Department of Pomology College of Horticulture South China Agricultural University Guangzhou 510642 China;
Department of Plant Nutrition College of Agricultural Resources and Environmental Sciences China Agricultural University Beijing 100094 China;
Department of Agricultural and Environmental Science The Queen's University of Belfast Newforge Lane Belfast BT9 5PX (UK);
arbuscular mycorrhiza; organic phosphorus; phosphatase; phosphate-solubilizing bacteria; rock phosphate;