Full TGIF Record # 100997
Item 1 of 1
Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Woods, Micah S.; Ketterings, Q. M.; Rossi, F. S.
Author Affiliation:Cornell University, Ithica, New York
Title:Estimation of cation exchange capacity in sand rootzones
Meeting Info.:Seattle, WA: October 31-November4, 2004
Source:2004 Annual Meeting Abstracts [ASA/CSSA/SSSA/CSSS]. 2004, p. [1].
Publishing Information:[Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America
# of Pages:1
Keywords:TIC Keywords: Cation exchange capacity; Sand-based root zones; Soil testing; Analytical methods; Calcareous soils
Abstract/Contents:"Soil cation exchange capacity (CEC) can be measured using the time-consuming BaCl2 compulsive exchange method (CECCE). However, most commercial laboratories estimate the CEC through summation of the non-acid cations and exchangeable acidity determined by an agronomic soil test (CECSUM). Our objective was to evaluate the accuracy of such estimates for calcareous and non-calcareous sand rootzones. Twenty sands were analyzed for CECCE; for each sand CECSUM was calculated as the sum of non-acid cations extracted by Morgan, Mehlich 3, 1 N NH4OAc, 1:5 H2O, and 0.01 M SrCl2. Morgan, Mehlich 3, and 1 N NH4OAc extractions dissolved carbonate minerals and consequently CECSUM based on these methods greatly overestimated CECCE in calcareous sands. The CECSUM of non-calcareous sands based on Morgan, Mehlich 3, and 1 N NH4OAc extractions was also greater than CECCE. The CECSUM based on the 1:5 H2O extraction method underestimated CECCE. The CECSUM calculated from the 0.01 M SrCl2 extractable cations was highly correlated with CECCE (r2=0.90) for both calcareous and non-calcareous sands included in the study. More accurate estimates were obtained by subtracting water-soluble non-acid cations from 0.01 M SrCl2 extractable non-acid cations (r2=0.93). We conclude that for sand rootzones, the 0.01 M SrCl2 extraction can be used to rapidly obtain accurate estimates of CECCE."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Woods, M. S., Q. M. Ketterings, and F. S. Rossi. 2004. Estimation of cation exchange capacity in sand rootzones. Annu. Meet. Abstr. p. [1].
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