نتایج جستجو برای: K release

تعداد نتایج: 583085  

ژورنال: علوم آب و خاک 2014
ادهمی, ابراهیم , اولیایی, حمیدرضا , حیدرماه, صفورا , نجفی قیری, مهدی ,

Rate of nonexchangeable K release can significantly influence K availability. Kinetics of K+ release was studied by extraction using 0.01 M CaCl2 in 12 surface calcareous soils of Kohgilouye Province. Results showed that cumulative K release ranged from 89.9 to 460.9 mg kg-1(Average 195.4 mg kg-1). Calcium carbonate, nonexchangeable K, cation exchange capacity and mica showed a significant corr...

Journal: :تحقیقات آب و خاک ایران 0
سمیرا نوروزی کارشناس ارشد دانشگاه صنعتی اصفهان حسین خادمی استاد، دانشگاه صنعتی اصفهان lمهران شیروانی استادیار، دانشگاه صنعتی اصفهان

the release rate of potassium (k) from micaceous minerals plays a significant role in supplying k to plants. the objective of this study was to determine the most appropriate kinetic equation to describe potassium release from micaceous minerals as influenced by organic acids. muscovite and phlogopite were made to react with 0, 500, 2000 and 4000 ?m solutions of oxalic, citric and malic acids f...

Journal: :تحقیقات آب و خاک ایران 0
کریم شهبازی کامبیز بازرگان

nonexchangeable soil-k release rate can significantly affect k dynamics and it's bioavailability during plant growth. in this study, twelve soil samples taken from different wheat cropping regions of iran were incubated with nabph4 to (i) investigate the kinetics of nonexchangeable k release and (ii) to compare the ability of various kinetic equations (zero-, first- and second-order, parab...

Journal: :iranian journal of pharmaceutical sciences 0
harun-or- rashid department of pharmaceutical technology, university of dhaka, dhaka, bangladesh abul kalam lutful kabir department of pharmacy, stamford university bangladesh, dhaka - 1217 md. zakir hossaina department of pharmaceutical technology, university of dhaka, dhaka, bangladesh abu shara shamsur rouf department of pharmaceutical technology, university of dhaka, dhaka, bangladesh

the purpose of this work was to develop once daily sustained release (sr) matrix tablets of naproxen, an anti-inflammatory agent. the tablets were prepared by wet granulation method along with hydrophilic matrix materials like methocel k 15m cr and methocel k 100m cr. the granules were evaluated for bulk density, angle of repose, compressibility index, total porosity and drug content. the table...

ژورنال: علوم آب و خاک 2014
حاتمی, حدیث, خادمی, حسین, فتوت, امیر, کریمی, علیرضا,

Organic acids play an important role in improving the bioavailability of soil nutrients. The objectives of this study were to determine the effect of oxalic acid on the release of soluble, exchangeable and non-exchangeable forms of K from micaceous minerals and potassium feldspars, and also to investigate the trend of K release by time. A laboratory study was carried out using a completely rand...

ژورنال: علوم آب و خاک 2010
حسینی فرد, سید جواد , کلباسی, محمود, خادمی, حسین ,

This study was conducted to determine the effect of 3 extractants on K release from biotite, phlogopite and muscovite. The minerals were grouped to <60 and 60-100 µm size classes. Particles CEC were saturated with calcium. Sequential extraction up to 30 times was carried out using 0.01M HCl, 1M NH4OAc and 0.05M BaCl2 solutions and cumulative concentration of K was calculated for each extractant...

Abu Shara Shamsur Rouf Abul Kalam Lutful Kabir, Harun-Or- Rashid Md. Zakir Hossaina

     The purpose of this work was to develop once daily sustained release (SR) matrix tablets of naproxen, an anti-inflammatory agent. The tablets were prepared by wet granulation method along with hydrophilic matrix materials like Methocel K 15M CR and Methocel K 100M CR. The granules were evaluated for bulk density, angle of repose, compressibility index, total porosity and drug content. The ...

H. R. Owliaie M. Najafi-Ghiri

Zeolite application to clayey soils may change potassium (K) pools distribution and its release rate. To test this hypothesis, two heavy-textured calcareous soils with different mineralogy (smectitic and mixed by XRD) from southern Iran were selected. Experiment was a completely randomized factorial arrangement. Treatments consisted of two soils and two zeolite levels (0 and 5%) and wetting-dry...

ژورنال: علوم آب و خاک 2015
ابطحی, سید‌علی , اولیایی, حمیدرضا , باقرنژاد , مجید , شاکری, سیروس , کریمیان , نجفعلی ,

The aim of this study was to assess the kinetics of nonexcheangable potassium release in surface and subsurface soil horizons, using organic and inorganic extractions, in Kohgilouye-va-Boyerahmad Province. Kinetics of K+ release was studied by successive extractions of K from 64 selective surface and subsurface soil samples, using 0.01 M CaCl2 and 0.01 M oxalic acid, for 1948 h, with two replic...

ژورنال: علوم آب و خاک 2014

In Iran, no research has yet been performed on potassium release from feldspar in comparison with that from muscovite. The objective of this research was to compare potassium release kinetics of these minerals as influenced by organic and inorganic extractants using successive extraction method. The experiment was carried out in a completely randomized design with a factorial combination. Treat...

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