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 E. Noble Grant in 2011 for research related to the Samuel Freeman House, a residence designed in 1924 by Frank Lloyd Wright. Together, Noble and Kensek have received several awards for their innovative "NotLY: Not Licensed Yet" support system for individuals preparing for the Architect Registration Examination. In addition to completing several buildings as an architect, Noble is a widely recognized leader in championing and mentoring emerging architecture professionals. Noble founded the Ph.D. program at USC Architecture, and he has published articles and organized symposia on doctoral education in architecture. Noble completed a Ph.D. in the Design Theories and Methods (DTM) group