Abstract
From wheat field soil samples of Chang’an, Shanxi, seven multifunctional strains with the ability of solubilizing phosphate and potassium were isolated for its utilization as a biological fertilizer, and the most efficient strain named CX-7 was chosen for further study. CX-7 was identified as Paenibacillus kribbensis after a series of physiological and biochemical experiments, morphological observation and 16S rRNA gene sequence analysis. The solubilization ability of CX-7 was tested in the condition of pure culture. The results show that 71.60 mg/L and 5.18 mg/L water-soluble phosphorus and 3.44 mg/L potassium can be released from phosphate powder, lecithin and potassium feldspar powder, respectively which means that CX-7 had the high degradation rate on inorganic phosphorus. Antagonistic experiment showed that CX-7 strain had widely antagonism against pathogenic microorganism (cotton yellow wilt pathogen, cotton wilt pathogen, wheat root rot diseases pathogen, wheat scab pathogens and Pestalotiopsis microspora). This suggests that the stain has potential for further evaluation for its use as a biological fertilizer and biological control regent. Key words: Paenibacillus kribbensis, phosphate solubilization, potassium solubilization, biological control regent.
Highlights
Silicate bacteria have the ability of decomposing soil potassium minerals, activate potassium for the absorption and utilization of plant, and increasing crop yield (Sun and Zhang, 2006; Tang and Zhang, 2008; Xu et al, 2007; Sheng et al, 2001)
From wheat field soil samples of Chang’an, Shanxi, seven multifunctional strains with the ability of solubilizing phosphate and potassium were isolated for its utilization as a biological fertilizer, and the most efficient strain named CX-7 was chosen for further study
The results show that 71.60 mg/L and 5.18 mg/L water-soluble phosphorus and 3.44 mg/L potassium can be released from phosphate powder, lecithin and potassium feldspar powder, respectively which means that CX-7 had the high degradation rate on inorganic phosphorus
Summary
Silicate bacteria have the ability of decomposing soil potassium minerals, activate potassium for the absorption and utilization of plant, and increasing crop yield (Sun and Zhang, 2006; Tang and Zhang, 2008; Xu et al, 2007; Sheng et al, 2001). Paenibacillus kribbensis is one kind of silicate bacteria, which has the effect of potassium and phosphate-solubilization and nitrogen-fixing, so it is widely used in agricultural production in China (Zhang and Zuo, 2000). Paenibacillus is widely distributed in the environment and almost all the strains have one important characteristic, which is the ability against broad spectrum microorganisms by its secondary metabolites (Alvarez et al, 2006). P. kribbensis grows well on nitrogen-free medium including potassium feldspar, indicating its ability of nitrogen fixation and decomposition of the mineral potassium (Jing and Xu, 1997).
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