Improvement of soil fertility and rice yield after long-term application of cow manure combined with inorganic fertilizers oleh Peng GAO, Tuo ZHANG, Xing-yu LEI, Xin-wei CUI, Yao-xiong LU, Peng-fei FAN, Shi-ping LONG, Jing HUANG, Ju-sheng GAO, Zhen-hua ZHANG, Hui-min ZHANG