Phosphorus loss

Quin, B. F.; Hart, M. R.; Blennerhassett, J. D.; Wedderburn, Liz

doi:10.1080/00288233.2004.9513577

Cited by 1 publication

(2 citation statements)

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“…From this semi‐empirical approach, it was concluded that if applied in December, soluble P fertilizers would account for <10% of total P exports for the year (McDowell et al, 2009b; McDowell and Catto, 2005). While the methodology did not readily lend itself to detailed scenario testing and the outcomes of the study have been questioned (Quin et al, 2004), they are consistent with other modeling (Vadas et al, 2015). …”

Section: Forms Of Phosphorus In Agricultural Drainage and Their Mobilsupporting

confidence: 51%

“…In Australasia (i.e., Australia and New Zealand), intensive pasture-based grazing is often the primary land use in catchments with impaired water quality (Dairy Australia, 2019;McDowell et al, 2009a;Meat and Livestock Australia, 2017;PricewaterhouseCoopers, 2011;Sinclair Knight Merz, 2011). Although some aspects of water quality may be improving in New Zealand (Larned et al, 2016), P exports from pastures remain a concern (Ballantine and Davies-Colley, 2014;Julian et al, 2017;McDowell et al, 2009a).…”

Section: Direct Exports Of Phosphorus From Fertilizersmentioning

confidence: 99%

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Direct Exports of Phosphorus from Fertilizers Applied to Grazed Pastures

Nash¹,

McDowell

Condron

et al. 2019

J of Env Quality

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Since its discovery in 1669, phosphorus (P) in the form of fertilizer has become an essential input for many agroecosystems. By introducing a concentrated P source, fertilizers increase short‐term P export potential soon after their application and longer‐term export potential by increasing soil fertility (legacy P). The 4R concept was developed to help mitigate P exports from the fertilizers that sustain agricultural productivity. This review investigates the factors affecting P exports soon after the application of mineral fertilizers to pasture‐based grazing systems and studies quantifying its potential impact in different systems, with an emphasis on Australasia. Initially, P fertilizers and reactions that might affect their short‐term P export potential are reviewed, along with P transport pathways, the forms of P exported from grazing systems, factors affecting P mobilization into water, and studies demonstrating the possible short‐term effects of fertilizer application on P exports. Using that foundation, we review studies quantifying the short‐term impact of fertilizer application in different regions; they show that 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 then use three model systems of varying hydrology that are common to Australasia to demonstrate the principles for selecting fertilizers that are likely to minimize P exports soon after their application. Core Ideas Fertilizers increase P exports directly or by increasing P cycling. We review P pathways and processes relevant to grazing systems. Direct fertilizer P exports can be comparatively small (<10% of annual exports). Fertilizer selection to minimize P exports in three model systems is demonstrated.

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