The aim of the study was to reduce the chemical fertilizers with microbial inoculant-rich vermicompost, which enhanced the growth, flowering, and soil health of the tuberose crop. A total of six treatments were applied with reducing doses of synthetic fertilizers under a factorial randomized design and replicated thrice. In this study, vermicompost (VC) made from cow dung and vegetable waste utilizing Eisenia foetida and their mixed biomass were enriched with microbial inoculants and assessed for their impact on microbial and enzymatic populations including urease, acid phosphatase activity and dehydrogenase activity in soil, nutrient availability, and tuberose development and flowering. The enriched vermicompost was effectively prepared through seventy- day incubation process involving rock phosphate, Azotobacter chroococcum, phosphate-solubilizing bacteria (Bacillus megaterium), and potassium-solubilizing bacteria (Frateuria aurantia). Compared with simple vermicompost, enriched vermicompost was found to be superior in terms of N, P, K, and micronutrient contents. The tuberose growth parameters revealed that treatment T3 (8-ton enriched VC ha-1) had the minimum number of days for 50% sprouting and the maximum number of leaves/plant among the different treatments, whereas T5 (50% RDF ha-1 + 4-ton enriched VC ha-1) and T6 (25% RDF ha-1 + 6-ton enriched VC ha-1) had the maximum plant height and the maximum number of shoots/bulb, respectively. With respect to the flowering parameters, plants fertilized with T4 (75% RDF ha-1 + 2-ton enriched VC ha-1) resulted in a minimum of 50% blooming, and plants fertilized with T5 presented a minimum number of days to spike visibility and opening of flowers and were superior in terms of the maximum floret and spike length, number of spikes/bulb, number of florets/spike, and vase life of the spike. Higher NP and K contents and soil microbial and enzymatic activities, such as those of soil bacteria, fungi, actinomycetes, total microbial population, urease, acid phosphatase, and dehydrogenase activities, were recorded in treatment T3, whereas the soil organic carbon content was on par with those in treatments T3 and T6. This study suggests that enriched vermicompost may replace 50% of synthetic fertilizers, increase flower yield, and improve soil health of tuberose.

Department of Agronomy Sardar Vallabhbhai Patel University of Agriculture and Technology Meerut 250110 UP India

Department of Biology Faculty of Science Taif University P O Box 11099 21944 Taif Saudi Arabia

Department of Chemistry Meerut College Meerut Chaudhary Charan Singh University Meerut 250005 Uttar Pradesh India

Department of Floriculture and Landscaping Sardar Vallabhbhai Patel University of Agriculture and Technology Meerut 250110 UP India

Institute of Business Studies Chaudhary Charan Singh University Meerut 250005 UP India

Krishi Vigyan Kendra Punjab Agricultural University Amritsar 143601 Punjab India

Soil Science Division Bangladesh Wheat and Maize Research Institute Dinajpur 5200 Bangladesh

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