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Nutrient Management

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New Zealand farmers can keep more nutrients in their soil by choosing the right fertiliser for their type of land and applying it strategically, so it stays on the farm rather than draining away as pollution.

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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

The effect of soil moisture extremes on the pathways and forms of phosphorus lost in runoff from two contrasting soil types

Soil moisture and Olsen P concentrations play an important role in phosphorus (P) losses in runoff. Our hypotheses were as follows: (1) rainfall applied to…
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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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Guidance

Towards a Physiographic Map: Information for Regional Councils

Physiographic Environments of New Zealand research is developing a cost-effective technique to measure and map (as an integrated physiographic layer) how features of the natural…
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Journal Article

Managing diffuse phosphorus at the source versus at the sink

Judicious phosphorus (P) management is a global grand challenge and critical to achieving water quality objectives while maintaining food production. The management of point sources…
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Journal Article

Transforming soil phosphorus fertility management strategies to support the delivery of multiple ecosystem services from agricultural systems

Despite greater emphasis on holistic phosphorus (P) management, current nutrient advice delivered at farm-scale still focuses almost exclusively on agricultural production. This limits our ability…
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Journal Article

Why are median phosphorus concentrations improving in New Zealand streams and rivers?

Between 2004 and 2013 phosphorus concentrations decreased at 65% of the 304 sites monitored. Our research found the most probable causes of improvement were that…
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Journal Article

The efficacy of good practice to prevent long-term leaching losses of phosphorus from an irrigated dairy farm

We measured P fractions in leachate at 70cm depth from two soils of low-P sorption capacity in an intensively grazed dairy farm. In response to…
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Journal Article

Applications of the Soil, Plant and Rumen Microbiomes in Pastoral Agriculture

This paper was commissioned by Our Land and Water to test the hypothesis: ‘Significant additional gains in soil, plant, and animal productivity, coupled with reduced…
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Journal Article

Direct exports of phosphorus from fertilizers applied to grazed pastures in Australasia

The 4R concept was developed to help mitigate P exports. This review investigates the factors affecting P exports soon after the application of mineral fertilizers…
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Journal Article

A global perspective on the history of phosphorus management decision support approaches in agriculture: Lessons learned and directions for the future

The evolution of phosphorus (P) management decision support tools (DSTs) and systems (DSS), in support of food and environmental security has been most strongly affected…
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