نتایج جستجو برای: soil cation exchange capacity
تعداد نتایج: 677170 فیلتر نتایج به سال:
در سالهای اخیر نانوکامپوزیت ها به دلیل اثر نانوذرات موجود در آنها از طریق برهمکنشهای داخلی بر بهبود خواص در مقایسه با مواد دیگر مورد توجه قرار گرفته اند. نانوکامپوزیت های شامل پلیمر و سیلیکات های لایه ای گروه جدیدی از مواد هستند که خواص مکانیکی و عبورپذیری آنها بهبود یافته است. نانوکامپوزیت های پلیمر- خاک رس، که از دو فاز ماتریس پلیمری و عامل تقویت کننده تشکیل می شوند، به دلیل سهولت فرایند تولی...
Mozambique includes 10 agroecological zones with distinct climate and cropping systems (INIA, 1980). Agricultural production is more intensively practiced in the central and northern parts of the country where agroecological conditions are favorable. As a result of 16 years of civil war and low funding for agricultural research few assessments of soil nutrient status have been possible. To asse...
in order to study the effects of climate and geomorphology on the development of soils and their physico-chemical peroperties, two transects on the loess parent material were selected in two regions of golestanprovince. the regions were: huttan (maraveh tappeh area) and gorgan with aridic-thermic and xeric-thermic soil moisture and temperature regimes, respectively. four pedons in hutan and fiv...
Concentration of soluble fluoride in groundwater, soil, and some crops in Isfahan region was determined by Ion Selective Electrode (ISE) method. The mean fluoride concentration of water samples in the study area was 0.3 and 0.05 mg L-1 in the spring and summer, respectively. These values are in an acceptable limit for irrigation, whereas for drinking water, they are in deficiency range. The ave...
Cation exchange capacity (CEC) is one of the most important chemical characteristics which influences soil quality from different aspects. At the same time, CEC is an input parameter of many computer models being applied in soil science and agriculture. Methods of CEC determination are always time-consuming and laborious. Therefore, developing a model for CEC estimation from other soil properti...
Increasing urbanisation and industrialisation have led to a dramatic reduction in forest area, and now only culturally protected remnants of natural forests and some new plantations remain in most areas of the north of Iran. To investigate the status of the chemical and physical characteristics of soil under these remnant forests and assess the possible impacts of reforestation on soil properti...
Potassium (K) is an important cation in saline soils of arid lands, and its content, distribution and availability may be affected by native plants. To study the effect of halophyte species on different K forms in Korsia region located in western Darab (Fars province), three dominant halophyte species including Juncus gerardi, Halocnemum strobilaceum, and Salsola rigida were selected. Sampling ...
[1] Predicting the transport of reactive chemicals in subsurface porous media requires accurate adsorption models. This study compares the ability of various cation exchange models to quantitatively capture the transport behavior of major cations (i.e., calcium and sodium) in soil laboratory columns over a wide range of pore water composition. Experimental breakthrough curves were compared with...
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