Effectiveness of Recovered Magnesium Phosphates as Fertilizers in Neutral and Slightly Alkaline Soils

Massey, Michael S.; Davis, Jessica G.; Ippolito, James A.; Sheffield, Ronald E.

doi:10.2134/agronj2008.0144

Cited by 122 publications

(118 citation statements)

References 22 publications

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“…In the Se SSP outperformed struvite, while the reverse was true on the Cf soil and on the Ia no response was observed from either SSP or struvite (Table 3). The inconsistent performance of struvite has been reported before by Ackerman et al (2013) and Massey et al (2009) they both concluded that struvite effectiveness as a P fertilizer is dependent on soil properties. This proposition is in agreement with the results obtained on this study.…”

Section: Discussionmentioning

confidence: 79%

Possible use of struvite as an alternative phosphate fertilizer

Nongqwenga

Muchaonyerwa

Hughes

et al. 2017

J. Soil Sci. Plant Nutr.

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Struvite, from human urine, is an alternative phosphorus (P) fertilizer. This study evaluated P release from struvite and its effectiveness for maize in Inanda (Ia), Sepane (Se) and Cartref (Cf) soils. Phosphorus sorption isotherms were determined, an incubation study determined the release pattern of P from struvite, and a pot trial compared struvite with single superphosphate (SSP) on maize P uptake. The amount of P at equilibrium (where Q = 0) in the Cf was 1.39 mg L , respectively. The extractable P in all three soils increased with time, with evidence of declining P release after Day 8. Struvite was most effective as a P source in the Cf followed by Se and Ia. Compared to SSP, there was significant improvement in maize grown on the Cf, while the reverse occurred in the Se. Maize grown in the Ia did not respond to either struvite or SSP. It was concluded that the phosphorus sorption was the main limiting factor that governed struvite effectiveness as a P source.

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Section: Discussionmentioning

confidence: 79%

Possible use of struvite as an alternative phosphate fertilizer

Nongqwenga

Muchaonyerwa

Hughes

et al. 2017

J. Soil Sci. Plant Nutr.

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“…Previous studies comparing P fertilizers/struvites recovered from various materials to commercial P fertilizer have reported that the recycled products increased DMY in maize [20], led to comparable DMY in perennial ryegrass [22], or at least improved DMY compared to untreated controls in several crops [17][18][19]43].…”

Section: The Fertilizing Performance Of P-salt Is Equivalent To That mentioning

confidence: 98%

Can Phosphate Salts Recovered from Manure Replace Conventional Phosphate Fertilizer?

et al. 2017

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Pig farming produces more manure than can reasonably be spread onto surrounding fields, particularly in regions with high livestock densities and limited land availability. Nutrient recycling offers an attractive solution for dealing with manure excesses and is one main objective of the European commission-funded project "BioEcoSIM". Phosphate salts ("P-Salt") were recovered from the separated liquid manure fraction. The solid fraction was dried and carbonized to biochar. This study compared the fertilizing performance of P-Salt and conventional phosphate fertilizer and determined whether additional biochar application further increased biomass yields.The fertilizers and biochar were tested in pot experiments with spring barley and faba beans using two nutrient-poor soils. The crops were fertilized with P-Salt at three levels and biochar in two concentrations. Biomass yield was determined after six weeks. Plant and soil samples were analysed for nitrogen, phosphorus and potassium contents. The P-Salt had similar or even better effects than mineral fertilizer on growth in both crops and soils. Slow release of nutrients can prevent leaching, rendering P-Salt a particularly suitable fertilizer for light sandy soils. Biochar can enhance its fertilizing effect, but the underlying mechanisms need further investigation. These novel products are concluded to be promising candidates for efficient fertilization strategies.

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“…A few reports of the comparison of soils with different pH values can be found in previous research. 10,13 Cabeza et al 10 studied the effectiveness of struvite as fertilizer compared with superphosphate and phosphate rock in a 2-year pot experiment with maize in two soils with contrasting pH (4.7 and 6.6) and concluded that struvite was as effective as superphosphate in both soils.…”

Section: ■ Introductionmentioning

confidence: 99%

Influence of Soil and Irrigation Water pH on the Availability of Phosphorus in Struvite Derived from Urine through a Greenhouse Pot Experiment

Liu

Tao²,

Wen

et al. 2016

J. Agric. Food Chem.

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One greenhouse pot experiment was used to investigate the availability of phosphorus in struvite derived from urine affected by soil pH (cinnamon soil, pH 7.3; paddy soil, pH 5.3) and irrigation water (pH 6.0 and 7.5) with bird rapeseed (Brassica campestris L.). The biomass of applied struvite in paddy soil was significantly greater than that of applied calcium superphosphate. However, statistically significant differences were not observed in cinnamon soil. Soil-applied struvite had a higher Olsen P compared to soil-applied calcium superphosphate irrespective of soil type. The biomass of applied struvite and irrigation with pH 6.0 water was greater compared to that with irrigation with pH 7.3 water irrespective of soil type, accompanied with significantly higher leaf chlorophyll concentration. Therefore, struvite has the potential to be an effective P fertilizer, and acidic irrigation water has greater influence on the availability of phosphorus in struvite than does acidic soil. KEYWORDS: struvite, phosphorus, plant availability, soil, irrigation water ■ INTRODUCTIONPhosphorus (P), as an indispensable resource, is an essential nutrient for crop growth. The depletion timeline of P rock reserves ranges from 30 to 300 years.1 Although this estimation provides substantial uncertainty and more accurate data are lacking, there is no doubt regarding the irreversible depletion of high-concentration rock P reserves and the decline of the quality of the reserves (such as % P and presence of impurities) over time, 1 resulting in higher economic and energy cost for P exploitation. If P can be recovered in an economical way, it can re-enter the agricultural supply chain, displacing the consumption of traditional P fertilizer. It helps to create an ecofriendly environment by reducing the need for P rock 2 and to alleviate the P load emissions to water bodies. Human urine accounts for approximately 50% of the total P load in municipal wastewater, with <1% of the total wastewater volume.3 Direct application of urine in agriculture is feasible in practice. 4 However, huge quantities of separated urine are often difficult to transport and to store due to its unpleasant odor. Furthermore, health risk due to micropollutants and nitrogen (N) loss due to ammonia volatilization will be unavoidable during the application of urine to soil. Therefore, P recovery from urine in the form of struvite crystals will be a promising option with easy transportation, hygiene safety, and less nutrient loss.Struvite crystal is formed with an equal molar concentrations of magnesium (Mg), ammonium, and phosphate combined with six water molecules (MgNH 4 PO 4 ·6H 2 O), which contains 5.7% N, 12.6% P, and 9.9% Mg by weight. The solubility of struvite is highly dependent on pH, 5 and it is sparingly soluble in neutral and alkaline solutions, but readily soluble in acid solution. The P in the urine is mainly present as inorganic phosphate, and struvite obtained from urine has the advantages of higher P 2 O 5 content (28.9%) compared to common ...

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Effectiveness of Recovered Magnesium Phosphates as Fertilizers in Neutral and Slightly Alkaline Soils

Abstract: A gronomy J our n al • Volume 101, I s sue 2 • 2 0 0 9 323

Cited by 122 publications

References 22 publications

Possible use of struvite as an alternative phosphate fertilizer

Possible use of struvite as an alternative phosphate fertilizer

Can Phosphate Salts Recovered from Manure Replace Conventional Phosphate Fertilizer?

Influence of Soil and Irrigation Water pH on the Availability of Phosphorus in Struvite Derived from Urine through a Greenhouse Pot Experiment

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