Chang Dayong

Doctor, postgraduate tutor in the School of Life Sciences, Yantai University, Dean of Yantai Kaido Marine Biology Research Institute, director of the National Alliance of Leading Talents in Science and Technology Entrepreneurship, has many research results in apple calcium deficiency disease prevention, fruit rust prevention, and apple coloring .

Mr. Chang has applied for 53 invention patents, published more than 40 papers, and completed more than 30 scientific research results. He is a domestic leader in calcium regulation and calcium supplementation for apples to prevent calcium deficiency diseases such as bitter acne, and he has unique insights in mineral movement. The "DouLijing" products can reduce the incidence of calcium deficiency diseases such as apple bitter pit from 30% to less than 5%. It is the only product in the world that can solve the calcium deficiency disease of bagged apples. In particular, "DouLijing" can promote the transfer of calcium from leaves to fruits, and proposes a new mineral movement theory, breaking the theory of more than 30 years that calcium is difficult to move.