Changes in phosphorus fractions associated with soil chemical properties under long-term organic and inorganic fertilization in paddy soils of southern China. oleh Waqas Ahmed, Huang Jing, Liu Kaillou, Muhammad Qaswar, Muhammad Numan Khan, Chen Jin, Sun Geng, Huang Qinghai, Liu Yiren, Liu Guangrong, Sun Mei, Li Chao, Li Dongchu, Sehrish Ali, Yodgar Normatov, Sajid Mehmood, Huimin Zhang