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 at UC Berkeley. His dissertation focused on implementing an early computer-supported issue-based information system (IBIS), and he was a co-author on a research paper on IBIS with his dissertation chair Horst Rittel. Books: Edited Journals and Conference Proceedings: Catalog: Video: Douglas E. Noble Douglas E. Noble is an American architect and tenured faculty member at the USC School of Architecture. He is a fellow of the American Institute of Architects. He is known for his work in four overlapping arenas: Architectural Computing, Building Science, Architecture Education, and Design Theories and Methods. He received the ACSA/AIAS New Faculty Teaching Award in