Study on Root Growth Dynamic Characteristics of Grafted Seedlings of Different Camellia oleifera Cultivars Study on Physiological and Biochemical Responses of Camellia oleifera to Low Phosphorus Stress Aqueous Enzymatic Extraction of Oil-tea Camellia (Camellia oleifera) Seed Oil Effect of Storage on Qua lity of Oil in Camellia oleifera Cake