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2023 Speakers

Umeoka Nkiru

Umeoka Nkiru, Speaker at plant biology conferences
Faculty of Biological Science, Imo State University, Nigeria
Title : Revegetation and restoration of abandoned ex-stone quarry lands with tree species in ihube, okigwe lga, imo state, nigeria

Abstract:

A randomized complete block design with six replicates was used to study the revegetation and restoration of abandoned ex-stone quarry lands with three tree species (Adenanthera pavonina L., Gmelina arborea Roxb. and Acacia auriculiformis A. Cunn. ex- Benth.) in Ihube, Okigwe Local Government Area, Imo State, Nigeria. At the site, each of the tree species occupied an area of 4.5m x 42.5m and was treated as a block. The trees were planted in each block at 2.5m x 2.m, which gives 12 rows of trees making a total of 36 trees per block and 108 trees of the entire experimental layout. N.P.K. (20:10:10) inorganic fertilizer treatments were  used to enhance tree growth and were applied at  the rates  of  0, 160, 320, 480 kg/ha while the  growth parameters of the tree seedlings investigated were plant height, stem girth, canopy sectional area, basal area and canopy cover. Data collected were subjected to analysis of variance (ANOVA), and means segregated using Least Significance Difference (LSD). Analysis of variance showed no significant effect (P<0.05) on the plant height, stem girth, basal area and canopy cover of the tree species; except on the canopy sectional area of the tree species. The study showed that Acacia auriculiformis A. Cunn. ex-Benth. had the highest plant height in all the treatments used (0 kg/ha= 495.13cm, 160 kg/ha=463.04cm, 320 kg/ha=360.50cm and 480 kg/ha=400.37cm). Gmelina arborea Roxb. had the highest stem girth in almost all the treatments used (0 kg/ha=20.28cm, 160 kg/ha=16.44cm, 320 kg/ha=13.20cm and 480 kg/ha=13.00cm). In Acacia auriculiformis A. Cunn. ex-Benth., 0 kg/ha (control) gave the highest canopy sectional area of 34640.60cm2, followed by 160 kg/ha with the value 29410.90cm2 in Adenanthera pavonia L. Gmelina arborea Roxb. had the highest mean basal area in all the treatments used (0 kg/ha=32.72cm2, 160 kg/ha=21.50cm2, 320 kg/ha=13.86cm2 and 480 kg/ha=13.45cm2). Acacia auriculiformis A. Cunn. ex-Benth. had the highest canopy cover in all the treatments used (0 kg/ha=2647.68cm2, 160 kg/ha=1652.82cm2, 320 kg/ha=3111.53cm2 and 480 kg/ha=1874.34cm2). The results obtained from the soil analysis showed that the sand content was increased by Adenanthera pavonina L. (72.60%) and Gmelina arborea Roxb. (70.60%). Gmelina arborea Roxb. and Acacia auriculiformis A. Cunn. ex-Benth. (11.60% and 10.60% respectively) increased the soil silt content while the clay content was generally decreased by the three tree species. The study showed that the establishment of the tree species with soil fertilization increased the soil Potassium (K), Calcium (Ca), Sodium (Na), Magnesium (Mg) and Exchangeable acidity (EA) by the three tree species. There was a decrease in Phosphorous (P), Base saturation (BS) and Effective Cation Exchange Capacity (ECEC) by the three tree species. Nitrogen content (N), Organic carbon (OC) and soil Organic matter (OM) increased only in Acacia auriculiformis A. Cunn. ex-Benth. From the study, the best tree for rehabilitating and restoring the quarried site was Acacia auriculiformis A. Cunn. ex-Benth. For optimal growth performance of trees for restoring an ex-stone quarry, 480 kg/ha N.P.K fertilizer application was the best. In terms of determining the restorative potential of plants and improvement of soil physical and chemical properties of the site, Acacia auriculiformis A. Cunn. ex-Benth and Gmelina arborea Roxb. were the best tree species. 

A randomized complete block design with six replicates was used to study the revegetation and restoration of abandoned ex-stone quarry lands with three tree species (Adenanthera pavonina L., Gmelina arborea Roxb. and Acacia auriculiformis A. Cunn. ex- Benth.) in Ihube, Okigwe Local Government Area, Imo State, Nigeria. At the site, each of the tree species occupied an area of 4.5m x 42.5m and was treated as a block. The trees were planted in each block at 2.5m x 2.m, which gives 12 rows of trees making a total of 36 trees per block and 108 trees of the entire experimental layout. N.P.K. (20:10:10) inorganic fertilizer treatments were  used to enhance tree growth and were applied at  the rates  of  0, 160, 320, 480 kg/ha while the  growth parameters of the tree seedlings investigated were plant height, stem girth, canopy sectional area, basal area and canopy cover. Data collected were subjected to analysis of variance (ANOVA), and means segregated using Least Significance Difference (LSD). Analysis of variance showed no significant effect (P<0.05) on the plant height, stem girth, basal area and canopy cover of the tree species; except on the canopy sectional area of the tree species. The study showed that Acacia auriculiformis A. Cunn. ex-Benth. had the highest plant height in all the treatments used (0 kg/ha= 495.13cm, 160 kg/ha=463.04cm, 320 kg/ha=360.50cm and 480 kg/ha=400.37cm). Gmelina arborea Roxb. had the highest stem girth in almost all the treatments used (0 kg/ha=20.28cm, 160 kg/ha=16.44cm, 320 kg/ha=13.20cm and 480 kg/ha=13.00cm). In Acacia auriculiformis A. Cunn. ex-Benth., 0 kg/ha (control) gave the highest canopy sectional area of 34640.60cm2, followed by 160 kg/ha with the value 29410.90cm2 in Adenanthera pavonia L. Gmelina arborea Roxb. had the highest mean basal area in all the treatments used (0 kg/ha=32.72cm2, 160 kg/ha=21.50cm2, 320 kg/ha=13.86cm2 and 480 kg/ha=13.45cm2). Acacia auriculiformis A. Cunn. ex-Benth. had the highest canopy cover in all the treatments used (0 kg/ha=2647.68cm2, 160 kg/ha=1652.82cm2, 320 kg/ha=3111.53cm2 and 480 kg/ha=1874.34cm2). The results obtained from the soil analysis showed that the sand content was increased by Adenanthera pavonina L. (72.60%) and Gmelina arborea Roxb. (70.60%). Gmelina arborea Roxb. and Acacia auriculiformis A. Cunn. ex-Benth. (11.60% and 10.60% respectively) increased the soil silt content while the clay content was generally decreased by the three tree species. The study showed that the establishment of the tree species with soil fertilization increased the soil Potassium (K), Calcium (Ca), Sodium (Na), Magnesium (Mg) and Exchangeable acidity (EA) by the three tree species. There was a decrease in Phosphorous (P), Base saturation (BS) and Effective Cation Exchange Capacity (ECEC) by the three tree species. Nitrogen content (N), Organic carbon (OC) and soil Organic matter (OM) increased only in Acacia auriculiformis A. Cunn. ex-Benth. From the study, the best tree for rehabilitating and restoring the quarried site was Acacia auriculiformis A. Cunn. ex-Benth. For optimal growth performance of trees for restoring an ex-stone quarry, 480 kg/ha N.P.K fertilizer application was the best. In terms of determining the restorative potential of plants and improvement of soil physical and chemical properties of the site, Acacia auriculiformis A. Cunn. ex-Benth and Gmelina arborea Roxb. were the best tree species. 

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