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Your search keyword '"Chanasyk, D.S."' showing total 43 results
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43 results on '"Chanasyk, D.S."'

2. Management impacts on organic carbon under continuous perennial grass, perennial grass-legume mixture, and annual cereals on a thick Black Chernozemic soil.

Author

Mapfumo, E., Baron, V.S., Lemke, R., Naeth, M.A., Chanasyk, D.S., and Dick, Campbell

Subjects
BLACK cotton soil, GRASSES, PERENNIALS, BROMEGRASSES, SOIL management, SILAGE, TRITICALE, FORAGE plants
Abstract

Impacts of annual and perennial pasture management on soil organic carbon (SOC) and equivalent SOC stocks (equal soil mass basis) were investigated in two trials [CAESA (1994–1997) and BMP (2008–2012) trials] conducted on the same experimental paddocks at Lacombe, AB. The original site was broken from perennial grass in 1992, and the CAESA trial established in 1993. Between 1994 and 1997, half of the paddocks included winter triticale and a mixture of triticale and spring barley; half included smooth and meadow bromegrass; and each paddock was light, medium, or heavily grazed. The BMP trial (2008–2012) on the same paddocks included fertilized, direct seeded barley as silage; grazing and haying of unfertilized meadow bromegrass, fertilized meadow bromegrass, and meadow bromegrass and alfalfa mixture; and unfertilized oldgrass that was continuous since 1994. Between trials (1998–2007), all paddocks received no fertilizer. In the 0–15 cm depth, SOC under oldgrass was constant between 1994 and 2012 and averaged 88 Mg C ha−1. Under barley silage, SOC decreased from 89 to 72 Mg C ha−1 by 2012. Between 1994 and 2012, SOC decreased in all treatments re-established on original annual forage (1994–1998) but not to the level of barley silage. Light fraction carbon was the highest under oldgrass and the lowest under barley silage. Overall, oldgrass with no fertilizer inputs maintained a constant SOC, although annuals reduced SOC stocks. Re-establishment of perennial grass with grazing may therefore reduce SOC loss, whereas haying perennial grass may not reduce SOC loss. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Soluble calcium and sulphate excesses related to stress in Pinus contorta on peat amendments of reclaimed landscapes in the boreal oil sands region.

Author

Middleston C., Mine closure 2011 Lake Louise, Canada 18-Sep-1121-Sep-11, Chanasyk D.S., Hastie J., Salifu K.F., Tedder W.S., Middleston C., Mine closure 2011 Lake Louise, Canada 18-Sep-1121-Sep-11, Chanasyk D.S., Hastie J., Salifu K.F., and Tedder W.S.

Abstract

A 13-year-old stand of Pinus contorta (lodgepole pine) showed various symptoms and degrees of nutrient deficiency on a reclaimed tailings sand dyke at the Suncor oil sands project in Alberta, Canada. The poorest growth occurred on soil from a deep mesic peat deposit underlain by marl, intermediate growth was observed on a peat-mineral mix of shallow, fibric origin and the best growth was on soil of moist upland forest floor origin with a cover of moss and litter fill. Soil samples were analysed for salinity and soluble cations, reaction and available nutrients in autumn 2005 and soil moisture profiles to 160 cm were determined during the 2006 growing season. The results showed a negative relationship between pine performance and increasing Ca and available sulphate-S, with the relationships stronger than indicators typically linked to poor peat amendment quality. Ca and SO4 were the main contributors to electrical conductivity and were also associated with elevated CaCO3(eq). The presence of elevated carbonates in some amendments contributed to high resistance to acidification of the upper soil profile by leaching, and alkaline reclamation soil may be detrimental to pine growth in relation to P availability., A 13-year-old stand of Pinus contorta (lodgepole pine) showed various symptoms and degrees of nutrient deficiency on a reclaimed tailings sand dyke at the Suncor oil sands project in Alberta, Canada. The poorest growth occurred on soil from a deep mesic peat deposit underlain by marl, intermediate growth was observed on a peat-mineral mix of shallow, fibric origin and the best growth was on soil of moist upland forest floor origin with a cover of moss and litter fill. Soil samples were analysed for salinity and soluble cations, reaction and available nutrients in autumn 2005 and soil moisture profiles to 160 cm were determined during the 2006 growing season. The results showed a negative relationship between pine performance and increasing Ca and available sulphate-S, with the relationships stronger than indicators typically linked to poor peat amendment quality. Ca and SO4 were the main contributors to electrical conductivity and were also associated with elevated CaCO3(eq). The presence of elevated carbonates in some amendments contributed to high resistance to acidification of the upper soil profile by leaching, and alkaline reclamation soil may be detrimental to pine growth in relation to P availability.

Published
2011

30. Influence of long-term application of feedlot amendments to cropland on ground elevation, Ah horizon depth, and soil color.

Author

Miller, J.J., Beasley, B.W., Drury, C.F., Larney, F.J., Hao, X., Chanasyk, D.S., and Yang, X.M.

Subjects
SOIL amendments, FEEDLOTS, SOIL horizons, SOIL color, FERTILIZERS
Abstract

Copyright of Canadian Journal of Soil Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017
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33. Plant dewatering and strengthening of tailings: laboratory and computer simulations.

Author

Silva M.J., Tailings and mine waste '99 Fort Collins, Colorado 24-Jan-9927-Jan-99, Biggar K.W., Chanasyk D.S., Naeth M.A., Sego D.C., Silva M.J., Tailings and mine waste '99 Fort Collins, Colorado 24-Jan-9927-Jan-99, Biggar K.W., Chanasyk D.S., Naeth M.A., and Sego D.C.

Abstract

An experiment was conducted to validate a model that simulates the strength enhancement mechanism of plants. The model simulates one dimensional water flow in a tailings deposit by solving a transient flow equation coupled with water extraction via the root systems. It predicts the solids content profile and pore water pressure profiles, which are used to estimate the bearing capacity. Composite tailings with an initial solids content of 65% from Syncrude's Alberta oil sands operations were placed in non-draining lysimeters. Five plant species were tested. The solids content profiles and bearing capacities were compared with their respective values predicted with the model. A good agreement was found., An experiment was conducted to validate a model that simulates the strength enhancement mechanism of plants. The model simulates one dimensional water flow in a tailings deposit by solving a transient flow equation coupled with water extraction via the root systems. It predicts the solids content profile and pore water pressure profiles, which are used to estimate the bearing capacity. Composite tailings with an initial solids content of 65% from Syncrude's Alberta oil sands operations were placed in non-draining lysimeters. Five plant species were tested. The solids content profiles and bearing capacities were compared with their respective values predicted with the model. A good agreement was found.

Published
1999

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