March 11,, Qingdao science and technology university college of more than 30 college students volunteer came to Qingdao northridge mountain forest park and carry out the "green, and I have an appointment with the tree" plant green add green activities. College students by himself the configuration of the biological chemical reagent and compound fertilizer, to trees to prevent diseases and insect pests, promote the growth of trees. It is reported, the use of the university students' green green pollution-free fertilizer, particularly adding the trace elements and organic matter, can improve soil permeability, promote trees root development, improve the trees into