Effect of plant growth-promoting bacteria and soil compaction on barley seedling growth, nutrient uptake, soil properties and rhizosphere microflora |
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Authors: | Mustafa Y Canbolat Serdar Bilen Ramazan Çakmakç? Fikrettin ?ahin Adil Ayd?n |
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Institution: | (1) Department of Soil Science, Faculty of Agriculture, Atatürk University, 25240 Erzurum, Turkey;(2) Atatürk University Technical Vocational School Yspir and/or Biotechnology Application and Research Center, 25240 Erzurum, Turkey;(3) Department of Plant Protection, Faculty of Agriculture, Atatürk University, 25240 Erzurum, Turkey;(4) Department of Genetic and Bioengineering, Faculty of Engineering and Architecture, Yeditepe University, 34755 Istanbul, Turkey |
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Abstract: | Inoculants are of great importance in sustainable and/or organic agriculture. In the present study, plant growth of barley
(Hordeum vulgare) has been studied in sterile soil inoculated with four plant growth-promoting bacteria and mineral fertilizers at three different
soil bulk densities and in three harvests of plants. Three bacterial species were isolated from the rhizosphere of barley
and wheat. These bacteria fixed N2, dissolved P and significantly increased growth of barley seedlings. Available phosphate in soil was significantly increased
by seed inoculation of Bacillus M-13 and Bacillus RC01. Total culturable bacteria, fungi and P-solubilizing bacteria count increased with time. Data suggest that seed inoculation
of barley with Bacillus RC01, Bacillus RC02, Bacillus RC03 and Bacillus M-13 increased root weight by 16.7, 12.5, 8.9 and 12.5% as compared to the control (without bacteria inoculation and mineral
fertilizers) and shoot weight by 34.7, 34.7, 28.6 and 32.7%, respectively. Bacterial inoculation gave increases of 20.3–25.7%
over the control as compared with 18.9 and 35.1% total biomass weight increases by P and NP application. The concentration
of N and P in soil was decreased by increasing soil compaction. In contrast to macronutrients, the concentration of Fe, Cu
and Mn was lower in plants grown in the loosest soil. Soil compaction induced a limitation in root and shoot growth that was
reflected by a decrease in the microbial population and activity. Our results show that bacterial population was stimulated
by the decrease in soil bulk density. The results suggest that the N2-fixing and P-solubilizing bacterial strains tested have a potential on plant growth activity of barley. |
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Keywords: | Plant growth promoting bacteria Phosphate solubilization Bacillus spp Soil compaction |
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