In a well-sorted medium-coarse sand, the drive point method produced K fs and a* values which were plausible and consistent with other data from the field site. The HYDRUS-2D numerical simulation model was used to determine appropriate shape values (C DP) for the drive point analysis and an empirical regression equation was developed to convert the discrete C DP values into continuous shape functions for porous materials with negligible-moderate, strong and very strong capillarity. We also developed a steady flow analysis to account for the fact that water discharge through the drive point screen is solely radial, rather than both radial and vertical as in the original GP method. We circumvented these issues, by replacing the GP well with a conically tipped well screen or "drive point" which is pushed, driven, rotated or vibrated to the desired depth. Its application can be difficult, however, in gravelly materials which are problematic to auger, and in un-cohesive sandy materials which collapse during the augering process or upon wetting of the unlined well. The Guelph Permeameter (GP) is a widely used well/auger-hole method for in-situ determination of field-saturated hydraulic conductivity (K fs) and sorptive number ( a*) in the vadose or unsaturated zone. A drive point application of the Guelph permeameter method for coarse-textured soils: Geoderma, 187-188, p. Daniel (Agriculture and Agri-Foods Canada, Greenhouse and Processing Crops Research Centre, Harrow, ON, Canada) and Lewis, Jeffrey K. These small changes in the constitution of the soil solution do not suggest wood ash application as a method to improve soil quality in an initial phase.ġ2081594 Reynolds, W. No change in exchangeable cations was observed during the study period, and no increase of heavy metals in bilberries did occur. Temporary increases in soil solution concentration were found for K in the recharge area and Ca and SO 4 in the discharge area when comparing ashed and control areas. The soil solution chemistry, exchangeable pool of cations and potential heavy metal accumulation in berries were studied.
The sampling area was situated in a slope towards a stream, to include the effect on both recharge- and discharge areas with different soil constitutions. In this investigation a small boreal catchment in central Sweden was studied for 2 years before and 2 years after treatment with the maximum recommended dose, 3 tonnes/ha, of crushed, self-hardened wood ash. With the conception that whole tree harvesting leads to an impoverishment of forest soils wood ash application is recommended, with the foremost benefits being increased pH in soil and subsequent surface waters, and recycling of nutrients from the wood ash. 5 tables, sketch map, 34 ref., October 2012. Initial effects of wood ash application to soil and soil solution chemistry in a small, boreal catchment: Geoderma, 187-188, p.
#Departamento cartographica galaxy map serial#
Serial | Conference | Report SERIAL REFERENCESġ2081597 Norstrom, Sara H. (Mid Sweden University, Department of Natural Sciences, Engineering and Mathematics, Sundsvall, Sweden) Bylund, Dan Vestin, Jenny L. View all PMAsĮntries in each category are listed in chronological order starting with the most recent citation.
To view a list of the individual PMAs follow the button below.
0 kommentar(er)
