The Seaweed used as fertilizer is generally large economic algae, such as macroalgae, sporophyllosis, sargassum, etc. Seaweed spores contain auxins, cytokinins, gibberellins and other natural plant growth regulators, which have high biological activity. The proportions of various substances are similar to the proportions of various hormones in terrestrial plants.

Seaweed fertilizer contains a large number of disease-resistant factors and special ingredients, and has the dual functions of fertilizer and medicine. After the crops are sprayed with pesticides, their resistance to stress and disease is significantly enhanced, and foliar spraying can improve the efficacy of pesticides.

The seaweed fertilizer contains seaweed polysaccharides, oligosaccharides, mannitol, phenolic polymers, betaine, alginate, and natural substances, which have significant antibacterial, antiviral, and insect repellent effects. It truly plays a role as a fertilizer, greatly enhancing the cold resistance, drought resistance, disease resistance, lodging resistance, and salt alkali resistance of crops, and developing strong resistance to diseases such as epidemics, viral diseases, anthrax, downy mildew, gray mold, powdery mildew, and wilt. In addition, the alginate in seaweed fertilizer can reduce the surface tension of water, form a thin film on the surface of plants, increase the contact area, and make it easier for water-soluble substances to enter plant cells through the cell membrane of stem and leaf surfaces, enabling plants to effectively absorb the nutrients in seaweed extract. If seaweed fertilizer is mixed with insecticides and fungicides, it has a synergistic effect and can reduce spraying costs.

Algae fertilizer has greater yield increase effect and economic benefit on food crops such as corn, rice, barley, wheat, soybeans, sweet potatoes, peanuts, peas, cucumbers, tomatoes, eggplants, cabbage, ginger, watermelon, celery, green onions, garlic and other vegetable crops, and fruit trees such as apple, pear, peach, persimmon, citrus, banana, mango, grape, jujube, especially on economic crops such as cotton, tobacco, mulberry tea and horticulture. In summary, seaweed fertilizer, as a new generation of natural marine biological fertilizer, contains a variety of highly active ingredients and nutrients that cannot be compared to terrestrial plants. It has significant yield increasing effects and extremely strong stress resistance.