Soybean meal fertilizer includes various plant-based oil cakes like soybean, peanut, sesame, and blended seed meals—essentially the nutrient-rich residue left after oil extraction. These meals decompose slowly, providing a steady stream of essential nitrogen and trace minerals that tea plants need most. Though more expensive than chemical fertilizers or manure, it’s far better for soil health and helps produce tea with a more refined aroma. That’s why quality-focused tea farmers consider it an absolute essential. The tea bushes absorb these nutrients slowly, storing them up to nourish the upcoming spring tea harvest.