Effects of Nitrogen Fertilizer on Nitrogen Absorption and Utilization of Japonica Hybrid Rice

doi:10.11924/j.issn.1000-6850.casb15010151

Abstract

Abstract: To explore dosage effects of nitrogen fertilizer on the formation of rice yield and nitrogen absorption and utilization, japonica hybrid rice cultivar ‘6 you 53’ was used as the material in this study to analyze the nitrogen uptake and utilization indicators in five nitrogen fertilization treatments based on the principle of precise and quantitative cultivation techniques. The results showed that the nitrogen accumulation of leaf and stem peaked at booting stage, and the total amount of nitrogen accumulation of spikes in mature stage increased with the increase of nitrogen. Leaves and stems of nitrogen translocation, nitrogen translocation efficiency, nitrogen contribution ratio, nitrogen physiological efficiency and nitrogen recovery efficiency increased firstly, and reached the maximum at 300.00 kg/hm². A downtrend was observed for nitrogen harvest index, nitrogen efficiency, nitrogen uptake efficiency, nitrogen fertilizer use efficiency, nitrogen fertilizer agronomic utilization rate, physiological nitrogen use efficiency, nitrogen partial productivity, and soil nitrogen dependency rate. Nitrogen recovery efficiency showed a significantly positive correlation with grain yield and panicle numbers, and showed a significantly negative correlation with spikelets per panicle. Panicle numbers showed a significantly negative correlation with the nitrogen fertilizer uptake efficiency and nitrogen harvest index. Meanwhile, panicle numbers were significantly and negatively correlated with nitrogen fertilizer efficiency, agronomic nitrogen use efficiency, physiological nitrogen use efficiency, partial factor productivity for applied nitrogen and soil nitrogen dependency rate. The 1000-grain weight exhibited a positive correlation with nitrogen translocation and nitrogen translocation efficiency. In conclusion, rational application of nitrogen fertilizer plays an important role in improving grain yield and nitrogen uptake and utilization.

CLC Number:

S511

Lu Weilin,Duan Renzhou,Yu Xinchun,Yan Deyuan,Guo Guiying,Quan Ruilan and Liu Xiangchen. Effects of Nitrogen Fertilizer on Nitrogen Absorption and Utilization of Japonica Hybrid Rice[J]. Chinese Agricultural Science Bulletin, 2016, 32(30): 1-6.

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