Abstract:
This study was carried out at Sinnar state, during the period 2012-2014. The aim of the study was to investigate the most important ecological factors that influence Acacia senegal and Acacia seyal growth and to assess the Socio-economic aspects which have direct impact on the ecology of both species at the study area. Also to study the most important uses of both Acacia senegal and Acacia seyal beside to find the best ways to address Acacia senegal and Acacia seyal planting to restore soil fertility of exhausted land. Tozi reserved forest was selected as a case study for this research. Soil samples under both natural species ( Acacia senegal and Acacia seyal) and from bare land vicinity for control were collected from depth (0-30cm) at 1.5 meter distance from trees . Samples were transported to the laboratory for analysis and obtained, N.P.K results were obtained . Also samples were taken from the leaves of both species at the study area, where they were analyzed and their constituent nutrients(N.P.K) identified. Also the socio-economic considerations of the communities living in close proximity to the forest were incorporated in the study. A questionnaire was designed for 79 people who represent a number of random samples of a number of villages bordering the forest. Data were analyzed by the Statistical Package for the Social Sciences, SPSS. The study revealed that nitrogen was higher under Acacia senegal and Acacia seyal and lower in bare land while phosphorus was more under Acacia senegal and Potassium was the same in all sites. Generally, the result showed that soil taken under both species is better compared to bare land. Also the study revealed the leaves of both Acacia senegal and Acacia seyal were rich of NPK.
The study revealed that the area was prosperous of these tree species. Also it revealed that it is possible to decrease deterioration at the study area through planting of suitable tree species to increase soil fertility.
