Browsing by Author "Gunnar, L."
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Item Nineteen Provenance Trials with Four Pine Species. Uganda(Ministry Of Agriculture, 1973/75) Gunnar, L.; Tor, J.B.The present technical report covers the species trials in Uganda under the auspicesof the EAC/NORAD Lowland Afforestation Project during the years 1971 to 1975. Only a few genera of the order Coniferae are indigenous in Africa and among those, the genus Pinus is not represented south of Sahara. A number of pine species have, however, successfully been established in that part of Africa and also in East Africa. Species like Pinus patu/a, P. radiata, P. elliottii and P. kesiya have proved to be easily established and fastgrowing and have been planted on a fairly large scale in the comparatively cool highland regions. Many more pines, e.g. P. taeda, P. massoniana, P. montezumae, P. michoacana, P. strobus, P. pseudostrobus and others, have also shown considerable promise on suitable sites. As long as planting areas were available in the East African highlands no serious attempts were made to establish plantations in the coastal lowlands. This may be the reason why the tropical (lowland) pines P. caribaea, P. oocarpa and P. merkusii (the latter maybe also because of being difficult to establish) were but little known in E.A. before the second half of the 1950's.Item Species And Provenance Trials With Hardwoods. Establishment Methods, Pinuscaribaea And Eucalyptus Tereticornis. Gede And Jilore, Kenya(1973/75) Tor, J.B; Gunnar, L.The present technical report covers seven field experiments in Kenya under the auspices of the EAC/NORAD Lowland Afforestation Project. The experiments in this report were planted during the years 1974 and 1975 in Gede and Jilore at Arabuko - Sokoke Forest Reserve in Kenya.Item Tube diameter and age of Seedlings for two Nursery and field experiments(Department of Silviculture, Agricultural University of Norway, 1973/75) Tor, J.B. ; Gunnar, L.; Department of Silviculture, Agricultural University of NorwayThe present Technical Report deals with two combined nursery and field experiments, both with Pinus caribaea var. hondurensis, and identical treatment plans. The objective was to study the effect of different tube diameters and varying lengths of time in the nursery, related to both nursery and field performances of the plants. The standard practice of tube diameter used in Uganda is 6.5 cm diameter, (4 inches lay-flat). The plants have an average height of 30 cm, raised for a period of eight months in nursery before planting out. The standard length of the tubes is 15.2 em (6 inches), and this is the tube-length also used in the two present experiments. Reducing the tube diameter to 4.9 cm (3 inches lay-flat) means great savings in soil quantity and total nursery cost. It has been thought that the quality of the planting stock is to a certain extent determined by the tube diameter. A choice of tube diameter should therefore be based on the two aspects: economy and plant quality. Plant quality is, however, hard to define by visual criteria, but rate of survival and growth after planting out in the field are both good indicators of plant quality. This is why the experiments have been followed up in the field.
