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Human Impacts Recorded in Chemical and Isotopic Fingerprints of Soils from Dunedin

We present results from the first urban chemical and isotopic soil baseline survey to be completed for a New Zealand city. The major, minor, trace and isotopic composition of soils from different depths across the city of Dunedin are shown to be…

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Efficacy of subsurface denitrification to attenuate nitrate in shallow groundwaters

Our preliminary results indicate occurrence of complete ‘benign’ denitrification in the reducing shallow groundwater sites with lower dissolved oxygen (DO) contents (DO < 1mg L-1), as compared with the oxidizing shallow groundwater s…

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Phosphorus and iron-oxide transport from a hydrologically isolated grassland hillslope

Losses of N, P and Fe in drainage responded differently to waterlogging.
Moderate nitrate concentration prevented Fe–P dissolution and loss in drainage.
Low nitrate concentrations corresponded with high iron and P losses …

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SedNetNZ, SLUI and contaminant generation. Part 1: Sediment and water clarity

Horizons Regional Council asked Manaaki Whenua – Landcare Research to document the use of SedNetNZ in the Horizons region; update the assessment of the impact of soil conservation work to date, and possible future work under the Sustainable Land…

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An event-based model of soil erosion and sediment transport at the catchment scale

Soil conservation over large areas is expensive and needs to be targeted to obtain maximum benefit for the least cost. In this paper, an event-based model of soil erosion and sediment transport is outlined in the context of the Manawatū catchmen…

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Reshaping a farming culture through participatory extension: An institutional logics perspective

Participatory extension programmes influenced practices, beliefs and values underlying the learning logic (changing from a ‘linear’ to ‘multi-actor’ logic) and thus can help facilitate more effective practice change by pr…

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A Global Perspective on Phosphorus Management Decision Support in Agriculture: Lessons Learned and Future Directions

The evolution of phosphorus (P) management decision support tools and systems has been most strongly affected in developed regions by national strategies (i) to optimize levels of plant available P in agricultural soils, and (ii) to mitigate P r…

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Towards implementation of robust monitoring technologies alongside freshwater improvement policy in NZ

International studies point out that some freshwater policy objectives are not achieved. This study describes that this is in part caused by shortcomings that include: the lack of targeted monitoring schemes to measure impact; a too-small range …

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Assessing the Effectiveness of On-Farm Mitigation Actions

This research summary describes how effective on-farm mitigations have been so far, by comparing losses of nitrogen (N), phosphorus (P) and sediment in 1995 and 2015. It also models what would be possible for future water quality in 2035 if ever…

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Map of Total Nitrogen Excess and Reduction Potential

An interactive map shows the total nitrogen (TN) in excess of current national rules and the potential for mitigation strategies to reduce TN losses from land to water by 2035. The map allows users to zoom in to any of New Zealand’s catchm…

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Better Phosphorus Use Can Ensure its Stocks Last More than 500 Years and Boost Global Food Production

The world has enough stocks of phosphorus to boost global food production for over 500 years – but only if countries are less wasteful with how they use this finite supply.

More efficient use of phosphorus could see limited stocks of the …

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Map of Total Phosphorus Yield and Reduction Potential

An interactive map shows the total phosphorus (TP) yield and the potential for mitigation strategies to reduce TP losses from land to water by 2035.

The map allows users to zoom in to any of New Zealand’s catchments or regions, and …

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