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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (4): 1219-1226.doi: 10.13287/j.1001-9332.201704.010

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Effects of nitrogen fertilizer application rate on nitrogen use efficiency and grain yield and quality of different rice varieties

CONG Xi-han1,2,3 , SHI Fu-zhi1,2,3 , RUAN Xin-min1,2,3 , LUO Yu-xiang1,2,3 , MA Ting-chen1,2,3 , LUO Zhi-xiang1,2,3*   

  1. 1Institute of Rice Research, Anhui Academy of Agricultural Sciences, Hefei 230031, China
    2Hefei Branch of National Rice Improvement Center, Hefei 230031, China
    3Key Laboratory of Rice Genetics and Breeding of Anhui Province, Hefei 230031, China
  • Received:2016-08-01 Online:2017-04-18 Published:2017-04-18
  • Contact: * E-mail: lzx6176@126.com
  • Supported by:
    This work was supported by the Na-tural Science Foundation of Anhui Province (1608085QC67), the Science and Technology Key Research Project of Anhui Province (1604a0702008), the Innovative Fund for Young Scholars of President of Anhui Academy of Agricultural Sciences (16B0102), the Subject Construction Project of Anhui Academy of Agricultural Sciences (16A0101), and the Seed Engineering Project of Anhui Academy of Agricultural Sciences (17D0101)

Abstract: To provide scientific basis for reasonable application of nitrogen and create varieties with high N use-efficiency, an experiment was carried out to study the effects of nitrogen fertilizer application rate on grain yield, N use rate and quality of different rice varieties. Four different genotypic rice varieties, Nipponbare, N70, N178 and OM052 were used as tested material and three levels of nitrogen application rate (0, 120, 270 kg·hm-2) were conducted. Urea as nitrogen source was applied as basal (70%) and panicle (30%) fertilizer. The results showed that nitrogen fertilizer could raise yield mainly because of the increased effective panicles and filled grains per panicle. When the N application rate was 120 and 270 kg·hm-2, OM052 had the largest grain yield among four varieties, being 41.1% and 76.8% higher, respectively compared with control. Difference in grain yield among four varieties was due to the difference of nitrogen use efficiency. Under 120 and 270 kg·hm-2 nitrogen levels, Nipponbare had the lowest grain yield and N agronomic efficiency (NAE, 40.90 g·g-1 and 18.56 g·g-1), which was a variety with low N use-efficiency. On the contrary, OM052 had the highest grain yield and NAE (145.9 g·g-1 and 81.24 g·g-1), was a variety with high N use-efficiency. N fertilizer application increased the amylose content and protein content, lengthened gel consistency, reduced chalky kernel, chalkiness, and alkali digestion value. With the increase of N fertilizer application, hot paste viscosity, peak viscosity, consistence viscosity and breakdown viscosity were decreased gradually, and setback viscosity was increased. Correlation analysis showed that the yield and yield components had more significant correlations with appearance quality, cooking and eating quality under low N level. This study confirmed that OM052 was a double high variety with extremely high N agronomic efficiency and yield. Reasonable application of nitrogen fertilizer could significantly increase effective panicles and filled grains per panicle, improve rice quality, and ensure high yield and superior quality simultaneously.