Influence of rates of reactive phosphate rock and sulphur on potentially available phosphorous in organically managed soils in the south-eastern near-Mediterranean cropping region of Australia

Evans, Jeffrey; Price, Andrew

doi:10.1007/s10705-008-9230-y

Cited by 9 publications

(4 citation statements)

References 19 publications

(36 reference statements)

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“…Incorporating S 0 into the phosphate rock sources increased their effectiveness, and similar results have been obtained by others in Australia since (Jones and Field 1976;Friesen et al 1987), in line with experiences overseas (for a review see Boswell and Friesen 1993). More recently, Evans and Price (2009) found that ground S 0 applied with ground phosphate rock increased Olsen-extractable P in 5 out of 11 soils compared with phosphate rock applied on its own. However, very high rates of S 0 were applied, up to 400 kg/ha.…”

Section: Fertiliser Formulations To Improve Puesupporting

confidence: 81%

The chemical nature of P accumulation in agricultural soils—implications for fertiliser management and design: an Australian perspective

et al. 2011

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Many agricultural soils worldwide in their natural state are deficient in phosphorus (P), and the production of healthy agricultural crops has required the regular addition of P fertilisers. In cropping systems, P accumulates almost predominantly in inorganic forms in soil, associated with aluminium, calcium and iron. In pasture soils, P accumulates in both inorganic and organic forms, but the chemical nature of much organic P is still unresolved. The P use efficiency (PUE) of fertilisers is generally low in the year of application, but residual effectiveness is important, highlighting the importance of soil P testing prior to fertiliser use. With increasing costs of P fertiliser, various technologies have been suggested to improve PUE, but few have provided solid field evidence for efficacy. Fluid fertilisers have been demonstrated under field conditions to increase PUE on highly calcareous soils. Slow release P products have been demonstrated to improve PUE in soils where leaching is important. Modification of soil chemistry around the fertiliser granule or fluid injection point also offers promise for increasing PUE, but is less well validated. Better placement of P, even into subsoils, also offers promise to increase PUE in both cropping and pasture systems. AbbreviationsDAP diammonium phosphate DCPD dicalcium phosphate dihydrate EDTA ethylenediamine tetraacetate MAP monoammonium phosphate MCP monocalcium phosphate NMR nuclear magnetic resonance OM organic matter P phosphorus P i inorganic P P o organic P PUE P use efficiency RPR reactive phosphate rock TSP triple superphosphate XANES x-ray absorption near-edge structure Plant Soil (

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Section: Fertiliser Formulations To Improve Puesupporting

confidence: 81%

The chemical nature of P accumulation in agricultural soils—implications for fertiliser management and design: an Australian perspective

et al. 2011

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“…Mixing elemental S, which is allowed as an input for certified organic farming, with PR may provide a source of both nutrients. The oxidation of elemental S to H 2 SO 4 may enhance PR dissolution for organic farming, as reported by Evans et al (2006), Evans and Price (2009). It should be noted that the effective use of PR with or without elemental S for certified organic farming, as for conventional farming, depends on the reactivity of the PR sources used.…”

Section: Reactions and Agronomic Effectiveness Of Fluid And Solid Wspmentioning

confidence: 84%

Agronomic and environmental aspects of phosphate fertilizers varying in source and solubility: an update review

Chien

Prochnow

Tu³

et al. 2010

Nutr Cycl Agroecosyst

218

155

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This review discusses and summarizes the latest reports regarding the agronomic utilization and potential environmental effects of different types of phosphate (P) fertilizers that vary in solubility. The agronomic effectiveness of P fertilizer can be influenced by the following factors: (1) water and citrate solubility; (2) chemical composition of solid watersoluble P (WSP) fertilizers; (3) fluid and solid forms of WSP fertilizers; and (4) chemical reactions of P fertilizers in soils. Non-conventional P fertilizers are compared with WSP fertilizers in terms of P use efficiency in crop production. Non-conventional P fertilizers include directly applied phosphate rock (PR), partially acidulated PR (PAPR), and compacted mixtures of PR and WSP. The potential impacts of the use of P fertilizers from both conventional (fully acidulated) and non-conventional sources are discussed in terms of (1) contamination of soils and plants with toxic heavy metals, such as cadmium (Cd), and (2) the contribution of P runoff to eutrophication. Best practices of integrated nutrient management should be implemented when applying P fertilizers to different cropping systems. The ideal management system will use appropriate sources, application rates, timing, and placement in consideration of soil properties. The goal of P fertilizer use should be to optimize crop production without causing environmental problems.

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“…Those specially developed rock phosphate or bone meal fertilizers generating acid phases to dissolve P (Evans and Price 2009;Schnug et al 2003) or microbial amendments to increase P-availability (Schnug and Haneklaus 2006) have not yet been introduced in practice.…”

Section: Suitable Fertilizers Must Be Discussedmentioning

confidence: 99%

Phosphorus—The Predicament of Organic Farming

Paulsen

Köpke

Oberson

et al. 2016

Phosphorus in Agriculture: 100 % Zero

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Today on many sites organic farming might neglect phosphorus (P) fertilization due to soil reserves build up by P fertilization of former farming systems. Additionally organic farming has restricted itself to the use of non-solubilised rock phosphate as mineral fertilizer source that only has limited plant availability on agricultural soils with adequate pH. Also recycling of P from the food chain back to organic agriculture is not consequently realised. These predicaments of organic farming endanger its future sustainability. The article gives an overview on the state of knowledge of the use of topsoil and subsoil P reserves by plants in organic production, on possibilities to activate them by biological measures for direct use by plants and for their redistribution on farms. As in legislation phosphate rock is defined as prevailing mineral fertilizer source for organic farming, a detailed view is given on the use of its P in dependence of plant variety. Also attempts to improve its fertilizer value by mixtures with organic matter are reviewed. It is obvious that plant roots and soil organisms can activate P from the soil and keep it in biological turnover. This is a promising concept to use soil reserves, but quantification of time-spans offering sufficient P supply just by this approach is not possible. Therefore, while promoting root density, root penetration and biological activity in soils, site specific analyses of plant available P in soil, analyses of field and farm P-budgets as well as of plants P supply are necessary to decide on P-fertilization. Soluble P sources, preferably from recycling processes, should be developed for future fertilization demands of organic farming.

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Influence of rates of reactive phosphate rock and sulphur on potentially available phosphorous in organically managed soils in the south-eastern near-Mediterranean cropping region of Australia

Cited by 9 publications

References 19 publications

The chemical nature of P accumulation in agricultural soils—implications for fertiliser management and design: an Australian perspective

The chemical nature of P accumulation in agricultural soils—implications for fertiliser management and design: an Australian perspective

Agronomic and environmental aspects of phosphate fertilizers varying in source and solubility: an update review

Phosphorus—The Predicament of Organic Farming

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