Subsurface tile drains are used extensively throughout many agricultural areas of New Zealand to reduce excessive wetness from grazed pastures. Along with transporting water, subsurface drains also transport nutrients which have leached from the soil, potentially bypassing natural attenuation processes in shallow groundwaters and riparian zones. These nutrients have the capacity to cause excess...

Jamieson, R.C., Gordon, R.J., Sharples, K.E., Stratton, G.W. and Madani, A. 2002. Movement and persistence of fecal bacteria in agricultural soils and subsurface drainage water: A review. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada 44:1.1-1.9. The presence of pathogenic bacteria in public and private water systems has emerged in the past year as a priority water quality i...

One measure used in Sweden to mitigate eutrophication of waters is the construction of small wetlands (free water surface wetland for phosphorus retention [P wetlands]) to trap particulate phosphorus (PP) transported in ditches and streams. This study evaluated P retention dynamics in a newly constructed P wetland serving a 26-ha agricultural catchment with clay soil. Flow-proportional composit...

Thanks to a careful study of elementary properties of two-bytwo substitution systems, we give a complete self-contained elementary construction of an aperiodic tile set and sketch how to use this tile set to elementary prove the undecidability of the classical Domino Problem.

Although the design of DNA tiles has been optimised for efficient and specific self-assembly, assembly errors occur so often that applications for molecular computation remain limited. We propose the use of an enveloped tile consisting of a DXbase tile that carries a protector tile to suppress erroneous tile assembly. The design of the enveloped tile promotes the dissociation of the protector t...

Controlled tile drainage (CTD) practices are a promising tool for improving water balance, quality and increasing crop yield by raising shallow groundwater level capillary rise due to flow retardation. We tested the effect of CTD on growth grain spring barley, at study site in central Bohemia using vegetation indices from unmanned aerial vehicle (UAV) imagery Sentinel-2 satellite imagery. Tile ...

Nutrient export from agricultural land to surface waters is a significant environmental concern within the Great Lakes Basin (GLB). A field-based watershed-scale study was completed investigate spatial and temporal variations of phosphorus nitrate assess nutrient transport pathways groundwater-surface water interactions in an agriculturally dominated clay plain system. This conducted 127 km2 Up...

Treatment wetlands are increasingly needed to remove nitrate from agricultural drainage water to protect downstream waters, such as the Gulf of Mexico. This project sought to develop a new edge-of-field treatment wetland, designed to remove nitrate-nitrogen and enhance phosphorus removal by plant harvest and to monitor its effectiveness. A 0.10 ha wetland was designed and installed to treat sub...

The objective of this study was to explore if more crop-specific plant growth modules can improve simulations of crop yields, and N in tile flow under different management practices compared with a generic plant growth module. We calibrated and evaluated the Root Zone Water Quality Model (RZWQM) with the Decision Support for Agrotechnology Transfer (DSSAT v3.5) plant growth modules (RZWQM–DSSAT...

Biochar has received increased attention in environmental applications recent years. Therefore, three pilot-scale denitrifying bioreactors, one filled with woodchips only and the other two enriched 10% 20% by volume of biochar from deciduous wood, were tested under field conditions for removal nitrate (NO3-N) phosphate (PO4-P) tile drainage water Lithuania over a 3-year period. The experiment s...