. Rao

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Abstract

Marginal soils with shallow depth, low fertility status and low and erratic distribution of rainfall are the important factors affecting cotton growth, development and seed cotton yield and its optimization is important for sustainable production of the cotton. The best irrigation schedule and nitrogen level for Bt cotton in alfisols in Southern Telangana were determined through a field experiment carried out in the kharif of 2015 at the Agricultural Research Institute, Rajendranagar. Rainfed cotton was significantly inferior to irrigation at 0.8 IW/CPE, which resulted in significantly higher plant height (115 cm), dry matter at first picking (241 g plant-1), bolls plant-1 (22), seed cotton yield (1965 kg ha-1), lint yield (711 kg ha-1), stalk yield (2554 kg ha-1), and nitrogen uptake (99 kg ha-1). Significantly greater amounts of nitrogen were found in the following parameters: plant height (127 cm), dry matter at first picking (265 g plant-1), days to reach boll development (98 days), number of bolls plant-1 (22), boll weight (5.1 g), seed index (9.7 g), and seed cotton content. The notable rise in both yield and yield attributes might potentially be attributed to beneficial effects on growth attributes such as plant height, increased bolls plant-1, accumulation of dry matter plant-1, and its subsequent translocation towards sink, which boosted the yield of seed cotton. It is determined that for Bt cotton cultivated in alfisols, a higher seed cotton yield can be achieved by applying nitrogen at a rate of 150 kg ha-1 and scheduling irrigation at 0.4 IW/CPE.

Keywords

Irrigation, Nitrogen, Cotton (Gossypium hirsutum L.)

Conclusion

The experiment's results indicate that higher kapas yields of Bt cotton in the alfisols of the Southern Telangana Zone were achieved by applying nitrogen at a rate of 150 kg ha-1 and scheduling irrigation at 0.4 IW/CPE.

References

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How to cite this article

S.G. Mahadevappa, G. Sreenivas, D. Raji Reddy, A. Madhavi and S.S. Rao (2023). Effect of different Levels of Irrigation and Nitrogen on Growth and Yield of Bt Cotton Grown on Alfisols. Biological Forum – An International Journal, 15(10): 468-472.