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    					| Comparison of analytical procedures for measuring phosphorus content of animal manures in China |  
						| Guohua LI1, Qian LIU2, Haigang LI1,2(  ), Fusuo ZHANG1 |  
						| 1. Center for Resources, Environment and Food Security (CREFS), China Agricultural University, Beijing 100193, China 2. Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Key Laboratory of Grassland Resources, Ministry of Education, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China
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													    | Abstract The concentration and components of manure phosphorus (P) are key factors determining potential P bioavailability and runoff. The distribution of P forms in swine, poultry and cattle manures collected from intensive and extensive production systems in several areas of China was investigated with sequential fractionation and a simplified two-step (NaHCO3-NaOH/EDTA) procedures. The mean total P concentration, determined by the sequential fractionation procedure of intensive swine, poultry and cattle manure, expressed as g·kg−1, was 14.9, 13.4 and 5.8 g·kg−1, respectively, and 4.4 g·kg−1 in extensive cattle manure. In intensive swine, poultry and cattle manure about 73%, 74% and 79% of total P, respectively, was bioavailable (i.e., P extracted by H2O and NaHCO3) and 78% in extensive cattle manure. The results indicated the relative environmental risk, from high to low, of swine, poultry and cattle manure. There is considerable regional variation in animal manure P across China, which needs to be considered when developing manure management strategies. |  
															| Keywords 
																																																				diet phosphorus  
																		  																																				manure phosphorus  
																		  																																				sequential P fractionation |  
															| Corresponding Author(s):
																Haigang LI |  
															| Just Accepted Date: 27 August 2019  
																																														Online First Date: 16 October 2019   
																																														Issue Date: 29 November 2019 |  |  
								            
								                
																																												
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