The cation exchange capacity of plant roots, and its relationship to the uptake of insoluble nutrients

1961 ◽  
Vol 12 (5) ◽  
pp. 755 ◽  
Author(s):  
CJ Asher ◽  
PG Ozanne
Keyword(s):  
Cation Exchange ◽  
Plant Species ◽  
Cation Exchange Capacity ◽  
Rock Phosphate ◽  
Root Systems ◽  
Exchange Capacity ◽  
Nitrogen Supply ◽  
Plant Roots ◽  
Rapid Technique ◽  
Calcium And Phosphorus

The cation exchange capacity (C.E.C.) of the roots of 20 plant species was measured by a rapid technique not involving toxic reagents or harmful temperatures. Significant differences between the root C.E.C. of various species were found, and with three exceptions, legumes > herbs > grasses. Nitrogen supply had little effect on the legumes and herbs, but significantly increased the C.E.C. of two grasses. The concentrations of calcium and phosphorus in the tops of plants utilizing rock phosphate were each positively correlated with root C.E.C. The concentration of phosphorus was not greater in the tops of plants with relatively large root systems.

scholarly journals Cation Exchange Capacity and Base Saturation Variation among Alberta, Canada, Moss Peats

HortScience ◽  
2007 ◽  
Vol 42 (2) ◽  
pp. 349-352 ◽  
Author(s):  
Janet F.M. Rippy ◽  
Paul V. Nelson
Keyword(s):  
Species Composition ◽  
Cation Exchange ◽  
Plant Species ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Buffering Capacity ◽  
Base Saturation ◽  
Plant Species Composition ◽  
Sphagnum Fuscum ◽  
Initial Ph

Variations in moss peat cation exchange capacity (CEC) and base saturation (BS) can result in inconsistent initial pH in moss peat-based substrates created using standard formulas for limestone additions and can lead to subsequent drift from the initial pH in those substrates. This study was conducted to determine the extent of such variation. CEC and BS were measured in three replications on 64 moss peat samples that were selected from three mires across Alberta, Canada, to represent maximum gradients in plant species composition within six degrees of decomposition acceptable for professional peat-based substrates. CEC ranged from 108 to 162 cmol·kg−1 (meq·100 g). Averaged overall samples, BS ranged from 15% to 71% of CEC and calcium accounted for 68%, magnesium for 25%, sodium for 5%, and potassium for 1.4% of BS. CEC was positively correlated to the amount of Sphagnum fuscum (Schimp.) Klingrr. in the sample (r = 0.22). BS was positively correlated to the amount of sedge (r = 0.28). Neither CEC nor BS was influenced by degree of decomposition (r = 0.002 and r = 0.08, respectively). Moss peats with high CEC have a greater buffering capacity than those with low CEC, resulting in less pH drift. Moss peats with high BS should have a low neutralization requirement to achieve a target pH. Understanding the species composition in peat-based substrates can alleviate problems of inconsistent initial pH and subsequent pH drift.

CATION-EXCHANGE CAPACITY OF PLANT ROOTS

Soil Science ◽  
1951 ◽  
Vol 72 (2) ◽  
pp. 139-148 ◽  
Author(s):  
MACK DRAKE ◽  
JONAS VENGRIS ◽  
WILLIAM G. COLBY
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Plant Roots

Cation-anion relationships in crop nutrition: III. Relationships between the ratios of sum of the cations: sum of the anions and nitrogen concentrations in several plant species

1964 ◽  
Vol 63 (1) ◽  
pp. 109-111 ◽  
Author(s):  
R. K. Cunningham
Keyword(s):  
Cation Exchange ◽  
Plant Species ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
B Values ◽  
Horticultural Crops ◽  
N Level ◽  
Rye Grass ◽  
Crop Nutrition ◽  
Nitrogen Concentrations

The ratios of sum of the cations: sum of the anions (R) of sixty-two agricultural and horticultural crops and pasture herbs were measured or calculated and found to be negatively correlated with % N in the plants. This suggests that the proposal that Italian rye-grass has a mechanism regulating the proportion of cations to anions taken up may also apply to other plant species. Dicotyledons had greater B values than monocotyledons at the same N level, but this is probably not because their roots have greater cation exchange capacity.

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