Collaborative Study of the Cation Exchange Capacity of Peat Materials

Thorpe, Virginia A

doi:10.1093/jaoac/56.1.154

Cited by 28 publications

(21 citation statements)

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“…v Bulk density after forced-air drying at 105°C for 48 h; 1 gÁcm -3 = 0.5780 oz/inch 3 . u Cation exchange capacity determined by A&L Eastern Agricultural Laboratories (Richmond, VA) using the AOAC International Official Method (Thrope, 1973). t Means were separated within column between pine bark and pine tree substrate by least significance difference at P # 0.05. s Pine tree substrate produced from 12-year-old loblolly pine trees harvested at ground level, delimbed, chipped, and hammer milled to pass through a 6.35-mm screen.…”

Section: Resultsmentioning

confidence: 99%

“…Physical properties including air space, container capacity, total porosity, and bulk density were determined on three replicate samples of each substrate at the beginning of the experiment using the North Carolina State University Porometer method as described by Fonteno et al (1995). Cation exchange capacity (CEC) was determined by A & L Eastern Laboratories (Richmond, VA) using the AOAC International Official Method (Thrope, 1973).…”

Section: Methodsmentioning

confidence: 99%

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Effect of Fertilizer Rate on Growth of Azalea and Holly in Pine Bark and Pine Tree Substrates

Jackson¹,

Wright²,

Browder³

et al. 2008

horts

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Recent interest in the use of wood substrates in horticulture crop production has justified the need for determining fertilizer requirements in these substrates compared with traditional pine bark (PB) and peatmoss substrates. The objective was to determine the response of japanese holly (Ilex crenata Thunb. ‘Compacta’) and azalea (Rhododendron obtusum Planck. ‘Delaware Valley’) grown in a pine tree substrate (PTS) (trade name WoodGro™) or milled PB to fertilizer rate. Pine tree substrate is produced from freshly harvested loblolly pine trees (Pinus taeda L.) that are delimbed, chipped, and ground in a hammer mill to a desired particle size. Japanese holly plants were grown in 2.8-L containers in the fall of 2005 and again in the spring of 2007 with the addition of azalea. Plants grown in PTS or PB were fertilized by incorporating Osmocote Plus fertilizer (15N–3.9P–10K) at rates of 3.5, 5.9, 8.3 or 10.6 kg·m−3 for japanese holly and 1.2, 3.5, 5.9, or 8.3 kg·m−3 for azalea. After 3 months, shoot dry weights were determined for japanese holly and azalea. Japanese holly root dry weights were determined for both experiments, and substrate CO2 efflux (μmol CO2 m−2·s−1) was measured on the treatments at the end of the experiment using a LI-6400 soil CO2 flux chamber. In 2005, japanese holly shoot dry weights of PTS-grown plants were comparable to plants grown in PB at the 8.3 kg·m−3 fertility rate, and shoot dry weights of PTS-grown plants were higher than PB at the 10.6 kg·m−3 rate. In 2007, japanese holly and azalea shoot dry weights of PTS-grown plants were comparable to PB plants at the 5.9 kg·m−3 fertilizer rate. Both japanese holly and azalea achieved shoot growth in PTS comparable to shoot growth in PB with ≈2.4 kg·m−3 additional fertilizer for PTS. Substrate CO2 efflux rates were higher in PTS compared with PB indicating higher microbial activity, thereby increasing the potential for nutrient immobilization in PTS.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of Fertilizer Rate on Growth of Azalea and Holly in Pine Bark and Pine Tree Substrates

Jackson¹,

Wright²,

Browder³

et al. 2008

horts

View full text Add to dashboard Cite

show abstract

“…Three samples were randomly chosen from each of the aforementioned 64 to comprise three replications. Cation exchange capacity was measured on %2 g of air-dry, ground moss peat in a complete random design using a protocol described by Thorpe (1973). In this procedure, moss peat was soaked in 100 mL half-normal hydrochloric acid (0.5 N HCl) to displace the adsorbed cations and saturate the moss peat exchange sites with H + .…”

Section: Methodsmentioning

confidence: 99%

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

Rippy¹,

Nelson²

2007

HORTS

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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 cmolÁkg -1 (meqÁ100 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.

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“…Cation exchange capacity is a measure of the total amount of exchangeable cations that can be held by a sorbent. The procedure adopted to determine this characteristic was a standard American Society for Testing and Materials method (Thorpe, 1973), which is a modified Puustjarvi method (Puustjarvi, 1956). The method is based on the theory that sorbents such as colloidal peat and lignite molecules are large and the surface activity of these molecules is caused by functional groups carrying a negative charge.…”

Section: Cation Exchange Studiesmentioning

confidence: 99%

Determination of Optimal Peat Type to Potentially Capture Copper and Cadmium from Solution

Brown¹,

Gill²,

Allen³

2001

Water Environment Research

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The focus of this study was to determine the optimum type of peat for application as a medium to capture dissolved metals from aqueous solution. Seventeen media were examined, including eleven Irish peat samples from various locations and stages in processing, a Northern Ireland lignite, peat and lignite chars, a commercial-grade bone char, and two commercial-grade granular activated carbons. Considerable variation in sorption capacity was found with a ratio of 20:1 between the best-performing (bone char) and the poorest-performing (peat char) samples. Among the 14 varieties of peat, the best-performing sample outperformed the commonly investigated sphagnum moss by a ratio of 4:1. A correlation has been established between cation exchange capacity, the presence of adsorbed calcium, and the uptake capacity of different peats. This correlation will be a valuable tool in choosing peat type for filter media for metals removal applications. Water Environ. Res., 73, 351 (2001).

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Collaborative Study of the Cation Exchange Capacity of Peat Materials

Cited by 28 publications

References 0 publications

Effect of Fertilizer Rate on Growth of Azalea and Holly in Pine Bark and Pine Tree Substrates

Effect of Fertilizer Rate on Growth of Azalea and Holly in Pine Bark and Pine Tree Substrates

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

Determination of Optimal Peat Type to Potentially Capture Copper and Cadmium from Solution

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