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Position: Home > Articles > 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 Journal of Integrative Agriculture 2019,18 (10)

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

作者：

Zhou Xing;Lu Yan-hong;Liao Yu-lin;Zhu Qi-dong;Cheng Hui-dan;Nie Xin;Cao Wei-dong;Nie Jun

单位：

Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China;Hunan Univ, Longping Branch, Grad Sch, Changsha 410125, Hunan, Peoples R China;Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China;Hunan Acad Agr Sci, Soil & Fertilizer Inst Hunan Prov, Changsha 410125, Hunan, Peoples R China;Minist Agr, Sci Observing & Expt Stn Arable Land Conservat Hu, Changsha 410125, Hunan, Peoples R China

关键词：

Chinese milk vetch;fertilizer application levels;rice yield;soil organic carbon;double-rice cropping system

摘要：

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 MFO, 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 MFO, the MF100 and MF40 resulted in a dramatically higher carbon sequestration rate (with the value higher by 71.6 and 70. whereas the MF80 induced a lower carbon sequestration rate with the value lower by 70.1% compared to the MFO. 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.

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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

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