| | Unasylva - No. 94 - The role of tree plantations in savanna development |
 | | Within the former northern region of Nigeria, whose boundaries correspond approximately to those of the savanna, about 16 percent of the land is in crops or fallow, 37 percent is described as forest and 46 percent as uncultivated bush pasture and wasteland; 9.2 percent of the land is in forest reserves. |
 | | One of the principal problems in surveying savanna soils for future plantation establishment is the lack of adequate indicators, visible on the ground or from aerial photographs, for delineating the areas of different soils, particularly as to depth. |
 | | When savanna trees are cut and burned on the planting site, tree growth on the places where burning occurred is usually much superior to that on unburned areas; there are places, however, where the concentration of ash prevents the establishment of plants for several years. |
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