Asian Soil Research Journal http://journalasrj.com/index.php/ASRJ <p style="text-align: justify;"><strong>Asian Soil Research Journal</strong> aims to publish high quality papers (<a href="/index.php/ASRJ/general-guideline-for-authors">Click here for Types of paper</a>) in all aspects of soil research. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer reviewed, open access INTERNATIONAL journal.</p> Asian Soil Research Journal en-US Asian Soil Research Journal Pedotransfer Functions for Estimating Saturated Hydraulic Conductivity of Selected Benchmark Soils in Ghana http://journalasrj.com/index.php/ASRJ/article/view/30046 <p><strong>Aims:</strong> Direct methods of measuring saturated hydraulic conductivity (<em>K<sub>s</sub></em>), either <em>in situ</em> or in the laboratory, are time consuming and very expensive. Several Pedotransfer functions (PTFs) are available for estimating <em>K<sub>s</sub></em>, with each having its own limitations. In this study, the performances of four popular PTFs were evaluated on different soil classes in the semi deciduous zone of Ghana. The PTFs considered herein were Puckett et al. (1985), Campbell and Shiozawa (1994), Dane and Puckett (1994), and Ferrer-Julià et al. (2004). In addition, five local data derived PTFs were used to study the possibility of using local datasets to validate PTF accuracy.</p> <p><strong>Materials and Methods:</strong> A total of 450 undisturbed soil cores were collected from the 0 – 15 cm depth from three benchmark soils, namely, Stagni-Dystric Gleysol (SDG), Plinthi Ferric Acrisol (PFA) and Plinthic Acrisol (PA). The <em>K<sub>s</sub></em> of samples were measured by the falling-head permeameter method in the laboratory. Sand, silt and clay fractions, bulk density, organic matter content, and exchangeable calcium and sodium were measured and used as input parameters for the newly derived PTFs. Accuracy and reliability of the predictions were evaluated by the root mean square error (RMSE), coefficient of correlation (<em>r</em>), index of agreement (<em>d</em>), and the Nash-Sutcliffe efficiency (NSE) between the measured and predicted values from both tested and newly derived PTFs. The relative improvement (<em>RI</em>) of the newly derived PTFs from this study over the existing ones were also evaluated.</p> <p><strong>Results:</strong> The newly derived PTFs in this study had higher prediction accuracy with <em>r</em>, <em>d</em>, RMSE and NSE ranging from 0.80 – 0.99, 0.79 – 0.94, 0.14 – 1.74 and 0.84 – 0.98, respectively, compared with 0.32 – 0.45, 0.27 – 0.50, 4.00 – 4.90 and 0.41 – 0.47 for the tested PTFs. The relative improvement of the newly derived over the tested PTFs ranged from 56.50 – 95.71% in the SDG, 70.73 – 96.89% in the PFA, and 65.37 – 95.81% in the PA. Generally, <em>RI</em> was observed to be highest for Model 1 in the SDG, and Model 4 in both PFA and PA, and lowest for Model 5 in all three soils. It was observed that the inclusion of exchangeable calcium and sodium as predictors increased the predictability of the newly derived PTFs.</p> Henry Oppong Tuffour Awudu Abubakari Alex Amerh Agbeshie Abdul Aziz Khalid Erasmus Narteh Tetteh Ali Keshavarzi Mensah Bonsu Charles Quansah Jimmy Clifford Oppong Lawrence Danso ##submission.copyrightStatement## 2019-05-20 2019-05-20 1 11 Combined used of Dry Cocoa Bean Test Ash (Theobroma cacao L.) and Poultry Dropping for the Improvement of Soil Fertility and Maize (Zea mays L.) Growth and Yield on a Humid Alfisol Southwestern, Nigeria http://journalasrj.com/index.php/ASRJ/article/view/30047 <p>The combine use of dry cocoa bean testa ash and poultry droppings for the improvement of soil fertility, maize growth and yield was studied on an Alfisol south western Nigeria, located at Joseph Ayo Babalola University Ikeji-Arakeji, Ilesa Osun State, Nigeria. Research farm from April to July 2018 and from August to November 2018. Four treatments of poultry droppings (PD) at 5 tones &nbsp;ha<sup>-1</sup>, cocoa bean testa ash (CBTA) ash at 5 tones ha<sup>-1</sup>, mixture of poultry droppings and cocoa bean testa ash (PD + CBTA) at 2.5 tones ha<sup>-1</sup> each and control (C) were used in a Randomized Complete Block Design (RCBD) with three replications. The study showed that organic manure is a valuable fertilizer and can serve as a suitable alternative to inorganic fertilizer in the south western Nigeria especially, CBTA that has higher concentration of potassium (K) and organic carbon (OC). Poultry droppings (PD 2.5 tones ha<sup>-1</sup>) treatments plus cocoa bean testa ash (CBTA 2.5 tones ha<sup>-1</sup>) produced higher values for plant height, leaf area, chlorophyll, leaf area index, plant diameter, cob length, cob diameter and grain yield against the control that recorded the lowest value. Also, CBTA improves soil pH (94%) and OC (87%) over the control as well as increases minerals such as N, P, K Ca, Mg, and Na at 19%, 37%, 19%, 53%, 43% and 36% respectively.&nbsp; Organic fertilizer applications increase maize growth towards the later stage and were significantly different from the control according to DMRT at p&lt;0.05. Cocoa bean testa ash (CBTA) and poultry dropping (PD) application registered over 47% increases of N levels in the soil, from 0.15% to 0.77% to 0.84%. Organic carbon increased as poultry droppings plus cocoa bean testa ash were added to the soil. Maize grain yield increased from control plot to 1.95 t ha<sup>-1</sup> in CBTA + PD plot. The study recommends an application rate of cocoa testa ash and poultry droppings for maize growth on this type of soil in this agro-ecology.</p> Michael Rotimi Olojugba Ezike Florence Chinedu ##submission.copyrightStatement## 2019-06-13 2019-06-13 1 11 Assessment of Soil Quality Irrigated with Tube Well Water at University Fadama Farm Jega, Kebbi State University of Science and Technology, Aliero http://journalasrj.com/index.php/ASRJ/article/view/30048 <p>A research was conducted on the soils of teaching and research fadama farm of Kebbi State University of Science and Technology Aliero located at Jega, with the aim of assessing the soil quality irrigated with tube well water of the study area. The entire University Fadama land was divided into three sections namely T1, T2 and T3 and from each section, three (3) composite soil samples were collected. Each soil sample was collected 2meters away from a tubewell where water sample was also collected. Three (3) samples of the tube well water were collected from the three demarcated areas T1, T2 and T3, making a total of nine (9) samples. These samples were collected in a clean 75cl water bottle provided with a cap. Each water sample was analysed for pH, total dissolved solid (TDS), electrical conductivity (EC), sodium adsorption ratio (SAR), magnesium (Mg) and potassium (K). Soil sample was analyzed for pH, organic carbon, total nitrogen, available phosphorus. Result obtained showed that pH was 7.2, TDS 2.55 mg/l, EC 0.25 µs/cm, SAR 1.35, Mg 90.25, K 1.43 and RSC -3.8. Soil analysis showed that organic carbon content was 0.75 g/kg, total nitrogen 0.06 g/kg, Phosphorus 0.65 g/kg and CEC ranged 6.96-7.32 cmol(+)/kg. The study showed that soil in the area were low in fertility, therefore fertilizer of both organic and inorganic should be supplemented to make the soils more fertile. The soils were found to be free from salinity/sodicity problems at least for now.</p> M. A. Augie M. A. Adegbite A. R. Sanda I. Ahmed M. Ibrahim S. I. Zakari ##submission.copyrightStatement## 2019-07-04 2019-07-04 1 7 The Use of Homegarden Agroforestry Systems for Climate Change Mitigation in Lowlands of Southern Tigray, Northern Ethiopia http://journalasrj.com/index.php/ASRJ/article/view/30049 <p>Mitigation of climate change is one of the major environmental challenges facing the globe. In this context, homegarden agroforestry systems (HGAFs) have large potential for climate change mitigation. Therefore, this study was initiated to estimate the biomass and soil carbon stocks of HGAFs in relation to adjacent Natural Forest (NF). It also analyzed the relationship between woody species diversity, evenness and richness with biomass and soil carbon stocks. Three sites were purposely selected on the basis of the presence of HGAFs and NF adjacent to each other. Random sampling was used to select representative homegardens from the study population. In NF, a systematic sampling technique was employed. A total of 60 plots with a size of 10 m x 20 m were used to collect vegetation and soil data in both land uses. Soil samples were collected from each plot of the samples laid for vegetation sampling. Accordingly, 120 composite and 120 undisturbed soil samples from 0-30 cm and 30-60 cm soil depths were collected for soil organic carbon (SOC) and bulk density analysis respectively. Biomass estimation for each woody species was analyzed by using appropriate allometric equations. The result showed that the total amount of carbon stocks was 148.32±35.76 tons ha<sup>-1 </sup>and 157.27±51.61 tons ha<sup>-1</sup> in HGAFs and adjacent NF respectively which did not vary significantly between the two studied land uses (<em>P</em> &gt; 0.05). The finding also shows a positive but non-significant (<em>P</em>&gt;0.05) relationship between carbon stocks and woody species diversity, richness, and evenness. Specifically, in NF lands, woody species diversity with SOC (r=0.36) and in HGAFs species richness with biomass carbon (r=0.39) was correlated positively and significantly (<em>P</em>=0.05). We concluded that HGAFs have the same potential as the NF for carbon stock accumulation and to counteract the loss of biomass.</p> Gebru Eyasu Siyum Tuemay Tassew ##submission.copyrightStatement## 2019-11-04 2019-11-04 1 13