Variables of Microbial Response in Natural Soil Aggregates for Soil Characterization in Different Fluvial Land Shapes

Dengi̇z, Orhan; Kizilkaya, Rıdvan; Erkoçak, Aylin; Durmuş, Murat

doi:10.1080/01490451.2011.653089

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…The structure is subangular blocky throughout the profiles because there is no cultivation that could have otherwise caused structural breakdown by fracture and could also be due to the influence of soil genesis on profile development by ferrugination process involving clay translocation. This observation is consistent with findings of Lelago and Buraka (2019) and Dengiz et al (2013) who attributed the soil structure to clay translocation. Increasing quantity and grade of cutans down the profiles is indicative of a nitic property.…”

Section: Umir/esupporting

confidence: 93%

“…The development of subangular blocky structure especially in the sub-horizons can be attributed to decreasing levels of organic matter, increasing clay content and reduction in abundance of plant roots in the subsoil. These results are in accordance to findings of Lelago and Buraka (2019) and Dengiz et al (2013) who attributed angular soil structure to increasing clay content. Changes in consistence down the profiles in the study area can be attributed to differences in contents of organic matter and clay content.…”

Section: Umir/fsupporting

confidence: 93%

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A Geopedological Approach to Soil Classification to Characterize Soils of Upper Kabete Campus Field, University of Nairobi, Kenya

Mwendwa

Mbuvi

Kironchi

et al. 2020

Trop Subtrop Agroecosyst

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Background. The study area exhibits a first class catena having homogenous parent material and forming a spatial continuum. Functionally and taxonomically distinct soils result from differences in drainage and lateral movement of materials in the soil. Objective. To classify the soils using a geopedological approach which involves a strong relationship between pedology and geomorphology. Methodology. The area was delineated into Soil Mapping Units (SMUs) through augering into soils defined by different macro-relief. Mapping units were demarcated according to slope categories namely 0 to 5%, 5 to 8%, 8 to 16%, 16 to 30% and >30% connoted as flat to gently undulating (AB), undulating (C), rolling (D), moderately steep (E) and steep (F) respectively. Profile pits were dug in the five identified mapping units using Stratified Random Sampling technique. Identified SMUs include UmIr/F, UmIr/E, UxIr/D, UxIr/C and UxIr/AB in the order of decreasing slope gradient. The first entry represents the physiographic unit (Uplands, U), followed by physiographic position (lower middle uplands, m or uplands, undifferentiated levels, x), geology (I), color (r) and slope class respectively. A soil map with a legend describing the mapping units was produced using a scale of 1:10000. Topographic influence on soil properties was presented by Pearson’s correlation coefficient (r) with p-value included where the influence was significant. Statistical analysis was done using IBM SPSS 25th edition and MS Excel. Results. All the mapping units are well drained and deep to very deep (>80 cm). The color of the upper B horizon is predominantly dark reddish brown. The texture of top horizon is clay in UmIr/F and UmIr/E and is clay loam to clay, sandy clay loam to clay and loam to clay loam in UxIr/D, UxIr/C and UxIr/AB respectively, lucidly exposing the influence of topography on the depth of clay illuviation (clay: r = 0.724; p ≤ 0.01). The structure is predominantly subangular blocky throughout the profiles with the top horizon of cultivated areas having predominantly granular structure. Saturated hydraulic conductivity (Ksat) generally decreases with increasing clay content down the profiles and the bulk density ranges from 0.9 to 1.2gcm-3. Means of soil reaction of top horizons generally slightly decrease with decreasing gradient (r = 0.231) having lower values in cultivated areas. Percent organic carbon regularly decreases down the profiles with higher values in uncultivated, steeper areas (r = 0.521; p ≤ 0.05). In the top horizon: Total nitrogen is predominantly medium across the study area ranging from 0.2 to 0.56% (r = 0.185) and follows the organic carbon trend; Available phosphorus is deficient (<20 ppm) in the study area. Bases are sufficiently to richly supplied while micronutrients are richly supplied. All soils are non-saline and non-sodic; the cation exchange capacity (CEC) soil is predominantly medium across the profiles ranging from 15 to 27.6 cmol(+)/kg with values increasing slightly with increasing slope (r = 0.320). Based on data collected from description of the profiles and physicochemical data of the soils and according to IUSS Working Group WRB (2014) soil classification legend, the soils were classified as Mollic Nitisols. Implications. The soils are generally fertile for crop production but organic manure is recommended to buffer the acidic soil reaction, improve nitrogen and phosphorus sources. Conclusion. Soil characterization, land evaluation and precise input application are encouraged.

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Section: Umir/esupporting

confidence: 93%

Section: Umir/fsupporting

confidence: 93%

A Geopedological Approach to Soil Classification to Characterize Soils of Upper Kabete Campus Field, University of Nairobi, Kenya

Mwendwa

Mbuvi

Kironchi

et al. 2020

Trop Subtrop Agroecosyst

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“…The type, size and grade of structure in the surface horizons were uniformly described to have sub angular blocky, fine to medium and moderate, respectively. The development of blocky structure types could be related to the low level of organic matter, reduction in abundance of plant roots and higher clay percentage of subsoil horizons (Dengiz et al, 2013). The change in consistence characteristics from surface to subsoil horizons reflects the high contents of clay and low contents of organic matter of subsoil horizons.…”

Section: Site and Morphological Characteristicsmentioning

confidence: 99%

Determination of physico-chemical properties and agricultural potentials of soils in Tembaro District, KembataTembaro Zone, Southern Ethiopia

Lelago

Buraka

2019

Eurasian Journal of Soil Science (Ejss)

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The objectives of this study were to classify the soils of Tembaro district, and to identify its potentials for crop production. Five pits representing a pedon each were opened and profile in each pit was described for its morphological, physical and chemical characteristics according to standard procedures. A total of 20 disturbed soil samples and 16 core ring samples were collected from five representative profiles. The samples were analyzed in the laboratory for texture, BD, FC, PWP, Soil pH, EC, OC, TN, av.P, av.K, exchangeable bases, free and active iron and CEC. The results showed that the proportions of soil separates varied among profile and depth however, soils were all in clay textural class. The BD varied from 1.02 in the surface profile 1 to 1.25 g.cm-3 in the profile 3. Soil pH ranged from 6.8 to 5.4 in the surface horizons of all profiles with further decrease with depth indicating that the soils in the watershed are slightly acidic to moderately acidic. The OM and TN contents ranged from 2.90 to 5.43 and 0.23 to 0.45% in the surface horizon and they were in the low, low to medium and high categories respectively. The corresponding values for the remaining subsoil horizons were in the low categories. In all cases the contents of these parameters decreased considerably with depths. Available P was below critical values for all profiles and depths except for profiles 1 and 4. Exchangeable K was above critical value in all profiles with increasing trend along with depth of all profiles. Exchangeable Mg varied from 2.47 in surface horizon of profile 3 to 3.98 cmolc kg-1 in the surface horizons of profile 4 and increased with depth in all profiles except in profile 1. The observation with exchangeable K and Mg implies that there is leaching phenomenon in the study area. Ca ranged from 4. 35 cmolc kg-1 in profile 5 to 16.50 cmolc kg-1 in profile 1 with inconsistent trend with depth. The CEC from 18.22 cmolc kg-1 soil in surface horizon of profile 5 to 27.43 cmolc kg-1 soil in the surface horizons of profile 1 indicating they are in the medium to high ranges. But inconsistent trend in CEC distribution was observed with depth in all profiles. Based on the data collected from profile description study and soil physicochemical analytical data and according to FAO-WRD soil classification legend, the soil at Ambukuna watershed were classified as Haplic Nitisols (Endoeutric, humic), Haplic Nitisols (Hypereutric, humic), Haplic Nitisols (Endoeutric) and Haplic Nitisols (Epidystric, Humic). Most of the soil physical and some of the chemical characteristics studied could be ranked as good indicating that the area has high potential for agricultural production.

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“…When the results of the analysis were evaluated, the activity of phosphatase enzyme in soil samples was determined generally higher level in the surface soils than subsurface soils (except for Bss of PIV). Dengiz et al (2013) reported that one of the most effective factors is organic carbon on microbial population and their activities to get their energy and nutrient elements. This case was also supported by Nyamadzawo et al (2009) and Christensen and Sorensen (1985).…”

Section: Results and Discussion Physical Chemical Properties And CLmentioning

confidence: 99%

“…One of the most important indicators for soil development is structural growing (strong granular or block structure in surface and in subsurface horizons) stem from aggregate formation and aggregate size fractions. Dengiz et al (2013) carried out an investigation to determine changes in microbial response in natural soil aggregates for soil characterization in different fluvial land shapes. The majority soils of in their study area were classified as Typic Ustifluvent and Typic Haplustept in Soil Taxonomy.…”

mentioning

confidence: 99%

Phosphatase enzyme activity in different soils formed on bazaltic parent material under semi humid climate conditions

Erkoçak¹,

Dengi̇z

2019

International Journal of Agriculture Environment and Food Sciences

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Soil is a dynamic environment that differs in both time and space and contains many living species. These living species in the soil play an important role in bringing the vitamins and hormones that promote plant growth by storing plant nutrients dissolved in water. Soil microorganisms and some other macroscopic organisms increase soil fertility so they provide vegetation enhancement especially in natural ecosystems. These living species which help to form the soil by separating rocks and minerals are influential in the formation and development processes of the soils with the parent material, topography, climate and time factors. For this reason, microorganisms have significant functions on soil fertility and quality. Microbial activity is also important in biochemical soil processes as well as it is also associated with the presence of soil enzymes (Kiss et al., 1975; Nakas et al., 1987; Martens et al., 1992; Elliott et al., 1993). Soil enzymes are related with other biological properties of soil and play a vital role in mineralization processes (Frankberger and Dick, 1983; Tate, 1987). In addition to that, enzymes such as urease, phosphatase and β-glycosidase are involved in the mineralization of organic matter in the soil and have also more effect for soil fertility (Burns, 1978). Some researcher indicated that many factors such as organic matter and agricultural practices influence the present populations of microorganisms in the soil (Coxson and Parkinson, 1987; Kowalenko et al., 1978). Thus, determination for amounts of 22

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Variables of Microbial Response in Natural Soil Aggregates for Soil Characterization in Different Fluvial Land Shapes

Cited by 8 publications

References 32 publications

A Geopedological Approach to Soil Classification to Characterize Soils of Upper Kabete Campus Field, University of Nairobi, Kenya

A Geopedological Approach to Soil Classification to Characterize Soils of Upper Kabete Campus Field, University of Nairobi, Kenya

Determination of physico-chemical properties and agricultural potentials of soils in Tembaro District, KembataTembaro Zone, Southern Ethiopia

Phosphatase enzyme activity in different soils formed on bazaltic parent material under semi humid climate conditions

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