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,
Robert Douglas, Count of Skenninge and died without issue. The daughter married an Oxenstierna. The remaining son, Gustaf, was first of the Swedish-born noble line of Douglas. He became a Colonel and Governor of Västerbotten. The Swedish noble family of Douglas descends from him. His grandson, Count Gustav Otto Douglas, was captured by the Russians during the Battle of Poltava, entered Russian service, and in 1717 was made Peter the Great’s Governor General over Finland. In the 1890s the then head of the family, Count Ludvig Douglas, was the Swedish foreign minister and Marshal of the Realm. His father Count Carl Israel Douglas (1824-1898) had