1. Alexander M 1965 Most probable number method for microbial populations 1467 p.In Methods of Soil Analysis, Part-II. Eds. C A Black et al. Soc. Agron. USA.
2. Anonymous 1980 Protein: Kjeldahl method. AOAC methods. 220 p.
3. Avivi Y and Feldman M 1982 The response of wheat to bacteria of the genus Azospirillum. Israel J. Bot. 31, 237–245.
4. Badgire D R and Bindu K J 1976 Effect of Azotobacter seed inoculation on wheat. Madras Agric. J. 63, 603–605.
5. Beck S M and Gilmour C M 1983 Role of wheat exudates in associative nitrogen fixation. Soil Biol. Biochem. 15, 33–38.