اثر مواد آلی خاک، هدایت الکتریکی و نسبت جذب سدیم بر مقاومت کششی خاک دانه ها
Authors
Abstract:
The general characteristics of salt-affected soils and soil structure degradation process are partially known, but the effects of saline and sodic conditions on mechanical properties of soils are not well recognized. In this study, the effects of electrical conductivity (EC) and sodium adsorption ratio (SAR) on tensile strength of soils with different organic carbon contents were assessed under laboratory conditions. The soil samples were collected from Dasht-E-Naz, at Sari region in the North of Iran. The samples had the same clay mineral (Illitic) and the main difference between them was the organic carbon content, subjected to different cropping systems. The tensile strength was determined on soil samples which had been treated by solutions having defined EC (0.5 and 4 dS/m) and SAR (0, 5, 15). The tensile strength was positively related to organic carbon content, but negatively to SAR. With increasing SAR, tensile strength decreased, and at a given SAR, the treatments with higher EC showed higher tensile strength. The analysis of variance showed significant differences (at 0.01) between soil samples (four levels), soil sampling depth (two levels), EC (two levels), and SAR (three levels) for all variables under investigation. For soil factor, the order of averages were: Virgin soil > Permanent pasture (Festuca) > Intensive cropping > Permanent pasture (Agropyron).
similar resources
اثر مواد آلی خاک، هدایت الکتریکی و نسبت جذب سدیم بر مقاومت کششی خاک دانه ها
ویژگی های خاک های متأثر از املاح و فرایند تخریب ساختمان خاک تا حدی شناخته شده، ولی اثر شرایط شور و سدیمی بر ویژگی های مکانیکی خاک ها، کمتر بررسی شده است. در این پژوهش، اثر هدایت الکتریکی (ec) و نسبت جذب سدیم (sar) بر مقاومت کششی خاک هایی که مقدار مواد آلی متفاوت دارند، در شرایط آزمایشگاهی بررسی گردیده است. نمونه های خاک از منطقه دشت ناز ساری تهیه شده و دارای نوع رس یکسان (با کانی غالب ایلایت) ه...
full textاثر مواد آلی بر خواص شیمیایی خاک، جذب عناصر به وسیله ذرت و عملکرد آن
Due to high production of organic residues such as sewage sludge and compost, land application is probably the best way to prevent accumulated residues in the environment. However, the risk involved in the land application of organic residues should be evaluated prior to the assessment of their economic and fertilizer values. The objective of this study was to evaluate the effect of organic res...
full textاثر مواد آلی بر خواص شیمیایی خاک، جذب عناصر به وسیله ذرت و عملکرد آن
Due to high production of organic residues such as sewage sludge and compost, land application is probably the best way to prevent accumulated residues in the environment. However, the risk involved in the land application of organic residues should be evaluated prior to the assessment of their economic and fertilizer values. The objective of this study was to evaluate the effect of organic res...
full textتأثیر شرایط آزمایش، مقدار ماده آلی، رس و کربنات کلسیم خاک بر میانگین وزنی قطر و مقاومت کششی خاکدانه ها در برخی از خاک های استان همدان
Soil physical and chemical properties, and test conditions might affect soil structural stability. In this study, the effects of test conditions as well as intrinsic soil properties on structural stability were investigated for selected soils from Hamedan Province. Mean weight diameter (MWD) and tensile strength (Y) of aggregates were determined by wet sieving method and indirect Brazilian test...
full textMy Resources
Journal title
volume 6 issue 3
pages 151- 161
publication date 2002-10
By following a journal you will be notified via email when a new issue of this journal is published.
No Keywords
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023