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,
Thai royal and noble titles a courtesy title pronounced with a middle tone, should not be confused with the similarly-spelled tree or the feudal title of Khun (, pronounced in a rising tone). The courtesy title is used for children born to a noble mother who gave up her title to marry a man of lesser rank; a notable example was the late Khun Poom Jensen. Today, this word is used informally to courteously address nearly anyone except those who hold a title of Mom Rajawongse or higher. It is T-V distinct from "thoe" (). Thai royal and noble titles Thai royal and noble titles