|PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
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Index Copernicus ICV 2015: 85.95
NAAS RATING 2017: 5.38
A field experiment was conducted to assess the combined effect of bioinoculants on nutrient uptake, forskolin content (diterpene) and tuber yield of Coleus forskohlii (cutivar; K-8). The microbial inoculants such as Azotobacter chroococcum, Bacillus subtilis, Pseudomonas fluorescens, Glomus fasciculatum (VAM) were used. Bioagents such as Trichoderma harzianum and Pseudomonas fluorescens were used. Bioinoculants were examined along with graded levels of recommended dose of N and P2O5 with 100% K2O fertilizers. Nutrient uptake showed significant difference among the treatments. Forskolin estimation in tuberous roots quantitated by High Profile Liquid Chromatographic method and compared with standard procured from Natural Remedies, Bangalore. Forskolin in tuberous roots and tuber yield was maximum at harvest in the treatment of 100% NPK with combined inoculation of A. chroococcum, B. subtilis, T. harzianum, P. fluorescens and G. fasciculatum followed by plants inoculated with same consortia plus 75 % NP plus 100% K. The lowest nutrient uptake and forskolin content and tuber yield were recorded in uninoculated control plants supplemented with 50 % NP plus 100% K. This clearly showed that economically advantageous yields can be obtained with 75 % NP with 100% K and a saving of 25 % N can be achieved by using the above microbial consortia. This could be attributed that due to the effective use of consortia of bioinoculants with graded level of inorganic fertilizers.