High-yield oil tea cultivars are superior germplasm resources for increasing camellia oil production

High-yield oil tea cultivars refer to superior oil tea types that have undergone long-term breeding and have mostly passed improved-variety approval. Their yield and oil content are markedly better than those of ordinary oil tea, and most have been fixed through asexual propagation from superior individual plants in ordinary oil tea stands. These cultivars generally show early fruiting, high and stable yields, large fruit, thin fruit skin, high seed yield and high kernel oil content, and they also maintain their peak production period for longer.

At present, the high-yield oil tea cultivars most widely promoted in production are often named in series, such as the Changlin series, Xianglin series, Cenruan series, as well as improved varieties of the Gan and Gui series. Different cultivars differ in adaptability, fruit size and maturity period, so before planting, they should be selected according to local climate and soil conditions, and attention should be paid to planting several cultivars together to improve pollination and fruit set.

Oil tea has strong adaptability, tolerates poor and thin soils and drought, and is suitable for development in the hilly and mountainous areas of southern China. It is not only an important woody oil tree species, but can also help conserve soil and water and green barren hills. Camellia oil has a high content of unsaturated fatty acids and is regarded as a high-quality edible vegetable oil. After oil pressing, the camellia seed cake and camellia shells can also be used for processing and utilization, giving it outstanding comprehensive value.

When cultivating high-yield oil tea cultivars, common problems include poor pollination caused by a single cultivar and weak tree vigor caused by improper site selection. It is recommended to choose sunny, gently sloping land with a thicker soil layer, use strong improved-variety seedlings and plant them at a reasonable density, carry out weeding, fertilization and pruning during the young plantation stage, and strengthen water and fertilizer management and pest and disease management after the stand matures, so that the high-yield potential of improved varieties can be continuously realized.