Browsing by Author "Dirim, Mehmet Sabri"
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Item Determination of soil erosion risk in the Mustafakemalpasa river basin, Turkey, using the revised universal soil loss equation, geographic Information system, and remote sensing(Springer, 2012-10) Özsoy, Gökhan; Aksoy, Ertuğrul; Dirim, Mehmet Sabri; Tümsavaş, Zeynal; Uludağ Üniversitesi/Ziraat Fakültesi/Toprak Bilimi ve Bitki Besleme Bölümü.; 0000-0002-4421-7936; 0000-0001-9901-6499; AAH-2993-2021; AAF-5336-2019; AAH-3316-2021; 35307739600; 35749507200; 35306490900; 6507710594Sediment transport from steep slopes and agricultural lands into the Uluabat Lake (a RAMSAR site) by the Mustafakemalpasa (MKP) River is a serious problem within the river basin. Predictive erosion models are useful tools for evaluating soil erosion and establishing soil erosion management plans. The Revised Universal Soil Loss Equation (RUSLE) function is a commonly used erosion model for this purpose in Turkey and the rest of the world. This research integrates the RUSLE within a geographic information system environment to investigate the spatial distribution of annual soil loss potential in the MKP River Basin. The rainfall erosivity factor was developed from local annual precipitation data using a modified Fournier index: The topographic factor was developed from a digital elevation model; the K factor was determined from a combination of the soil map and the geological map; and the land cover factor was generated from Landsat-7 Enhanced Thematic Mapper (ETM) images. According to the model, the total soil loss potential of the MKP River Basin from erosion by water was 11,296,063 Mg year(-1) with an average soil loss of 11.2 Mg year(-1). The RUSLE produces only local erosion values and cannot be used to estimate the sediment yield for a watershed. To estimate the sediment yield, sediment-delivery ratio equations were used and compared with the sediment-monitoring reports of the Dolluk stream gauging station on the MKP River, which collected data for > 41 years (1964-2005). This station observes the overall efficiency of the sediment yield coming from the Orhaneli and Emet Rivers. The measured sediment in the Emet and Orhaneli sub-basins is 1,082,010 Mg year(-1) and was estimated to be 1,640,947 Mg year(-1) for the same two sub-basins. The measured sediment yield of the gauge station is 127.6 Mg km(-2) year(-1) but was estimated to be 170.2 Mg km(-2) year(-1). The close match between the sediment amounts estimated using the RUSLE-geographic information system (GIS) combination and the measured values from the Dolluk sediment gauge station shows that the potential soil erosion risk of the MKP River Basin can be estimated correctly and reliably using the RUSLE function generated in a GIS environment.Item Fertility level determination of the soils in non calcic brown forest great soil group by soil analysis(Academic Journals, 2010-06-04) Tümsavaş, Zeynal; Aksoy, Ertuğrul; Dirim, Mehmet Sabri; Uludağ Üniversitesi/Ziraat Fakültesi/Toprak Bilimi ve Bitki Besleme Bölümü.; 0000-0001-9901-6499; AAH-2993-2021; AAH-3316-2021; 6507710594; 35749507200; 35306490900This research was carried out to determine the fertility levels of the soils in Bursa Province Non Calcic Brown forest great (NCBFG) soil group. For this purpose, 29 soil samples representing the research area were taken and some physical and chemical properties were determined. The research results showed that the sample soils were mostly sandy loam or sandy clay loam textured, but they had generally moderate texture with an acidic or neutral pH and were noncalcareous and had no signs of salinity problem. The soils' organic matter, total N and exchangeable K levels were insufficient, exchangeable Ca and DTPA+TEA extractable Zn contents were at moderate level, available P, exchangeable Mg and DTPA+TEA extractable Fe, Mn, Cu levels were sufficient. Chemical ffertilizer containing nitrogen and potassium should be applied at suitable forms, time, and methods regarding nitrogen and potassium requirements of the cultivated plant species and plant varieties in these soil types. In addition organic matter contents in these type soils should be increased with an application of organic matter to the soils.Item Soil mapping approach in GIS using landsat satellite imagery and dem data(Academic Journals, 2009-11) Aksoy, Ertuğrul; Özsoy, Gökhan; Dirim, Mehmet Sabri; Uludağ Üniversitesi/Ziraat Fakültesi/Toprak Bilimi Bölümü.; 0000-0002-4421-7936; 0000-0001-9901-6499; AAH-3316-2021; AAH-2993-2021; AAF-5336-2019; 35749507200; 35307739600; 35306490900The objective of this study was to create base soil survey maps of the studied lands using Landsat satellite imagery and Digital Elevation Model (DEM) data in a GIS framework. Specific goals were to generate soil maps and to test the usage probability of slope class map overlies colour composite images as a preliminary map for soil survey in a hilly terrain. Surrogate soil-landscape data layers were derived from Landsat satellite imagery and a 10 m DEM. The data were also used to produce 3D-view with slope class boundaries superimposed Landsat image and relief shaded map as a colour map in order to select possible site of soil profile pits and to define physiographic units. Six soil series formed on two different physiographic units were determined, described and sampled. Soil profiles have been classified according to Soil Taxonomy and FAO-Unesco soil map of the World legend classification systems. The methodology was adequate for soil survey and mapping of some types of soils.Publication The determination of soil boron fractions, their relationships to soil properties and the availability to olive ( olea europea l.) trees(Taylor & Francis Inc, 2019-04-14) Gürel, Serhat; GÜREL, SERHAT; Başar, Haluk; BAŞAR, HALUK; Keskin, Ece; Dirim, Mehmet Sabri; DİRİM, MEHMET SABRİ; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; 0000-0003-0019-3482; 0000-0001-9901-6499; AAH-3316-2021; AAH-2469-2021This study was conducted to investigate the various boron fractions in olive tree grown soils. The correlations between boron fractions in leaves, fruits and soil properties were examined. For this purpose cv "Gemlik" olive (Olea europaea L.) orchards were visited. Soil samples from 0-30 cm and 30-60 cm deep, the leaf and fruit samples were collected. The greatest proportion of total soil boron is present in residual form (85-88%). It is followed by organically bound B (2.84-4.50%), specifically adsorbed on soil colloid surfaces (0.93-1.31%), oxides (manganese oxyhydroxides, amorphous Fe and Al oxides, crystalline Fe and Al oxides) bound B (7.27-8.31%). The smallest one readily soluble (extracting plant available) boron values were composed of only 0.40-0.50% of total boron ranging. To determine readily soluble boron five different extraction solutions were in the order Hot water > 0.01 M CaCl2 > 1 M NH4OAc > 0.1 M KCl > 0.005 M DTPA. Fruit boron concentration and soil boron fractions showed close correlations than leaf boron concentration.