نتایج جستجو برای: sodium adsorption ratio (sar)

تعداد نتایج: 742898  

Journal: :iranian journal of environmental sciences 0
mashura shammi dept. of environmental sciences jahangirnagar university bikash karmakar department of environmental sciences, jahangirnagar university, dhaka, bangladesh md. mostafizur rahman department of environmental sciences, jahangirnagar university, dhaka, bangladesh faculty of environmental earth science, graduate school of environmental science, hokkaido university, sapporo, japan md saiful islam department of environmental biology and chemistry, graduate school of science and engineering for research, university of toyama, gofuku 3190, toyama 930-8555, japan. rashadur rahaman dept of environmental sciences, jahangirnagar university, savar dhaka bangladesh khabir uddin department of environmental sciences, jahangirnagar university, dhaka, bangladesh

batiaghata upazila, khulna district in south-west coastal region of bangladesh is the mostly saline affected area, where agriculture activities are mainly dependent on rainfall. 23 water samples from surface water and shallow tube well (stw) were collected in the monsoon season and analyzed for physico-chemical properties to classify them according to salinity hazard. electrical conductivity (e...

2012
Hamid Ahmadi

Groundwater is one of earth’s most vital renewable and widely distributed resources as well as an important source of water supply worldwide. The increased exploitation of groundwater resources can decrease regional water quality as a whole. The estimation of sodium adsorption ratio (SAR) and chloride content, and also, Na, Ca and Mg concentration are much more timeconsuming and expensive than ...

Journal: :مدیریت آب و آبیاری 0
فاطمه ساسانی دانشجوی دکتری آبیاری و زهکشی، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران هوشنگ قمرنیا استاد گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه، ایران بهمن یارقلی استادیار موسسه تحقیقات فنی و مهندسی کشاورزی

in this study, the effects of long term use of urban wastewater (over 40 years) on soil salt content and related parameters were evaluated in the lands south of tehran. for this analysis, kriging methods were tested. according to the suitable model indices, ordinary kriging (ok) was suitable for ph, clay, na+, mg2+ and sodium adsorption ratio (sar) interpolation; log-normal kriging (log-normal ...

Journal: :پژوهش های خاک 0
مجتبی مقبلی دانشجوی کارشناسی ارشد علوم خاک دانشگاه تهران محسن فرحبخش استادیار گروه علوم خاک دانشگاه تهران ناصر برومند استادیار گروه خاکشناسی دانشگاه جیرفت

boron (b) is an important plant essential micronutrient whose availability is influenced by many soil factors. adsorption–desorption processes play a major role in governing the solubility of boron in soil solution and, consequently, its availability to growing plants. to assess the effect of sodium adsorption ratio (sar) on availability of b, adsorption of b was investigated in a sampled calca...

Journal: :آب و خاک 0
مجتبی مقبلی محسن فرحبخش ناصر برومند

introduction: boron (b) is an essential plant micronutrient whose soil availability is influenced by many soil factors.understanding the processes controling activity of boron (b) in the soil solution is important for soil fertility management. the reaction of adsorption and desorption of boron in soil determines the amount of boron that is available to plants. adsorption–desorption processes p...

2002
D. L. SUAREZ

The relation between the sodium adsorption ratio (SAR) and pHc derived here predicts SAR of the drainage water (SARdw) better than existing empirical equations. Inaccuracies in SAR estimates from the new relationship can be anticipated by the extent to which the derived conditions are valid. Empirical equations provide no understanding of why they are sometimes inaccurate. Due to the relative i...

2009
S. M. Lesch D. L. Suarez Scott M. Lesch

A simple algebraic technique is presented for computing the adjusted sodium adsorption ratio (SAR) index. The statistical formula presented in this note facilitates the computation of the adjusted SAR without the use of a look‐up table, custom computer software, or the need to compute exact individual ion activity coefficients and complexes. A short data analysis example is also presented that ...

2010
Robert A. Patterson

Septic tank effluent is inherently high in sodium ions relative to divalent cations (high sodium adsorption ratio). The disposal of septic tank effluent to the soil will cause the sodium ions to disperse the clay colloids, resulting in a physical blocking of the soil pores. Hydraulic conductivity will be reduced and the effluent will fail to dissipate into the soil profile. In designing the dis...

Journal: :journal of research in health sciences 0
safar marofi ahmad joneidi jafari

background: in this study, the chemical quality of water in some sub-basins of gamasiab river has been investigated for a long term planning of water consuming in the region . methods: the area is about 11 x10 3 km 2 , located in ramadan and kermanshah, the two western regions of iran. in this regard the results of the water samples, which were collected on the outlet of the 13 hydrometrical st...

Journal: :international journal of advanced biological and biomedical research 2014
mahdi zare korosh ordookhani abouzar emadi arash azarpanah

objective: soil salinity is one of the major worldwide environmental constraints affecting agricultural production in arid and semiarid regions. lack of proper management of water and soil resources lead to increase soil salinity and reduce soil fertility. on the other hand, it seems simple and cheap method of measuring soil salinity is necessary. the aim of this study was to determine the rela...

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