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,
Bicycle tree As of February 2013, some 85 systems of this manufacturer and type in use can hold 17,323 bicycles, all in Japan. Bicycle tree A bicycle tree or "cycle tree" or "bike tree" is a bicycle parking system that resembles a tree in shape. There are a few types that have been developed. Some are manual, some use mechanical means to move the bike, assisting the bike by raising into a particular spot, they can handle between 5-20 bicycles depending on size. They are made by various companies in Europe and North America. Still others, like the one made by JFE