Studies on the Centella Asiatica Growth and Yield After the Application of Filtrates from Spirulina Species Isolates in Mangrove Ecosystem

An experiment was conducted at the Experimental Farm, Department of Microbiology, Faculty of Agriculture, Annamalai University to study Centella asiatica growth and yield after the application of filtrates from Spirulina species isolates Mangrove ecosystem. The present study aims to investigate the growth parameters of Spirulina species. The results of present include Spirulina isolates from MS1-MS10, among which MS7 strain recorded highest growth parameters. The experiment was laid out in randomized block design (RBD) with seven treatments and three replications using Centella asiatica variety IIHR CA-1. The results showed that the application of Spirulina extract significantly influenced the leaf area index (LAI) of the plant. The highest plant height was recorded under (T7) (Seedling root dipping + Foliar spray) at 30 and 60 days after transplanting, with the lowest stolon length recorded at harvest. The maximum leafy yield of 1.755 kg/pot was achieved under (T7). The phosphorous content in the leaves was significantly increased by applying Spirulina extract at different concentrations. The N, P, K, and asiaticoside content of the leaves were also significantly increased after applying a combination of treatments. The results also indicated a significant increase in Chlorophyll content and asiaticoside content. The application of Seedling root dipping + Foliar spraying of Spirulina extract (T7) was found to be more promising as an efficient method for maintaining soil fertility and ecosystem.