National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Nitrogen use efficiency is considered as one of the most yield limiting factor for the rice production in all the rice growing regions of the world. This experiment was conducted to investigate the variation in nitrogen use efficiency of rice cultivars, the selection of rice cultivars with high nitrogen use efficiency, and the relationships of nitrogen use efficiency with the growth characteristics under non-limiting conditions of factors like water, fertilizer inputs. Variation in nitrogen use efficiency of rice cultivars was very low in 2010 (33.82 to 37.22) and in 2011 (34.38 to 38.33) but there were a high variation in nitrogen uptake efficiency was (0.55 to 0.79) and (0.56 to 0.68) for both the years and physiological utilization efficiency was (42.64 to 62.70) and (52.44 to 64.82) respectively. On average, nitrogen use efficiency of the 8 rice cultivars was 35.82 and 35.99, nitrogen uptake efficiency was 0.67 and 0.61 and physiological utilization efficiency was 54.29 and 59.45 respectively. For the year 2010, Nitrogen uptake efficiency was positively correlated with plant dry matter (0.846**) and leaf nitrogen content (0.943***) and for the year 2011, Nitrogen uptake efficiency was also positively correlated with plant dry matter (0.617) and leaf nitrogen content (0.820*). Therefore, the dry matter weight of rice plant was more important than leaf nitrogen content for characterizing nitrogen uptake efficiency and the result suggested that yield could be improved by optimizing the plant N uptake through improving the fertilizer N recovery efficiency.
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