Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (13): 2764-2770.doi: 10.3864/j.issn.0578-1752.2012.13.022

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Ryegrass Incorporation on Fertilizer N Cycling in a Double Rice System

 ZHU  Bo, YI  Li-Xia, HU  Yue-Gao, ZENG  Zhao-Hai, TANG  Hai-Ming, XIAO  Xiao-Ping, YANG  Guang-Li   

  1. 1.中国农业大学农学与生物技术学院，北京 100193
    2. 湖南省土壤肥料研究所，长沙 410125
  • Received:2011-12-12 Online:2012-07-01 Published:2012-02-14

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Abstract: 【Objective】 Effects of N use efficiency and N cycling were examined when the fresh ryegrass residue was  applied with urea in a double rice cropping system.【Method】 A 15N-labelled pot trail was conducted to estimate the effects       of different treatments of urea (CF), half N from urea plus half N from ryegrass residue (RGCF) and the control (CK, no fertilizer)  on soil mineral N concentration, rice yield, N use efficiency, N cycling and N2O emission.【Result】 Compared to CK, CF and  RGCF increased the biomass dry matter and grain yield of double rice. In comparison with CF, RGCF increased rice biomass dry matter and grain yield by 5.9% and 7.3%, respectively. Compared to CK, CF and RGCF increased the total N accumulation of double rice. No significant difference in total N accumulation was found between RGCF and CF. In comparison with CF, RGCF increased N dry matter production efficiency, N grain production and N agronomic efficiency, reduced 15N recovery efficiency and 15N harvest index. When compared with CF, RGCF improved the proportion of 15N fertilizer residue in soil and decreased N2O emission.【Conclusion】Urea application in conjunction with ryegrass residue could increase N use efficiency and improve N cycling in double rice soils.

Key words: ryegrass, 15N, double rice, nitrogen use efficiency, nitrogen cycling, urea

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