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Aims: To study the influence of inorganic and bio-fertilizers on nutrient uptake, soil fertility status and nutrient use efficiency of rice (Oryza sativa L.). Place and Duration of Study: The field trial was conducted in the experimental farm of Bidhan Chandra Krishi Viswavidyalaya, West Bengal, India during kharif season of 2016. Methodology: The experiment was carried out in a randomized block design with seven treatments each of which was replicated three times. The experiment was comprised of seven treatments viz. T1: control, T2: chemical fertilizer at 100% recommended dose of NPK, T3: 50% recommended dose of NP + 100% RDK + Bacillus polymyxa, T4: 75% recommended dose of NP + 100% RDK + Azotobacter chroococcum, T5: 75% recommended dose of NP + 100% RDK + Original Research Article Malo and Sarkar; CJAST, 38(6): 1-11, 2019; Article no.CJAST.53326 2 Bacillus polymyxa, T6: 50% recommended dose of NP + 100% RDK + Pseudomonas fluorescence and T7: 50% recommended dose of NPK + Bacillus polymyxa. Rice cultivar ‘IET-4786 (Shatabdi)’ was used as test crop. Results: Results of this study revealed that the maximum nutrient concentration in rice grain and straw; total N, P and K uptake (136.80, 37.07 and 184.65 kg ha -1 respectively); grain and straw yield; were obtained with the application of 100% recommended dose of chemical fertilizer (T2). T2 treatment was followed by 75% recommended dose of NP + 100% RDK + Azotobacter chroococcum (T4) and 75% recommended dose of NP + 100% RDK + Bacillus polymyxa (T5). Treatments T4 and T5 were significant in improving the soil health status including organic carbon content (0.38%), available N (183.29 and 172.43 kg ha -1 ), P2O5 (44.31 and 41.46 kg ha -1 ) and K2O (217.89 and 195.82 kg ha -1 ). Conclusion: Therefore, treatments T4 and T5 exhibited beneficial effect on improving soil health and nutrient use efficiency leading towards higher rice yield along with reducing soil deterioration and maintaining sustainability.

current journal of applied science and technology

Nutrient Uptake, Soil Fertility Status and Nutrient Use Efficiency of Rice as Influenced by Inorganic and Bio-fertilizer in New Alluvial Zone of West Bengal