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analysis application Arboriculture areas assessed B.Sc bark Beech Brasier Britain British broadleaved species buds cent clones collection conifer Corsican pine crop culture damage deer Douglas fir Dutch elm disease East England effects experiments fertiliser Field Surveys Fomes annosus Forest Management Forest Research Forestry Commission fungus germination gley Grand fir Head of Branch height growth herbicides HMSO Hybrid larch improved increase IUFRO Japanese larch Laboratory Lodgepole pine M.I.For M.Sc method Miss nitrogen Northern Research Station Norway spruce nursery nutrient oxygen Paperpots Pathology peat Ph.D planting plot plough production progeny provenances recreation Region Report Research and Development Research Foresters root samples Scotland Scots pine Scottish season seed orchards seedbeds seedlings Service shoot showed Silviculture Silviculture South Sitka spruce soil South East England squirrels staff techniques temperature tested thinning timber treatments trees trials ultra low volume upland variation Wales weed control winter woodland yield