Pedosphere 15(4): 532--538, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Solubilization of rock phosphate in liquid culture by fungal isolates from rhizosphere soil
WANG Guang-Hua1,2, ZHOU De-Rui1, YANG Qian1, JIN Jian2 and LIU Xiao-Bing2
1 Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China). E-mail: guanghuawang@hotmail.com
2 Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin 150040 (China)
ABSTRACT
      Rock phosphate (RP) is a low efficiency P fertilizer that is directly applied to the soil and can be solubilized by phosphate-solubilizing microorganisms (PSMs) in fermentation or soil conditions. This study investigated dynamic solubilization of 2 concentrations of rock phosphate in a liquid culture with different dosages of glucose by two fungal isolates, Aspergillus niger P39 and Penicillium oxalicum P66, from soybean and wheat rhizosphere soil. Although during the 20 day culture period A. niger P39 had a stronger ability to acidify the culture media than P. oxalicum P66, soluble P concentrations at glucose dosages of 30 and 50 g L-1 with RP of 15 g L-1 in the culture solution were much higher by P. oxalicum P66. The greater effectiveness of P. oxalicum P66 compared to A. niger P39 in the solubilization of RP was strongly associated with the production of organic acids. This study suggested that for RP solubilization the type rather than the concentration of PSM-produced organic acids was more important.
Key Words:  Aspergillus niger, organic acids, Penicillium oxalicum, phosphate solubilization, rock phosphate
Citation: Wang, G. H., Zhou, D. R., Yang, Q., Jin, J. and Liu, X. B. 2005. Solubilization of rock phosphate in liquid culture by fungal isolates from rhizosphere soil. Pedosphere. 15(4): 532-538.
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