Use of Diffusion to Determine Soil Cation-Exchange Capacity by Ammonium Saturation

2004 ◽  
Vol 35 (1-2) ◽  
pp. 51-67 ◽  
Author(s):  
R. L. Mulvaney ◽  
S. A. Yaremych ◽  
S. A. Khan ◽  
J. M. Swiader ◽  
B. P. Horgan
2017 ◽  
Vol 135 ◽  
pp. 242-251 ◽  
Author(s):  
Jalal Shiri ◽  
Ali Keshavarzi ◽  
Ozgur Kisi ◽  
Ursula Iturraran-Viveros ◽  
Ali Bagherzadeh ◽  
...  

1971 ◽  
Vol 51 (3) ◽  
pp. 405-410
Author(s):  
A. K. Ballantyne

Leaching a silt loam soil (cation exchange capacity 23 meq/100 g) with water containing increasing rates of potassium dust (KCl) indicated that high levels adversely affected germination and yields of wheat as well as response to fertilizer. Germination was greatly reduced by the treatment with 22.4 metric tons per hectare and nearly eliminated by 44.8 tons. The 44.8-ton/ha treatment also greatly reduced the yield of grain, but straw weights were affected very little by increasing rates of potassium dust. Response to fertilizer was also reduced by 22.4 and 44.8 tons. The exchangeable Ca and Mg decreased and K increased as increasing amounts of K dust were leached through the soil. The 44.8-ton treatment decreased the exchangeable Ca from 56.0 to 24.9% and the Mg from 21.2 to 4.9%, and increased the K from 7.2 to 51.9%. It would appear that K salts can be added to the soil, without any adverse effects, until the exchangeable K is increased to about 30%. With the soil under study this took more than 11.2 tons per ha (5 short tons/acre). The application of dolomite ameliorated the effect of excess K.


CATENA ◽  
2017 ◽  
Vol 158 ◽  
pp. 194-200 ◽  
Author(s):  
Yones Khaledian ◽  
Eric C. Brevik ◽  
Paulo Pereira ◽  
Artemi Cerdà ◽  
Mohammed A. Fattah ◽  
...  

1970 ◽  
Vol 75 (2) ◽  
pp. 365-367 ◽  
Author(s):  
T. M. Addiscott

Two methods have been used previously to resolve the ‘mineral’ and ‘organic’ fractions of the cation exchange capacities of soils. Williams (1932) and Hallsworth & Wilkinson (1958) used multiple regression analysis to relate cation exchange capacity (CEC) in several soils to percentage organic matter (OM) and percentage clay, and thence to calculate the average values of the CECs of OM and clay. For individual soils, Davies & Davies (1965) and Clark & Nichol (1968) measured the CEC before and after oxidizing the OM with hydrogen peroxide.


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