Effect of Nitrogen Application on Nitrogen use Efficiency indices and Yield at Heading under different Nitrogen Levels of Rice Genotypes

Author: Devika S., Anjali Anand, Pavithra K.S., Elangovan A. and Ramesh R.

Download PDF

Abstract

The crucial role of nitrogen (N) in rice development emphasizes the potential of nitrogen fertilizer to increase yield. One key approach to maximize nitrogen use is the development of rice varieties with enhanced nitrogen use efficiency (NUE). The research specifically investigates the variations in genotypic physiological NUE and yield traits under different nitrogen levels. Under high nitrogen (HN) slit conditions, CRDhan 310 and Rasi showed increased nitrogen content compared to other genotypes. Notably, nitrogen use efficiency (NUE) increased with elevated nitrogen application at the heading stage in N22, Pusa44, and Vandana. However, there was no further increase observed at a higher nitrogen level than in HN. N22, especially when cultivated with nitrogen applied at an HN split level, exhibited higher Nitrogen Uptake Efficiency (NUpE) and Nitrogen Utilization Efficiency (NUtE). Nevertheless, as nitrogen levels and application increased, both uptake and utilization efficiencies decreased. Optimal grain production was achieved with a moderate level of nitrogen at the heading stage. Rasi stood out as it demonstrated the highest grain yield among genotypes under a moderate nitrogen (MN) split level. This finding suggests that a balanced and moderate approach to nitrogen application during the heading stage can lead to optimal grain production. This study provides valuable insights into how different rice genotypes respond to varying nitrogen levels. This knowledge is essential for developing more efficient and sustainable rice production practices, ultimately contributing to increased yields and environmental sustainability in agriculture.

Keywords

N Content, nitrogen utilization efficiency, Nitrogen uptake efficiency, yield, genotype, rice

Conclusion

The importance of nitrogen levels in influencing the nitrogen content in plants, particularly in rice genotypes such as CRDhan310 and Rasi. It emphasizes that these genotypes may have a higher nitrogen uptake or utilization capacity during the HN cleavage stage. The complex relationship between nitrogen levels, nitrogen utilization efficiency, and various physiological factors affecting nitrogen uptake in rice genotypes is acknowledged. The findings suggest that optimizing nitrogen application is crucial for maximizing yield while ensuring efficient use of nitrogen. The variability in nitrogen utilization efficiency among different genotypes and how this efficiency can be influenced by nitrogen levels is a key consideration. Short-term genotypes like N22 and High-N of Vandana are noted for strong nitrogen uptake and utilization efficiency, while certain long-term genotypes show reduced efficiency at high nitrogen levels. The comparison of genotypes across different nitrogen levels is highlighted as providing valuable insights into their performance under varying nutrient conditions. It emphasizes the importance of considering both the specific genotype and the timing and method of nitrogen application to optimize grain yield. The statement suggests that there is an optimal range for nitrogen application and that excessive nitrogen may result in diminishing returns in terms of grain yield.

References

-

How to cite this article

Devika S., Anjali Anand, Pavithra K.S., Elangovan A. and Ramesh R. (2023). Effect of Nitrogen Application on Nitrogen Use efficiency indices and Yield at Heading under Different Nitrogen Levels of Rice Genotypes. Biological Forum – An International Journal, 15(9): 1018-1023.