Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (24): 5049-5056.doi: 10.3864/j.issn.0578-1752.2012.24.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Study on N Fertilizer Efficiency and the Residual Effect Under Rice-Oilseed Rape Rotation System

 BU  Rong-Yan, REN  Tao, LU  Jian-Wei, LI  Xiao-Kun, LI  Yun-Chun, WANG  Yang, LU  Jun-Ming   

  1. 1.College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070
    2.Agricultural Service Center, Datonghu Administration District of Honghu City, Honghu 433221, Hubei
  • Received:2012-05-07 Online:2012-12-15 Published:2012-10-09

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Abstract: 【Objective】 To optimize fertilization strategy further in the rice-oilseed rape rotation system, the effects of N fertilizer application on crop yield, N uptake, N use efficiency and the residual effects of N fertilizer applied in rice season were studied in the annual rotation system. Meanwhile, the economical benefit with different N fertilizer treatments in the rice-oilseed rape rotation system were estimated. 【Method】A field experiment, to study crop yield, N uptake, N use efficiency, the residual effects of N fertilizer and economical benefit in the rice-oilseed rape rotation system were conducted in Honghu county, Hubei province from May 2010 to May 2011. Different N application rate treatments was included in the rice season. While in the oilseed rape season the original treatment in the rice season was split into with and without N application sub-treatments. 【Result】 Due to the different application rate and allocations of N fertilizer, the differences among the yield, N use efficiency and economical benefit were significant. In rice season, the yield and N use efficiency were the highest when N application rate was 165 kg N•hm-2. The residual effects of N fertilizer applied in rice season were significant, which could improve the yield of oilseed rape, ranging from 107 to 644 kg•hm-2. The N uptake of oilseed rape also increased significantly, from 3.9 to 35.2 kg N•hm-2. The residual effects of N fertilizer were equivalent to 5-33 kg N•hm-2 N fertilizer applied in the oilseed rape season. The residual effects were positively correlated with N application rate. Nevertheless, in the rice season excessive N fertilizer application rate would decrease the rice yield, N use efficiency and economical benefit. Overall the economical benefit was the largest when both N application rate in rice and oilseed rape season were 165 kg•hm-2. 【Conclusion】Reasonable N fertilization could significantly increase yield of rice and oilseed rape. N application in rice season had a significant residual effect. Therefore, optimum N fertilization management in oilseed rape season should consider the residual effect of N application in rice season.

Key words: rice-oilseed rape rotation , N agronomic efficiency , the residual of nitrogen , the economical benefit

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