Drift Seaweed as a Multifunctional Resource for Sustainable Coastal Agroecosystems

The growing global population continues to intensify the demand for food and feed, thereby raising pressure on available soil and water resources. As a matter of fact, sustainable agricultural practices are urgently needed to reduce environmental strain while maintaining productivity. Conventional agriculture has long relied on synthetic fertilizers; however, their excessive use has led to soil degradation, water contamination, and ecological imbalance. Organic and nature‐based farming systems offer a viable alternative by improving soil health, supporting biodiversity, and ensuring the production of high‐quality food. Marine ecosystems, particularly oceans, provide vast and underutilized natural resources that can complement terrestrial agriculture. Among these resources, marine macroalgae (seaweed) are abundant in coastal regions and possess significant agronomic potential. Seaweeds are rich in essential nutrients, bioactive compounds, and growth‐promoting substances that enhance soil structure and replenish macro‐ and micronutrients. Consequently, seaweed‐based fertilizers improve soil fertility, water retention, and microbial activity, fostering resilient and productive agroecosystems. Despite these benefits, seaweed biomass is often mismanaged or discarded in landfills, contributing to coastal ecosystem degradation and greenhouse gas emissions. Sustainable management of this biomass through composting presents an environmentally friendly alternative that adds value to seaweed drifts while mitigating waste. Seaweed composting enhances soil fertility, reduces dependency on synthetic fertilizers, supports climate adaptation, and provides economic opportunities for coastal communities. Harnessing this marine resource through circular and eco‐friendly approaches can contribute significantly to global efforts toward sustainable agriculture and environmental conservation.