Species And Provenance Trials Hardwoods And Softwoods. Tanzania

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Date
1973/75
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Ministry Of Agriculture
Abstract
EAC/NORAD Lowland Afforestation Project was initiated to carry out forest research in the agricultural marginal lands along the coast of Tanzania, Kenya and in the inland of Uganda. One of the main objects was to establish field species and provenance experiments, especially on pine. The project as scheduled to become operational in 1970-1971, but due to delays it did not officially start until 1973 . Seed from the project's phase I (completed in 1969), stored at E.A.A.F.R.O., was meanwhile distributed to the 3 participating countries. In Tanzania 2 pine species and provenance experiments were laid out as early as 1972. During the 3 successive years, from 1973 to the end of 1975, a series of such experiments were established. The present report reviews those in 1976 still intact experiments in Tanzania. All experiments are located at Kongowe, a few hundred metres from EAC/NORAD Lowland Project's research nursery. See map of trial plots. The site is within Ruvu North Forest Reserve, near Ruvu Afforestation Project's headquarters. The distance from Dar-es-Salaam is about 50 km, along the road from Dar-es-Salaam to Morogoro. The altitude on the experiment site is about 80 m, with a topography characterized as mainly flat or gently undulating. Height differences within the site may not exceed 15-20 metres. Vegetation, soil etc., may change considerably over short distance in spite of giving an immediate impression of uniformity. The site has previously been partly under cultivation. Remnants of food crop plants together with what local people can tell seems to prove this. These conditions are not favorable for establishment of field trials. The varying growth potential on cultivated and uncultivated ground may confound treatment differences and make statistical calculations uncertain. The soil has been characterized as a «freely drained sand with both exchange capacity and content of bases very low. The soils were not only light textured but low in
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