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Featured researches published by Olateju Dolapo Adeyolanu.


Archives of Agronomy and Soil Science | 2013

Evaluation of two methods of soil quality assessment as influenced by slash and burn in tropical rainforest ecology of Nigeria

Olateju Dolapo Adeyolanu; Kayode S. Are; Gabriel A. Oluwatosin; Olukemi T. Ayoola; Ayodele Olumide Adelana

The sustainability of slash-and-burn agriculture for sustainable crop production has been a subject of controversy. The objective of this study was to quantify the effect of slash and burn on soil quality. Two sites, Ibadan (7° 23′ N; 3° 51′ E) and Akure (7° 17′ N; 5° 14′ E), within the tropical rainforest of Nigeria were selected for the study. Burnt and unburnt soils were cropped with maize, melon, and cowpea (in sole and intercrops). Soil and earthworm cast samples were collected and analyzed for physical, chemical, and biological indicators. Integration into soil processes and quality indices involved the transformation of analyzed indicators using Soil Management Assessment Framework (SMAF) and Multiple Variable Indicator Transform (MVIT) techniques. Organic matter, water-stable aggregates, pH, cation exchange capacity, macroporosity, and water infiltration were reduced after burning in both sites. Active carbon and potentially mineralizable nitrogen increased after burning at Ibadan but decreased after burning at Akure. Soil quality decreased after burning by a range of 11.3–24.8% using SMAF and MVIT, respectively, although only MVIT showed significant differences (p ≤ 0.05). Test crops increased in yields on burnt soils due to prompt release of nutrients to the crops; the benefit was dwarfed by the adverse effects of burning on soil quality indices.


Soil Science | 2011

Conservation Strategies for Effective Management of Eroded Landform: Soil Structural Quality, Nutrient Enrichment Ratio, and Runoff Water Quality

Kayode S. Are; Olaolu Babalola; Adebayo O. Oke; Gabriel A. Oluwatosin; Ayodele Olumide Adelana; Oluremi A. Ojo; Olateju Dolapo Adeyolanu

Water erosion remains a major threat to soil and water conservation in the humid tropics and, thus, requires effective conservation measures to curb it. To quantify the efficacy of vetiver grass (Chrysopogon zizanioides L.) strips and mulch in soil structural quality buildup and in reducing the eutrophic quality index and enrichments ratios of major nutrients, a study was conducted between 2007 and 2009 on eroded landform (8% slope) of a Typic Kanhapludalf in a subhumid region of southwestern Nigeria. Treatments were vetiver buffer strips (10 m vetiver grass strip [VGS]), vetiver mulch (6 Mg ha−1 vetiver grass mulch [VGM]), combined vetiver strips and mulch (10 m VGS + 4 Mg ha−1VGM), and a control (no buffer strips or mulch). Soil structural quality estimated by water-stable aggregates at 0- to 5-cm depth increased by 36%, 73%, and 64% under 10 m VGS, 6 Mg ha−1 VGM, and 10 m VGS + 4 Mg ha−1 VGM, respectively, more than the control. The corresponding increase in mean weight-diameter under the vetiver systems was 30%, 42%, and 47% higher than the control. The water-stable aggregates and mean weight-diameter at the 5- to 15-cm depth followed a similar trend in the 0- to 5-cm layer. The resistive potentials of the vetiver systems in reducing soil loss, sediment-associated nutrients, total suspended solids, and eutrophic quality index were significantly higher than the control because of an increase in surface hydraulic roughness, which were in the order of 6 Mg ha−1 VGM < 10 m VGS < 10 m VGS + 4 Mg ha−1 VGM. Application of 6 Mg ha−1 VGM appear to be better than 10 m VGS and contributed to the reduction of runoff and enrichment ratios, thus, changing the order to 10 m VGS < 6 Mg ha−1 VGM < 10 m VGS + 4 Mg ha−1 VGM. The results indicate that an integration of vetiver buffer strips and mulch (10 m VGS + 4 Mg ha−1 VGM) had a better control of runoff, soil loss, sediment-associated nutrients, and water quality degradation, as well as improving soil structural quality buildup when compared with vetiver buffer strips or mulch alone.


Agricultura tropica et subtropica | 2012

Comparative Effects of Vetiver Grass (Chrysopogon zizanioides) Strips, Vetiver Mulch and Veticompost on Soil Quality and Erodibility of a Sloping Land

Kayode S. Are; Ayodele Olumide Adelana; Olateju Dolapo Adeyolanu; Imoudu Anthony Oyeogbe; Lucas Adelabu

Abstract This study investigates the influence of vetiver grass strips (VGS), vetiver mulch (VGM) and composted vetiver prunes (veticompost) on soil quality of an eroded land in the Institute of Agricultural Research and Training, Ibadan (70 22’ N; 30 50’E), Nigeria. The treatments were 3-m wide VGS established at 10-m inter-row spacing, VGM imposed at 5 Mg ha-1, veticompost applied at 5 Mg ha-1 and a control (no-vetiver grass). All quality indicators including physical, chemical and biological indices and soil erodibility (K) factors were determined between 2008 and 2011. Results show that soil organic matter (SOM) and associated nutrients play a major role in soil quality variation. VGM had the highest impact on soil quality (76.5%) but not significantly different (P<0.05) from veticompost (72.5%). Soil quality ratings were in the order of VGM > veticompost > VGS > control. Significant and positive relationship (r = 0.92*) exist between soil quality ratings and maize yield, with 70% of grain yield variability accounted to the soil quality. K factor ranged from 0.013 to 0.030 Mg h MJ-1 mm-1 with the VGM and control plots having the least and highest K factors, respectively. Although the soil quality under veticompost is lower than vetiver mulch but the SOM and associated nutrients under veticompost enhanced better soil productivity, and thus accounted for higher crop yields than other treatments.


Cogent food & agriculture | 2016

Lead and cadmium contents in a medicinal plant/spice grown in an urban city of Nigeria

Olateju Dolapo Adeyolanu; Olalekan John Kadiri; Kayode S. Are; Gabriel A. Oluwatosin

Abstract Human exposure to heavy metals is a growing concern across Nigerian urban settings due to potential danger from consuming plants grown on contaminated soils. This study assessed the contents of lead and cadmium in soil and basil (Ocimum basilicum Lamiaceae) grown by vegetable farmers in Ojo Local Government Area of Lagos State, Nigeria. Using grid method, 36 points were located to collect soil samples at 0–15 and 15–30 cm depths, while plant samples were also collected simultaneously. The contents of lead and cadmium in soil and plants were determined and results were subjected to descriptive statistics while the transfer factor (TF) was calculated. Lead ranged from 1.85 mg kg−1 at the topsoil to 2.54 mg kg−1 at subsoil. Cadmium varied from 0.99 mg kg−1 at the topsoil to 1.41 mg kg−1 at subsoil. Average TF were 0.21 for Pb and 0.35 for cadmium. Distribution of lead and cadmium increased in order leaf < stem < root indicating that the root of basil may be useful in bioremediation of metal-contaminated soils. Although, the levels of lead and cadmium contents in the basil leaf are lower than other parts, there could be accumulation of these metals through long-term consumption of the leaf.


Journal of Agriculture, Forestry and the Social Sciences | 2017

Use efficiency of tropical rainforest soils of southwestern Nigeria as affected by agronomic practices

Olateju Dolapo Adeyolanu; Gabriel A. Oluwatosin; Kayode S. Are

Tropical soils generally have extremely delicate nature and lack resilience to recover once degraded. This is aggravated with increase in demographic pressure on land which has led to continuous and intensive cultivation of the land. With soil quality information, management options can be developed so as to improve the capacity of the soil to function within various ecosystem boundaries. This paper comprises of results of five experiments and it is a review of efforts made by the soil quality team of the Institute of Agricultural Research and Training, Nigeria, to identify physical, chemical and biological soil attributes that can serve as useful indicators in assessing the effects of management on soil quality. Five experiments were conducted by the team to assess effects of continuous cultivation, tillage practices, cropping systems and land use (tree versus arable crops) on soil quality. Our findings show that soil quality is aggraded, degraded or sustained, depending on the type of use and management options. Conventional management methods degraded soil quality indicators while farmers’ traditional practices minimize soil quality degradation. It is recommended that farmers’ practices that will protect sensitive soil quality indicators are panacea to soil quality management in forest ecology of the tropics. Keywords: Soil quality, management options, forest ecology, indicators, degradation


Cogent food & agriculture | 2016

Comparison of qualitative and quantitative approaches to soil quality assessment for agricultural purposes in South-western Nigeria

Olateju Dolapo Adeyolanu; Ayoade Olayiwola Ogunkunle

Abstract There has been a major challenge on how to develop soil quality standards to assess changes which are practical and useful to farmers. This study assesses soil quality using qualitative and quantitative indicators and established the relationship between the two methods of assessment. Two locations (farmer’s fields) were chosen for the study in each of three states (Oyo, Osun and Ekiti) in south-western Nigeria. In each of the farmlands, soil quality was assessed qualitatively on the field using soil health cards for visual indicators produced by natural resources conservation services of United State Department of Agriculture, and quantitatively by laboratory analysis of measured properties. The values of indicators by each of the methods of assessment were separately integrated into quantitative index using soil management assessment framework. The relationship between qualitative and quantitative methods was established using correlation analysis at α0.05. Qualitative soil quality index ranged from 65 to 90%. Quantitatively, the indices ranged from 64 to 87%. Significant positive relationships (r = 0.64 to 0.93) exist between qualitative and quantitative methods. From the results, the two methods can be used interchangeably for soil quality assessment but where fund is limiting as with peasant farmers, the qualitative approach is preferable.


Cogent food & agriculture | 2016

Distributions of cadmium and lead in peri-urban wetlands as influenced by soil organic matter, clay fraction, and moisture content

Ayodele Olumide Adelana; Gabriel A. Oluwatosin; Celinah Agunbiade; Kayode S. Are; Olateju Dolapo Adeyolanu

Abstract Environmental distribution of cadmium (Cd) and lead (Pb) were studied in two wetlands (alluvial plain and inland depression) in Ibadan, Nigeria. Mean and median values of variables measured across the wetlands showed that soil properties varied considerably. Hydraulic conditions, soil organic matter (SOM), and particle size distribution contributed to the distribution of heavy metals recorded. Profile distribution of Cd and Pb maintained two patterns: (1) linear distribution pattern, where concentrations of Cd and Pb increase and decrease respectively, with increase in soil depth and (2) middle depth enrichment. Active carbon (AC), SOM, and clay fraction affected the surface and profile distribution of Cd and Pb. Cadmium showed significant correlation (R2 = −0.61* and 0.64*) with AC and SOM, respectively, while Pb had R2 values of 0.77* and 0.57 with SOM and clay content, respectively. The non-residual fractions of the heavy metals increased with increasing metal loading and SOM. This study is useful in assessing chemical changes for Cd and Pb in different wetlands, and their potential release to the environment.


Soil & Tillage Research | 2009

Slash and burn effect on soil quality of an Alfisol: soil physical properties.

Kayode S. Are; Gabriel A. Oluwatosin; Olateju Dolapo Adeyolanu; Adebayo O. Oke


EURASIAN JOURNAL OF SOIL SCIENCE | 2018

Assessing soil quality issues for crop production function based on farmers’ perception: An experience from Itapaji Watershed in Southwestern Nigeria

Olateju Dolapo Adeyolanu; Kayode Stephen Are; Ayodele Olumide Adelana; Gabriel A. Oluwatosin; Oluwabunmi Aderonke Denton; Olufunmilayo Titilayo Ande; Olugbenga Egbetokun; Lucia Ogunsumi; James Alabi Adediran


Archive | 2016

SOIL & CROP SCIENCES | RESEARCH ARTICLE Comparison of qualitative and quantitative approaches to soil quality assessment for agricultural purposes in South-western Nigeria

Olateju Dolapo Adeyolanu; Ayoade Olayiwola Ogunkunle

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Kayode S. Are

Obafemi Awolowo University

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Adebayo O. Oke

Obafemi Awolowo University

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A.O. Adetayo

Obafemi Awolowo University

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O.A. Ojo

Obafemi Awolowo University

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O.T. Ande

Obafemi Awolowo University

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