Christmas tree cultivation has shifted toward the production of higher-quality trees, increasing land quality expectations as well. Indeed, some species of tree, such as the Fraser fir, are unable to grow on low-quality, marginal farmland. Flat or gently rolling land is preferred to that with steep slopes and inclines, which is prone to erosion and fluctuations in fertility. Noticeable obstructions, such as rocks, fences or significant underbrush, are also undesirable. Like all crops and plants, Christmas trees require a specific set of nutrients to thrive. There are 16 elements crucial for growth; of those, three are obtained through air and water: hydrogen, carbon,
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