Eco-Intensification of Brinjal Production Using Seaweed-Based Biostimulants and Beneficial Rhizobacteria

Abstract

Background and Aims: Seaweed-based bio stimulants and microbial biofertilizers are increasingly used in sustainable agriculture to enhance crop growth and productivity. Seaweed extracts contain several bioactive components such as plant growth regulators, micronutrients, vitamins, and amino acids that stimulate physiological processes in plants. Azotobacter, a beneficial bacterium, contributes to crop growth by fixing atmospheric nitrogen and producing growth promoting substances that improve nutrient uptake and root development. In the present study, the influence of seaweed extract and Azotobacter on the growth, yield, and fruit quality of brinjal (Solanum melongena) was evaluated under field conditions. Study Design: The experiment was conducted using Randomized Block Design with five treatments and three replications. Place and Duration of Study: The research was carried at experimental fields, department of agriculture and rural development, Maris stella college, Vijayawada between November 2025 to March 2026. Methodology: Seedlings were transplanted at a spacing of 60cm x 60cm, and the treatments included control, two concentrations of seaweed extract (2% and 4%) and their combinations with Azotobacter (2% and 4%). Observations were recorded on various vegetative, reproductive, and yield parameters throughout the crop growth period. Results: The results revealed that the integrated application of seaweed extract and Azotobacter significantly enhanced plant growth and productivity compared to the control. The treatment consisting of seaweed extract (4%) along with Azotobacter (4%) produced the best performance in terms of plant height, number of branches, stem girth, leaf size, and early fruiting. It also recorded higher fruit weight, fruit volume, fruit length, and yield per plant. Conclusion: The improved performance may be attributed to better nutrient availability, enhanced metabolic activity, and the synergistic interaction between seaweed extract and Azotobacter. Thus, the integrated use of seaweed extract and Azotobacter can be recommended as an eco-friendly and sustainable approach for improving the growth, yield, and fruit quality of brinjal.