International Journal For Multidisciplinary Research

E-ISSN: 2582-2160   •   Impact Factor: 9.24

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Effect of Plant Growth-Promoting Rhizobacteria in the Hydroponic Cultivation of Red Amaranthus (Amaranthus tricolor L.)

Author(s) Elamparithi P, Arshath Farhana S, Beula Angel M, Kaviya S, Keerthika C, Maheshwari K, Poornima A, Priyangaa T, Reedhu Shifani C S, Sofia D P
Country India
Abstract The present study was conducted to evaluate the effect of Plant Growth-Promoting Rhizobacteria (PGPR), particularlyAzospirillumbrasilense, on the hydroponic cultivation of red amaranthus (Amaranthus tricolor L.). The experiment was carried out in the Laboratory of Agricultural Microbiology, Imayam Institute of Agriculture and Technology (IIAT),Thuraiyur. Red amaranthus plants were cultivated using a floating root hydroponic system, in which plants were supported by perforated plates placed over nutrient solution with roots continuously immersed.Four treatments were evaluated: T1 – Control (without PGPR application), T2 – Azospirillum brasilense, T3 – Commercial PGPR solution, and T4 – Azospirillum brasilense+ Commercial PGPR solution. The experiment was conducted in a Completely Randomized Design (CRD) with three replications. Growth and yield parameters, including plant height, root length, fresh weight of aerial parts, and dry biomass, were recorded at harvest. The results revealed that PGPR application significantly enhanced the growth and biomass production of red amaranthus compared with the untreated control. Plants treated with Azospirillum brasilense combined with commercial PGPR solution (T4) exhibited superior growth performance, recording higher plant height, root development, and fresh weight compared with individual PGPR treatments and control plants. The improved growth response may be attributed to the ability of PGPR to enhance nutrient availability, stimulate root development, and promote plant growth through biological nitrogen fixation and phytohormone production.The study demonstrates that integrating Azospirillum brasilense with commercial PGPR solution in a floating root hydroponic system is an effective approach for improving red amaranthus production. This technology has potential for sustainable vegetable cultivation by enhancing plant growth, reducing dependence on chemical fertilizers, and supporting the production of safe and nutritious food.
Keywords Azospirillumbrasilense, Plant Growth-Promoting Rhizobacteria (PGPR), hydroponics, floating root system, red amaranthus, biofertilizer, sustainable agriculture.
Field Biology > Agriculture / Botany
Published In Volume 8, Issue 4, July-August 2026
Published On 2026-07-17
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E-ISSN 2582-2160
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CrossRef DOI prefix of IJFMR is 10.36948/ijfmr

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