Amer GA, Utkheda RS (2000) Development of formulations of biological agents for management of root rot of lettuce and cucumber. Can J Microbiol 46:809–816

Article  PubMed  CAS  Google Scholar 

AOAC (1990) Official methods of analysis of the Association of Official Analytical Chemists. In: Helrich K (ed) Association of Official Analytical Chemists (AOAC) Inc., vol 1, 15th edn. AOAC, Arlington, VA, USA

Google Scholar 

Badalucco L, Kuikman PJ (2001) Mineralization and immobilization in the rhizosphere. In: Pinton R, Varanini Z, Nannipieri P (eds) The rhizosphere: biochemistry and organic substances at the soil–plant interface. Marcel Dekker, New York, pp 159–196

Google Scholar 

Bashan Y (1998) Inoculants of plant growth-promoting bacteria for use in agriculture. Biotechnol Adv 16:729–770

Article  CAS  Google Scholar 

Bashan Y, Holguin G (1998) Proposal for the division of plant growth-promoting rhizobacteria into two classifications: biocontrol-PGPB (plant growth-promoting bacteria) and PGPB. Soil Biol Biochem 30:1225–1228

Article  CAS  Google Scholar 

Bashan Y, Holguin G, de-Bashan LE (2004) Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances. Can J Microbiol 50:521–577

Article  PubMed  CAS  Google Scholar 

Bertrand H, Nalin R, Bally R, Cleyet-Marel JC (2001) Isolation and identification of the most efficient plant growth-promoting bacteria associated with canola (Brassica napus). Biol Fertil Soils 33:152–156

Article  Google Scholar 

Blake GR, Hartge KH (1986) Bulk density. In: Klute A (ed) Methods of soil analysis. Part 1. ASA-SSSA, Madison, WI, pp 363–375

Google Scholar 

Carrillo AE, Li CY, Bashan Y (2002) Increased acidification in the rhizosphere of cactus seedlings induced by Azospirillum brasilense. Naturwissenschaften 89:428–432

Article  PubMed  CAS  Google Scholar 

De Freitas JR, Banerjee MR, Germida JJ (1997) Phosphate-solubilizing rhizobacteria enhance the growth and yield but not phosphorus uptake of canola (Brassica napus L.). Biol Fertil Soils 24:358–364

Article  Google Scholar 

Deubel A, Gransee A, Merbach W (2000) Transformation of organic rhizodepositions by rhizosphere bacteria and its influence on the availability of tertiary calcium phosphate. J Plant Nutr Soil Sci 163:387–392

Article  CAS  Google Scholar 

Dobbelaere S, Croonenborghs A, Thys A, Ptacek D, Okon Y, Vanderleyden J (2002) Effect of inoculation with wild type Azospirillum brasilense and A. irakense strains on development and nitrogen uptake of spring wheat and grain maize. Biol Fertil Soils 36:284–297

Article  CAS  Google Scholar 

Farrell RE, Walley FL, Lukey AP, Germida JJ (1993) Manual and digital line-intercept methods for measuring root length: a comparison. Agron J 85:1233–1237

Article  Google Scholar 

Forbes BA, Sahm DF, Weissfeld AS (2002) Bailey and Scott's diagnostic microbiology, 11th edn. Mosby, St. Louis, MO, USA

Google Scholar 

Glick BR, Bashan Y (1997) Genetic manipulation of plant growth-promoting bacteria to enhance biocontrol of phytopathogens. Biotechnol Adv 15:353–378

Article  PubMed  CAS  Google Scholar 

Groleau-Renaud V, Plantureux S, Guckert A (1998) Influence of plant morphology on root exudation of maize subjected to mechanical impedance in hydroponic conditions. Plant Soil 201:231–239

Article  CAS  Google Scholar 

Gyaneshwar P, Kumar GN, Parekh LJ (1998) Effect of buffering on the phosphate-solubilizing ability of microorganisms. W J Microbiol Biotechnol 14:669–673

Article  CAS  Google Scholar 

Iyamuremye F, Dick RP (1996) Organic amendments and phosphorus sorption by soils. Adv Agron 56:139–185

Article  CAS  Google Scholar 

Jordan D, Ponder F Jr, Hubbard VC (2003) Effects of soil compaction, forest leaf litter and nitrogen fertilizer on two oak species and microbial activity. Appl Soil Ecol 23:33–41

Article  Google Scholar 

Kumar V, Narula N (1999) Solubilization of inorganic phosphates and growth emergence of wheat as affected by Azotobacter chroococcum. Biol Fertil Soils 28:301–305

Article  CAS  Google Scholar 

Lucy M, Reed E, Glick BR (2004) Applications of free living plant growth-promoting rhizobacteria. Antonie Van Leeuwenhoek 86:1–25

Article  PubMed  CAS  Google Scholar 

Martin JP (1950) Use of acid rose Bengal and streptomycin in the plate method for estimating soil fungi. Soil Sci 69:215–232

Article  CAS  Google Scholar 

Mehta S, Nautiyal CS (2001) An efficient method for qualitative screening of phosphate-solubilizing bacteria. Curr Microbiol 43:51–56

Article  PubMed  CAS  Google Scholar 

Nautiyal CS, Bhadauria S, Kumar P, Lal H, Mondal R, Verma D (2000) Stress induced phosphate solubilization in bacteria isolated from alkaline soils. FEMS Microbiol Lett 182:291–296

Article  PubMed  CAS  Google Scholar 

Oliveira ALM, Urquiaga S, Döbereiner J, Baldani JI (2002) The effect of inoculating endophytic N₂-fixing bacteria on micropropagated sugarcane plants. Plant Soil 242:205–215

Article  CAS  Google Scholar 

Olsen SR, Sommers LE (1982) Phosphorus. In: Page AL, Miller RH, Keeney DR (eds) Methods of soil analysis part 2. ASA-SSSA, Madison, WI, pp 403–427

Google Scholar 

Oussible M, Crookston PK, Larson WE (1992) Subsurface compaction reduces the root and shoot growth and grain yield of wheat. Agron J 84:34–38

Article  Google Scholar 

Pal SS (1998) Interactions of an acid tolerant strain of phosphate solubilizing bacteria with a few acid tolerant crops. Plant Soil 198:169–177

Article  CAS  Google Scholar 

Pikovskaya RE (1948) Mobilization of phosphates in soil in connection with vital activities of some microbial species. Mikrobiologia 17:362–370

CAS  Google Scholar 

Puente ME, Bashan Y, Li CY, Lebsky VK (2004a) Microbial populations and activities in the rhizoplane of rock-weathering desert plants. I. Root colonization and weathering of igneous rocks. Plant Biol 6:629–642

Article  PubMed  CAS  Google Scholar 

Puente ME, Li CY, Bashan Y (2004b) Microbial populations and activities in the rhizoplane of rock-weathering desert plants. II. Growth promotion of cactus seedlings. Plant Biol 6:643–650

Article  PubMed  CAS  Google Scholar 

Rodriguez H, Fraga R (1999) Phosphate solubilizing bacteria and their role in plant growth promotion. Biotechnol Adv 17:319–339

Article  PubMed  CAS  Google Scholar 

Rodriguez H, Gonzalez T, Goire I, Bashan Y (2004) Gluconic acid production and phosphate solubilization by the plant growth-promoting bacterium Azospirillum spp. Naturwissenschaften 91:552–555

Article  PubMed  CAS  Google Scholar 

Rojas A, Holguin G, Glick BR, Bashan Y (2001) Synergism between Phyllobacterium sp. (N₂-fixer) and Bacillus licheniformis (P-solubilizer), both from a semiarid mangrove rhizosphere. FEMS Microbiol Ecol 35:181–187

Article  PubMed  CAS  Google Scholar 

Şahin F, Çakmakçı R, Kantar F (2004) Sugar beet and barley yields in relation to inoculation with N₂-fixing and phosphate solubilizing bacteria. Plant Soil 265:123–129

Article  Google Scholar 

Salle AJ (1973) Laboratory manual on fundamental principles of bacteriology. McGraw-Hill, New York, USA

Google Scholar 

Shishido M, Chanway CP (1998) Forest soil community responses to plant growth-promoting rhizobacteria and spruce seedlings. Biol Fertil Soils 26:179–186

Article  Google Scholar 

Soil Survey Staff (1999) Soil taxonomy: a basic system of soil classification for making and interpreting soil surveys, 2nd edn. USDA-SCS Agriculture Handbook 436. US Government Printing Office, Washington, DC

Google Scholar 

Steenhoudt O, Vanderleyden J (2000) Azospirillum, a free-living nitrogen-fixing bacterium closely associated with grasses: genetic, biochemical and ecological aspects. FEMS Microbiol Rev 24:487–506

Article  PubMed  CAS  Google Scholar 

Sundara B, Natarajan V, Hari K (2002) Influence of phosphorus solubilizing bacteria on the changes in soil available phosphorus and sugarcane and sugar yield. Field Crops Res 77:43–49

Article  Google Scholar 

Vivas A, Marulanda A, Ruiz-Lozano JM, Barea JM, Azcon R (2003) Influence of a Bacillus sp on physiological activities of two arbuscular mycorrhizal fungi and plant responses to PEG-induced drought stress. Mycorrhiza 13:249–256

Article  PubMed  Google Scholar 

Welbaum GE, Sturz, AV, Dong ZM, Nowak J (2004) Managing soil microorganisms to improve productivity of agro-ecosystems. Crit Rev Plant Sci 23:175–193

Article  CAS  Google Scholar 

Yadav KS, Dadarwal KR (1997) Phosphate solubilization and mobilization through soil microorganisms. In: Dadarwal KR (ed) Biotechnological approaches in soil microorganisms for sustainable crop production. Scientific, Jodhpur, India, pp 293–308