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August 30, 2024
Resources related to
Nitrogen
Kseniya Kopna, Pexels
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.
Showing 1 - 12 of 102 results
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…
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)…
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,…
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…
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…
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…
Presentation
Benign denitrification in the subsurface environment
Our Land and Water Symposium, April 2017
Journal Article
Does variable rate irrigation decrease nutrient leaching losses from grazed dairy farming?
A six-year study was conducted to determine whether the use of variable rate irrigation (VRI), compared to uniform rate irrigation (URI), could decrease N and…
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…
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…
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…
Technical Report
Evaluation of geospatial datasets and recognition of landscape gradients specific to water quality
This study evaluates the landscape relationships and suitability of existing geospatial datasets for the purposes of mapping physiographic water quality units for the Northland region.…