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Nitrogen

Kseniya Kopna, Pexels

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Nitrogen can help plants grow, but too much pollutes our rivers, lakes and groundwater. These resources can improve your understanding of how nitrogen flows through our environment, the drivers for regulation, and help you reduce nitrate leaching.

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Summary

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…
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Journal Article

Estimation of nutrient loads from monthly water quality data

Causes of variation between loads estimated using alternative calculation methods and their repeatability were investigated using 20 years of daily flow and monthly concentration samples…
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Technical Report

Predicting Land-Based Nitrogen loads and Attenuation in the Rangitikei River Catchment – the Implications for Land Use

Where both the intensity of land use in high N-attenuation areas was increased and the intensity of land use in low N-attenuation areas was decreased,…
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Technical Report

Predicting Land-Based Nitrogen Loads and Attenuation in the Rangitikei River Catchment – the model development

We investigated and developed a simple model to account for the influence of different soil types and underlying geology on the transformation of nitrogen (N)…
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Journal Article

Temperature and Nitrogen Effects on Phosphorus Uptake by Agricultural Stream-Bed Sediments

Climate change will likely increase the growing season, temperatures, and ratio of nitrogen (N) to phosphorus (P) loss from land to water. However, it is…
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Journal Article

Balancing water-quality threats from nutrients and production in Australian and NZ dairy farms under low profit margins

We summarise the losses of N and P from Australasian dairy farms, examine the policy drivers used for mitigating losses and evaluate the effectiveness of…
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Presentation

Benign denitrification in the subsurface environment

Our Land and Water Symposium, April 2017
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Journal Article

Denitrification potential in the subsurface environment in the Manawatu River catchment

Understanding the effects of hydrogeological factors on loss, transport and fate of farm nutrients is essential for predicting their impacts on ecosystem health of receiving…
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Journal Article

Does variable rate irrigation decrease nutrient leaching losses from grazed dairy farming?

A six‚Äêyear study was conducted to determine whether the use of variable rate irrigation (VRI), compared to uniform rate irrigation (URI), could decrease N and…
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Journal Article

Assessing the Yield and Load of Contaminants with Stream Order: Would Policy Requiring Livestock to Be Fenced Out of High-Order Streams Decrease Catchment Contaminant Loads?

This paper won the JEQ Best Paper Award 2019. Concentration and flow data for 1998 to 2009 were used to calculate catchment load and yields…
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Journal Article

Anthropogenic increases of catchment nitrogen and phosphorus loads in New Zealand

Spatial regression models were used to predict yields of nitrogen (N) and phosphorus (P) discharged from catchments throughout New Zealand. The models were derived using…
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Journal Article

Transport and potential attenuation of nitrogen in shallow groundwaters in the lower Rangitikei catchment

Intensive agricultural activities are generally associated with nitrogen leaching from agricultural soils with potential to contaminate groundwater and surface waters. We studied nitrogen losses and…
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