R. Gunasekaran, P. Kiruthika Lakshmi, S. Ahil Rishi Rajasekaran, A. Arockia Arul Sanjay, K.S., Ravik Kumar, S. Pradeep Kumaran, T. Jegan and P. Santhosh
Abstract
In the pursuit of ecologically safe agronomic practices, the utilization of natural substances such as algal biofertilizers is considered as a viable technology because of their potential to enhance plant growth and agricultural productivity. This study investigated the impact of Anabaena azollae on the soil profile and growth of onion (Allium cepa) plants. The incorporation of algal biomass as soil amendment significantly improved the micro- and macronutrient content of the soil, as well as increased the bacterial population, thereby favouring the growth of onion plants. Pot trials revealed a noteworthy enhancement in the morphological and biochemical profile of onion plants treated with Anabaena azollae. Growth promoting capability of Anabaena azollae was further authenticated by using hydroponic system, where an increase in the concentration of algal extract was observed to enhance plant growth. Bioactive principles present in Anabaena azollae were extracted by using methanol and identified by Gas Chromatography-Mass Spectrometry (GC-MS) analysis. Overall, the study highlights the efficacy of Anabaena azollae as a sustainable and promising alternative to chemical fertilizers for enhancing the growth and productivity of onion plants.