Contribution of selected plant growth promoting rhizobacteria to maize phosphorus nutrition as influenced by organic matter management
Final Report Abstract
Complementary effects of organic fertilization and application of plant growth-promoting rhizobacteria (PGPR) strains (Enterobacter radicincitans DSM 16656 and Pseudomonas fluorescens DR54) on plant growth and plant P uptake (maize, oilseed rape, phacelia) as well as on soil parameters were studied under semi controlled and field conditions. For the studies a field experiment with different long-term organic fertilizer treatments (control without organic fertilizer, cattle manure, biowaste compost) was used comprising two growing seasons. The soil from these field treatments was also used for further investigations regarding soil enzyme activities and mycorrhiza formation in a pot experiment (A). The contribution of PGPR to soil enzyme activities and mycorrhiza formation as influenced by the organic P source myo-inositol phosphate was studied in a second pot experiment (B). The organic fertilization enhanced plant growth and P uptake of maize in the pot and field experiments. The effect on P nutrition derived from the application of PGPR was rather indifferent. Plant P uptake was in parts increased, especially in combination with the nonfertilized soil. In the pot experiment (A), the application of the potential PGPR had no significant effects on the plant growth, but an increased P uptake of 27 % was observed for oilseed rape after the application of the E. radicincitans strain in the treatment without fertilization. Furthermore, in this experiment the phosphatase activities in soil showed a significant response to PGPR application, mainly after the application of the P. fluorescens strain and to the greatest extent in the non-fertilized soil under oilseed rape. In addition, the high soluble P content in the soil was increased of about 6 % on average after P. fluorescens application to maize. Similarly, in the pot experiment (B), PGPR application did not increase the plant growth, but affected positively the P uptake of maize in the non-fertilized soil. Furthermore, the application of the P. fluorescens strain promoted arbuscular mycorrhizal colonisation of maize in both pot experiments, especially in the non-fertilized soil. Even though there were no effects on plant growth and P uptake of maize derived from the PGPR application in the field, the application of the P. fluorescens strain increased the high soluble P content in soil at any sampling date on average of all fertilization treatments The results showed the potential of PGPR to affect the soil P cycle and plant P nutrition. Application of organic fertilizers can reduce these effects, probably due to the general improved nutrient status of soil.
Publications
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(2008): Effects of plant growth promoting rhizobacteria on mycorrhiza formation of Zea mays and Phacelia tanacetifolia. In: Book of Abstracts and Program: Plant - microbial interactions (PMI) 2008, 2- 6 July, Krakow (PL)
Baum, C., Eichler-Löbermann, B., Hrynkiewicz, K., Ruppel, S., Krey, T.
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(2009): Effects of plant growthpromoting rhizobacteria on mycorrhizal colonisation and phosphorus uptake of maize: Plant nutrient management under stress condition. In: 17th Int. symposium of CIEC in Cairo (Egypt), Nov. 2008, ISBN: 977-5041-61-9, 327 - 332
Krey, T., Baum, C., Ruppel, S., Eichler-Löbermann, B.
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(2009): Inoculation of plant growth promoting rhizobacteria on Zea mays L. and Brassica napus L. as influenced by organic fertilization: Effects on plant and soil P characteristics. In: 18th Symposium CIEC in Rome, More sustainability in agriculture - new fertilizers and fertilization management proceedings; ISSN: 1971-0755, 360 - 365
Krey, T., Caus, M., Baum, C., Ruppel, S., Eichler-Löbermann, B.
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Interactive effects of plant growth promoting rhizobacteria and organic fertilization on the P supply of Zea mays L. and Brassica napus L.. J. Plant Nutr. Soil Sci. (2010)
Krey, T., Caus, M., Baum, C., Ruppel, S., Eichler-Löbermann, B.
