International Science Community Association Research Journal of Recent Sciences 2277 - 2502 6 6 2017 06 2 Changes in soil nutrient levels under four Teak plantations and their corresponding natural vegetations in Ghana 5 12 EN Pachauri Tripti 1 Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Dayalbagh, Agra 282 110, India Lakhani Anita 2 Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Dayalbagh, Agra 282 110, India Kumari K. Maharaj 3 Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Dayalbagh, Agra 282 110, India Agyarko Kofi 1 University of Education, Winneba, College of Agriculture Education, Department of Crop and Soil Sciences Education, Ashanti, Ghana Abunyewa Akwasi A. 2 Kwame Nkrumah University of Science and Technology, College of Agriculture & Natural Resources, Faculty of Renewable Natural Resources, Department of Agroforestry, Kumasi, Ghana Bora Zinekena S.T. Tii 3 University of Education, Winneba, College of Agriculture Education, Department of Crop and Soil Sciences Education, Ashanti, Ghana Asare John 4 University of Education, Winneba, College of Agriculture Education, Department of Crop and Soil Sciences Education, Ashanti, Ghana Boakye Albert K. 5 University of Education, Winneba, College of Agriculture Education, Department of Crop and Soil Sciences Education, Ashanti, Ghana Abankwa Randy Y. 6 University of Education, Winneba, College of Agriculture Education, Department of Crop and Soil Sciences Education, Ashanti, Ghana > Research Paper 2017 4 17 2017 06 2 Though teak (Tectona grandis) plantations have been found in some cases to bring better soil conditions, other studies have found soil deterioration in teak plantations. The current study was therefore conducted to assess the impact of teak (Tectona grandis) plantation on some soil nutrients in four plantations of age, 7, 9, 12 and 17years in Ghana at Bedomase, Asamang, Ejura and Nsuta, respectively. Soil samples were randomly picked (0 -15cm) from the teak plantations and their adjacent natural vegetations; organic matter, total nitrogen, total phosphorus, available phosphorus, total potassium, exchangeable potassium, pH and electrical conductivity were determined using standard laboratory methods. Soil organic matter, total nitrogen, total and available phosphorus, total and exchangeable potassium, and electrical conductivity were higher in the 7 year old teak plantation than in the adjacent natural vegetation. With the exception of total phosphorus, total potassium and available phosphorus, all in the 12 year old plantation where the values were marginally higher in the teak plantation soil than its adjacent natural vegetation, all the other soil chemical properties were significantly higher in value in the natural vegetation than its adjacent 9, 12 and 17 year old teak plantations. The observed trend was assigned to the lower canopy closure, higher undercover vegetation and litter contribution in the 7 year old teak plantation which might have led to higher values in the assessed parameters than its adjacent natural vegetation in contrast to the older teak plantations (9, 12 and 17 year old teak plantations). Soil pH values between the teak plantations and their adjacent natural vegetations were not significant. The observed significant differences in soil nutrient values among teak plantations and among the natural vegetations could be attributed to differences in factors such as microclimate, soil biological community, litter quality, topography and nutrient status across the study areas. Generally the older teak plantations recorded lower values of soil nutrients than their adjacent natural vegetations as compared to the younger teak plantation. The current study has added to the observation that soil nutrients become deteriorated with age under teak plantations. Copyright@ International Science Community Association