Seaweed has been used as an agricultural fertilizer for approximately two thousand years, offering a rich source of vitamins, minerals, omega-3 fatty acids, trace elements, soluble fibers, and iodine. Seaweed fertilizers (SFs) promote plant growth, boost disease resistance, and improve tolerance to adverse climatic conditions by enhancing soil moisture and nutrient retention. Derived from various species, SFs contain beneficial compounds like phytohormones (auxins, gibberellins) and betaines, along with minerals such as zinc and iodine. Alginic acid, present in brown algae, strengthens cell walls and aids nutrient uptake. Preparation methods for SFs include composting, liquid extraction, and direct application of fresh or dried seaweed. SFs serve as an economical substitute for synthetic fertilizers, stimulating seed germination, seedling establishment, and overall plant growth, leading to improved crop yields and enhanced bioactive compounds, thereby supporting sustainable agriculture.

Key words : Seaweed, agricultural, fertilizer, plant growth

Cite : Handique, L. (2025). Seaweed fertilisers: A marine solution to plant nutrition, growth, and yield. Vigyaksha, 1(1), 21–28. Newredmars Education.