Soil organic carbon contents as a result of various organic amendments to a vertisol

Hua, Keke; Wang, Daozhong; Guo, Zhibin; SCI

机构： Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Anhui Prov Key Lab Nutrient Recycling Resources &, Hefei 230031, Peoples R China;

关键词： Organic carbon retention efficiency Manure Long-term fertilization delta C-13 natural isotope Solid-state C-13 nuclear magnetic resonance