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Number of P-dissolving Bacteria in Main Type Soils of Shandong Province and Its Correlation with Soil P-Supplying Properties

WANG Jian1,LIU Bo2,CHEN Wen3,MENG Qing-hua4,LIU Ji-yong4(1.Shandong Total Station of Soil and Fertilizer,Jinan 250100,China;2.Agricultural Bureau of Anqiu city,Anqiu 262100,China;3.Agrotechnical Station of Renfeng town,Jiyang 251414,China;4.Shandong Research Center of Cotton,Jinan 250100,China)  
Three types of soil in Shandong Province were compared.The results showed that the average number of Pi-dissolving bacteria was 1.610×106 individual per gram in cinnamon soil being larger than that in cultivated meadow and brown earth,while the average number of soil Po-dissolving bacteria in cultivated meadow was 2.564×106 individual per gram being larger than that in cinnamon soil and brown earth;the average number of Pi-and Po-dissolving bacteria were 1.472×106 and 2.603×106 individual per gram respectively in the high-yielding field which were larger than that in the middle-and low-yielding fields.But the differences were not significant.Compared in the same soil or yield type,not only the number of Po-dissolving bacteria was significantly larger than that of Pi-dissolving bacteria,but also the correlation coefficients between the number of Po-dissolving bacteria and the contents of available P and slow releasing P were larger than those of Pi-dissolving bacteria.Both the correlation coefficients between the number of Po-dissolving bacteria and the P-supplying intensity,the contents of available P and slow releasing P were positive in the 3 soil and 2 yield types,but the number of Pi-dissolving bacteria was only positively correlated with the content of slow releasing P in brown earth and with P-supplying intensity and available P content in cultivated meadow.
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