Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/119026
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Type: Journal article
Title: Influence of soil phosphorus status, texture, pH and metal content on the efficacy of amendments to pig slurry in reducing phosphorus losses
Author: O' Flynn, C.
Fenton, O.
Wall, D.
Brennan, R.
Mclaughlin, M.
Healy, M.
Citation: Soil Use and Management, 2018; 34(1):1-8
Publisher: Wiley
Issue Date: 2018
ISSN: 0266-0032
1475-2743
Statement of
Responsibility: 
C.J. O’Flynn, O. Fenton, D. Wall, R.B. Brennan, M.J. McLaughlin, M.G. Healy
Abstract: Cost‐effective strategies for using chemically amended organic fertilizers need to be developed to minimize nutrient losses in surface and groundwater. Coupling specific soil physical and chemical characteristics with amendment type could increase their effectiveness. This study investigated how water‐extractable phosphorus (P) was affected by chemical amendments added to pig slurry and how this effect varied with soil properties. A 3‐month incubation study was conducted on 18 different mineral soils, stored at 10 °C and 75% humidity and treated with unamended and amended slurry which was incorporated at a rate equivalent to 19 kg total P (TP)/ha. The amendments examined were commercial‐grade liquid alum, applied at a rate of 0.88:1 [Al:TP], and commercial‐grade liquid poly‐aluminium chloride (PAC), applied at a rate of 0.72:1 [Al:TP]. These amendments were previously identified by the authors as being effective in reducing incidental losses of P. The efficacy of the amendments varied with the soil test P, the degree of P saturation (DPS) and the Mehlich aluminium, iron and calcium, but not soil texture. Chemical amendments were most effective in soils with DPS over approximately 20%. Due to their high cost, the incorporation of amendments into existing management practices can only be justified as part of a holistic management plan where soils have high DPS.
Keywords: Pig slurry; P-sorbing amendments; water framework directive; degree of P saturation; soil test phosphorus
Rights: © 2017 British Society of Soil Science
DOI: 10.1111/sum.12391
Appears in Collections:Agriculture, Food and Wine publications
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