Organic manures are the primary source of crop nutrients in many African farming systems. The quantity of such materials that are available on farms and their quality are therefore important issues, especially in countries with limited land resources, such as Rwanda. In this study, different types...

Representative soils of the Central Rangelands of Somalia were described between Bulo Burti and Galcayo. Limitations in land use are caused by aridity, salinity, shallowness, erosion, and alkalinity, as well as by the low nutrient status. Suitable methods for reforestation are discussed. Fuelwood...

Analyses of soil and foliar samples are tabulated and discussed, in the context of observed growth abnormalities, chlorotic symptoms and decline in forest plantations. Foliar analysis (N, P, K, Ca, Mg, Al, Fe, Mn, Cu, Zn, B and S) in Pinus caribaea and P. oocarpa (aged between 6 months and 7 years) ...

On calcareous shallow, stony soils derived from tertiary limestone in the Yucatan peninsula, Mexico, forest trees develop deficiency symptoms such as reduced growth, loss of leaves, dieback of shoots and different patterns of chlorosis. Detailed observations combined with foliar analysis allow a...