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 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 USSOUTHCOM's combatant commander. He previously served as Deputy Commander, United States Pacific Command from April 2008 to June 24, 2009. He assumed his final assignment on June 25, 2009. General Fraser earned his commission upon graduation from the United States Air Force Academy in 1975. His operational assignments include Europe, the Pacific, Air Combat Command and Air Force Space Command. He has