Release Kinetics of Nonexchangeable Potassium in Calcareous Soils

2005 ◽  
Vol 36 (13-14) ◽  
pp. 1903-1917 ◽  
Author(s):  
Mohsen Jalali
Keyword(s):  
Release Kinetics ◽  
Calcareous Soils ◽  
Kinetics Of ◽  
Nonexchangeable Potassium

scholarly journals   Copper release kinetics: Effect of two extractants and wheat (Triticum aestivum L.) rhizosphere

2012 ◽  
Vol 58 (No. 10) ◽  
pp. 471-476 ◽  
Author(s):  
H.R. Motaghian ◽  
A.R. Hosseinpur
Keyword(s):  
Citric Acid ◽  
Release Kinetics ◽  
Calcareous Soils ◽  
Triticum Aestivum L ◽  
First Order ◽  
Rhizosphere Soils ◽  
Copper Release ◽  
Successive Extraction ◽  
The Mean ◽  
Kinetics Of

The greenhouse experiment was performed to determine Cu release characteristics in the bulk and the rhizosphere of some calcareous soils using rhizobox. The kinetics of Cu release in the bulk and the rhizosphere soils were determined by successive extraction with diethylenetriaminepentaacetic acid-triethanolamine (DTPA-TEA) and 10 mmol/L citric acid in a period of 1 to 504 h at 25 ± 1°C. The results of kinetics study showed that Cu extracted using DTPA-TEA in the rhizosphere soils was significantly (P < 0.01) lower than the bulk soils, while Cu extracted using citric acid in the rhizosphere soils was significantly (P < 0.01) higher than the bulk soils. The mean of released Cu after 504 h using DTPA-TEA were 8.59 and 7.46 mg/kg in the bulk and the rhizosphere soils, respectively. The mean release of Cu after 504 h using citric acid was 14.73 and 16.05 mg/kg in the bulk and the rhizosphere soils, respectively. Release kinetics of Cu in two extractants conformed fairly well to parabolic diffusion, power function, and first order equations. The results of correlation analysis illustrated that a significant correlation between Cu desorption after 504 h with citric acid and Cu concentration in wheat was found (r = 0.96 and r = 0.90 in the rhizosphere and the bulk soils, respectively, P < 0.01). Therefore, application of 10 mmol/L citric acid extractant would be recommended in the future study on the kinetics of release of Cu in calcareous soils.  

scholarly journals   Potassium release kinetics and its correlation with pinto bean (Phaseolus vulgaris) plant indices

2012 ◽  
Vol 58 (No. 7) ◽  
pp. 328-333 ◽  
Author(s):  
A.R. Hosseinpur ◽  
H.R. Motaghian ◽  
M.H. Salehi
Keyword(s):  
Release Kinetics ◽  
Calcareous Soils ◽  
Bean Plant ◽  
Pinto Bean ◽  
Successive Extraction ◽  
Release Studies ◽  
Function Models ◽  
Kinetics Of ◽  
Total Reaction Time ◽  
K Release

The rate of potassium (K) release from soils is a dynamic process, and it is important to the evaluation of soil K availability to plant. The objectives of this study were to determine K release characteristics and the correlation of these parameters with bean plant indices in surface soils of 15 calcareous soils. The kinetics of K release was determined by successive extraction with 0.01 mol/L CaCl<sub>2</sub> in a period of 2&ndash;2017 h at 25 &plusmn; 1&deg;C. The results showed that the cumulative K&rlm; release ranged from 111 to 411 mg/kg. A plot of cumulative amount of K released showed a discontinuity in slope at 168 h. Thus, two equations were applied to segments of the total reaction time (2 to 168 and 168 to 2017 h). The amounts of K released during 2&ndash;168 and 168&ndash;2017 h ranged from 55 to 299 and 44 to 119 mg/kg, respectively. Release kinetics of K conformed fairly well to parabolic diffusion, simplified Elovich and power function models in two segments. Potassium released after 2&ndash;168 and 168&ndash;2017 h and K release rate constants were significantly correlated (P &lt; 0.05) with bean plant indices, while correlation between K extracted by using 1 mol/L NH<sub>4</sub>OAc (ammonium acetate) and plant indices was not significant. The results of this research showed that information obtained from K release studies in laboratory and kinetics equation parameters can help to estimate the K supplying power of soils. &nbsp;

Release Kinetics of Nonexchangeable Potassium by Different Extractants from Soils of Varying Mineralogy and Depth

2006 ◽  
Vol 37 (3-4) ◽  
pp. 473-491 ◽  
Author(s):  
Ch. Srinivasarao ◽  
T. R. Rupa ◽  
A. Subba Rao ◽  
G. Ramesh ◽  
S. K. Bansal
Keyword(s):  
Release Kinetics ◽  
Kinetics Of ◽  
Nonexchangeable Potassium

Analysis of K+ release kinetics of biomass ash with different pH

2014 ◽  
Vol 22 (2) ◽  
pp. 171-176
Author(s):  
Kan WANG ◽  
Zifang WANG ◽  
Ming GAO ◽  
Yaohua HUANG ◽  
Xiaofei HAN ◽  
...  
Keyword(s):  
Release Kinetics ◽  
Biomass Ash ◽  
Kinetics Of ◽  
K Release

scholarly journals Design and release kinetics of liposomes containing abiraterone acetate for treatment of prostate cancer

2021 ◽  
Vol 2 ◽  
pp. 100077
Author(s):  
Sudipta Das ◽  
Arnab Samanta ◽  
Shouvik Mondal ◽  
Debatri Roy ◽  
Amit Kumar Nayak
Keyword(s):  
Prostate Cancer ◽  
Release Kinetics ◽  
Abiraterone Acetate ◽  
Kinetics Of

scholarly journals Risk Assessment of Agricultural Plastic Films Based on Release Kinetics of Phthalate Acid Esters

2021 ◽  
Vol 55 (6) ◽  
pp. 3676-3685
Author(s):  
Yu Wang ◽  
Fang Wang ◽  
Leilei Xiang ◽  
Chenggang Gu ◽  
Marc Redmile-Gordon ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Release Kinetics ◽  
Plastic Films ◽  
Kinetics Of ◽  
Acid Esters ◽  
Phthalate Acid Esters
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