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With increasing global interest in microbial methods for agriculture, thecommercialization of biofertilizers in Sri Lanka is of general interest. Theuse of a biofilm-biofertilizer (BFBF) commercialized in Sri Lanka is claimed toreduce chemical fertilizer (CF) usage by ~50 per cent while boosting harvest by20-30 per cent. Many countries have explored the potential of biofilmbiofertilizers, but have so far found mixed results. Here we review this BFBFcommercialized in Sri Lanka and approved for nation-wide use there. We show indetail that the improved yields claimed for this BFBF fall within theuncertainties (error bars) of the harvest. Theoretical models that produce aseemingly reduced CF scenario with an "increase" in harvests, although this isin fact not so, are presented. While BFBF usage seems to improve soil qualityin certain respects, the currently available BFBF promoted in Sri Lanka hasnegligible impact on crop yields. We also briefly consider the potentialnegative effects of large-scale adoption of microbial methods.

A critical examination of crop-yield data for vegetables, maize and Tea for commercialized Sri Lankan biofilm biofertilizers