Christmas tree cultivation and oxygen. Nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, copper, chlorine, manganese, molybdenum, iron, and zinc are obtained from the soil. If the necessary elements are not available in the local soil, nutritious fertilizers are used. Other important soil considerations include pH and drainage. Certain types of soil are preferable, depending on the type of tree. Pine trees are usually better adapted to a sandy or sandy loam soil, while white spruce trees and fir trees, such as the Douglas-fir, prefer fine-texture loams and clay loam soils. Some trees grow well in all types of soil, but in any case,
Douglas M. Fraser previously served as Commander, Space Warfare Center, Schriever Air Force Base, Colorado; as well as Commander, Alaskan Command, United States Pacific Command; Commander, 11th Air Force, Pacific Air Forces; and Commander, Alaskan North American Defense Region, with headquarters at Elmendorf Air Force Base, Alaska. Prior to his final assignment, he was Deputy Commander, United States Pacific Command, Camp H. M. Smith, Hawaii Douglas M. Fraser Douglas Malcolm Fraser (born April 16, 1953), is a retired United States Air Force general who served as the Commander, United States Southern Command (USSOUTHCOM). He was the first U.S. Air Force officer to become