List of Articles Soil physical and chemical properties

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  1 - Laboratory Evaluation the Organic Amender’s Effect on the Leaching Process of Saline- Sodic Soils
  MOHAMMADREZA DALAIAN FATEMEH ZABIHI samira sarbazrashid
  10.30495/wsrcj.2021.19210
  Background and Aim: Soil salinity and alkalinity are one of the most important destructive soil processes, especially in arid and semi-arid regions. Sodium soils are faced with degradation of soil structure, reduction of permeability and speed of water movement in the s More

  Background and Aim: Soil salinity and alkalinity are one of the most important destructive soil processes, especially in arid and semi-arid regions. Sodium soils are faced with degradation of soil structure, reduction of permeability and speed of water movement in the soil, runoff increasing, decrease of land use, ventilation decreasing, and finally, decrease of crop yield. Many researches have been conducted based on physical, chemical, and biological methods to improve the saline and sodic soils, but the hybrid method is the most effective in the improvement of these soils. In this study, the effect of two organic amenders (Potassium Humate and Chicken Feather-CF) with leaching in improving some physical and chemical properties of saline and sodic soils has been investigated.Method: In this research, a factorial experiment in a completely randomized design with 16 treatments and 3 replications was conducted. The first factor was the type of amender (Potassium Humate and Chicken Feather), the second factor was the amount of amender (0.75 and 1.5 Weight percentage) and the third factor was leaching levels (no leaching, 45, 90, and 135 days of incubation). After sampling from depth 0 to 30 cm and measuring some physical and chemical properties of the soil samples, the amenders are mixed with the soil and the soil moisture content was delivered to the field capacity (0.7-0.8 FC). Then the soil samples were poured into the columns. Soil columns were leached at three intervals of 1.5 months with the amount of one pore volume (P.V). At each leaching stage, the properties such as soil acidity (pH), electrical conductivity (ECe) and sodium adsorption ratio (SAR) in drainage water (DW) and pH, EC, SAR, cation exchange capacity (CEC), exchangeable sodium percentage (ESP), wet aggregate stability (WAS), organic carbon (OC) and hydraulic saturation conductivity (Ks) were measured in soil columns. Statistical analyzes and the comparison of means were performed by LSD test and using SPSS17 software. The graphs were drawn with EXCEL software.Results: The results showed that Potassium Humate reduced the pH of the soil and increased the pH of DW. This effect was more as the amender’s weight and leaching increased. Also, Potassium Humate reduced the ECe of soil and this effect was more as the leaching increased. The findings showed that the high amount of amenders led to the high SAR in DW. As the leaching stage increased, the SAR of soil decreased in both amenders. The 1.5% of amenders amount had more effect on the reduction of SAR than the level of 0.75% in both amenders. With increasing leaching, the CEC of soil decreased. The highest CEC (31.2 cmolc.kg-1) was obtained in the CF with 1.5% of the amender’s amount. When the number of amenders increased, the CEC of soil increased. Also, when the leaching and the amount of CF increased, the ESP of soil decreased.The results showed that with increasing the leaching in Potassium Humate, the % OC of soil decreased. The WAS increased with increasing the amount of CF. The highest amount of WAS was in CF (1.5%). Potassium Humate in high amounts (1.5 %) reduced Ks. Ks decreased with increasing leaching from the second leaching stage onwards.Conclusion: In general, it can be concluded that the addition of amenders increases the pH and SAR in the DW and decreases the pH (from 8.24 to 7.39), ECe (from 17.07 to 0.8 dS.m-1) and SAR (from 19.34 to 11.1 (cmolc.l-1)0.5) in the soil. Leaching increased pH and ECe in DW and decreased CEC, ESP in soil and decreased KS by increasing leaching stages after the second leaching stage. Potassium Humate reduced OC%, KS and Chicken Feather increased CEC and WAS and decreased ESP in soil. In general, Chicken Feather (with 0.75%) along with leaching is recommended to modify the saline and sodic soils. Manuscript profile
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  2 - Effect of Land Use Change from Forest to Agriculture and Abounded of Agriculture on Soil Physical and Chemical Properties in Zagros Forest Ecosystem
  Masoud Bazgir Mehdi Hydari Nasim Zeynali Mehrdad Kohzadean
  10.30495/jest.2020.26084.3506
  Background and Objective: Deforestation and land use change of forests into simple ecosystems is as a global concerning and this problem also increases in Asia during the 20th century.This study aimed to study effect of land use change from forest to agriculture and abo More

  Background and Objective: Deforestation and land use change of forests into simple ecosystems is as a global concerning and this problem also increases in Asia during the 20th century.This study aimed to study effect of land use change from forest to agriculture and abounded of agriculture on soil physical and chemical properties in Zagros forest ecosystem.Method: We consider similar conditions in terms of physiography by maximum different height in150 m and distancing less than 3 km including undisturbed forest (control), Long-term abounded of agriculture and continues agriculture.Findings: The results of one-way ANOVA showed that all soil physical and chemical properties had significant differences among different land uses. The highest amount of organic carbon, nitrogen, phosphorus and potassium found in control and agricultural abounded. According to PCA analysis, control and Long-term abounded of agriculture land uses were strongly correlated with the same direction of the first and second axis. This means that soil attributes in these land uses were similar.Discussion and Conclusion: Results showed that change in land use from Zagros forest into agriculture had distinguished negative effecton soil physical and chemical properties.By doing long-term protection on degraded soil because of land use change can improve soil properties like forest soils conditions. The monitoring of applied management such as conservation management on soil properties according to the distance of plots studied using principal components analysis is possible. Manuscript profile
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  3 - Parent Material Impact on the Geochemical Characteristics of Heavy Metals in Some Important Geological Formations in Zanjan Province
  Ali Afshari hossin Khademi
  Concentrations of heavy metals in soil depending on the parent material and the pedogenic and geochemical processes affect the distribution. This study aimed to determine the concentration and distribution of some heavy metals in soil geochemical distribution derived fr More

  Concentrations of heavy metals in soil depending on the parent material and the pedogenic and geochemical processes affect the distribution. This study aimed to determine the concentration and distribution of some heavy metals in soil geochemical distribution derived from different parent materials in the major geological formations in Zanjan province. For this purpose, number of 67 samples of surface soils from different parent materials, which includes 19 samples igneous parent materials (soils with parent material andesite, basalt, granite, volcanic tuff), 17 soil with sediment parent materials (soil parent material with shale and sandstone) and 31 samples from alluvial deposits were taken. According to the results, the highest mean Cu (38.6), Zn (191.7) and Pb (85.5) in the alluvial parent material, Cr (31.5) and Ni (66) in soils with shale parent material, manganese in soils with granite parent material (674.4) and andesite (673.8) and iron in the soil parent material andesite with (19800) and shale (18600) mg/kg were recorded. The total concentration of cobalt and cadmium in the soil parent material did not show substantial changes. Soil chemical fractionation of various metals was varied. Mobility factor for elements were obtained: Pb(29.8)>Co(25.1)>Ni(18.5)>Cu(6.2)>Zn(5.1). The highest levels of enrichment factor for elements Pb, Zn, Cd and Cu in alluvial parent materials, enrichment factor of nickel, cobalt and manganese in the soil parent material andesite and that for chromium and nickel in soil enriched with shale parent material was obtained. Geo-accumulation indicators showed the similar results. Manuscript profile