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

journal contribution
posted on 2024-06-21, 03:50 authored by David Nash, Rich McDowellRich McDowell, Leo Condron, Michael McLaughlin
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 and studies quantifying its potential impact in different systems. Initially, P fertilizers and reactions that might affect their short-term P export potential are reviewed, along with P transport pathways. We then review studies quantifying the short-term impact of fertilizer application in different regions. Under poor management, recently applied fertilizer can contribute a considerable proportion (30-80%) of total farm P exports in drainage, but when fertilizer is well-managed, that figure is expected to be <10%. We use three model systems of varying hydrology common to Australasia to demonstrate the principles for selecting fertilizers that are likely to minimize P exports soon after their application.

Funding

Funded by the New Zealand Ministry for Business, Innovation and Employment's Our Land and Water National Science Challenge (Toitū te Whenua, Toiora te Wai) as part of project Phosphorus Best Practice

History

Publication date

2019-08-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Journal of Environmental Quality

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