Journal of Integrative Agriculture ›› 2019, Vol. 18 ›› Issue (10): 2381-1392.DOI: 10.1016/S2095-3119(18)62096-9

• 论文 • 上一篇    下一篇

  

  • 收稿日期:2018-05-08 出版日期:2019-10-01 发布日期:2019-09-29

Substitution of chemical fertilizer by Chinese milk vetch improves the sustainability of yield and accumulation of soil organic carbon in a double-rice cropping system

ZHOU Xing1, 2, LU Yan-hong2, 3, LIAO Yu-lin2, 3, ZHU Qi-dong2, 4, CHENG Hui-dan2, 5, NIE Xin2, 5, CAO Wei-dong6, NIE Jun2, 3 
  

  1. 1 College of Resources and Environment, Hunan Agricultural University, Changsha 410128, P.R.China
    2 Soil and Fertilizer Institute of Hunan Province, Hunan Academy of Agricultural Sciences, Changsha 410125, P.R.China
    3 Scientific Observing and Experimental Station of Arable Land Conservation (Hunan), Ministry of Agriculture, Changsha 410125, P.R.China
    4 College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, P.R.China
    5 Longping Branch Graduate School of Hunan University, Changsha 410125, P.R.China
    6 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
  • Received:2018-05-08 Online:2019-10-01 Published:2019-09-29
  • Contact: Correspondence NIE Jun, Tel: +86-731-84693197, E-mail: niejun197@163.com; ZHOU Xing, Mobile: +86-13618489117, E-mail: evenxing@sina.cn
  • Supported by:
    This work was supported by the earmarked fund for China Agriculture Research System (CARS-22), the Key Special Projects in National Key Research and Development Plan of China (2017YFD0301504 and 2016YFD0300900), the Scientific and Technological Innovation Project in Hunan Academy of Agricultural Sciences, China (2017JC47) and the International Plant Nutrition Institute, Canada (IPNI China Program: Hunan-18).

Abstract:

The double-rice cropping system is a very important intensive cropping system for food security in China.  There have been few studies of the sustainability of yield and accumulation of soil organic carbon (SOC) in the double-rice cropping system following a partial substitution of chemical fertilizer by Chinese milk vetch (Mv).  We conducted a 10-year (2008–2017) field experiment in Nan County, South-Central China, to examine the double-rice productivity and SOC accumulation in a paddy soil in response to different fertilization levels and Mv application (22.5 Mg ha–1).  Fertilizer and Mv were applied both individually and in combination (sole chemical fertilizers, Mv plus 100, 80, 60, 40, and 0% of the recommended dose of chemical fertilizers, labeled as F100, MF100, MF80, MF60, MF40, and MF0, respectively).  It was found that the grain yields of double-rice crop in treatments receiving Mv were reduced when the dose of chemical fertilizer was reduced, while the change in SOC stock displayed a double peak curve.  The MF100 produced the highest double-rice yield and SOC stock, with the value higher by 13.5 and 26.8% than that in the F100.  However, the grain yields increased in the MF80 (by 8.4% compared to the F100), while the SOC stock only increased by 8.4%.  Analogous to the change of grain yield, the sustainable yield index (SYI) of double rice were improved significantly in the MF100 and MF80 compared to the F100, while there was a slight increase in the MF60 and MF40.  After a certain amount of Mv input (22.5 Mg ha–1), the carbon sequestration rate was affected by the nutrient input due to the stimulation of microbial biomass.  Compared with the MF0, the MF100 and MF40 resulted in a dramatically higher carbon sequestration rate (with the value higher by 71.6 and 70.1%), whereas the MF80 induced a lower carbon sequestration rate with the value lower by 70.1% compared to the MF0.  Based on the above results we suggested that Mv could partially replace chemical fertilizers (e.g., 40–60%) to improve or maintain the productivity and sustainability of the double-rice cropping system in South-Central China.

Key words: Chinese milk vetch ,  fertilizer application levels ,  rice yield ,  soil organic carbo ,  double-rice cropping system