Comparison of key properties of short-chain polyphosphate fertilizers in market
Currently,the quality of short-chain polyphosphate fertilizers varied greatly.In the present study,10 typi-cal short-chain polyphosphate fertilizer samples were collected from the fertilizer market in China.Main features of these samples,including the contents of total N and total P(based on P2 05),polymerization degree,polymerization rate,solubility,etc,were determined,and the cluster analysis and Mantel test method were employed to compare the differences of these samples.It was shown that the average degree of polymerization was 4.00,and the average deviation between the measured values and the labeled values was 6.38％.The average polymerization rate was 83.8％,and the average deviation between the measured values and the labeled values was 2.59％.The total N content of these samples ranged from 8.6％to 28.7％,and the average deviation between the measured values and the labeled values was 2.59％.The total P content of these samples was 18.0％-64.2％.Mantel test results dem-onstrated that the total N content,the total P content,the pH value and salinity index were significantly(P＜0.05)correlated with polymerization rate,while the total P content,solubility,salt index and the content of biuret were sig-nificantly correlated with the degree of polymerization.In conclusion,the quality of short-chain polyphosphate fertil-izers in market varied greatly,and the labeled values differed from the determined values of main features in short-chain polyphosphate fertilizers.Thus,it was urgent and necessary to establish a unified measurement system to pro-vide more accurate and comprehensive information for consumers.
NETL
NSTL
万方数据
