Characterization of Single Superphosphate Powders – a study of Milling Effects on Solubilization Kinetics

Plotegher, Fábio; Ribeiro, Cauê

doi:10.1590/1980-5373-mr-2015-0401

Cited by 43 publications

(16 citation statements)

References 32 publications

(39 reference statements)

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“…It is possible to see that Hap presents a weight loss of only 5% while SSP has a maximum weight loss of 10%22. These thermal events are related to elimination of physically bonded and structural water molecules (Fig.…”

Section: Resultsmentioning

confidence: 99%

Role of Slow-Release Nanocomposite Fertilizers on Nitrogen and Phosphate Availability in Soil

Giroto

Guimarães

Foschini

et al. 2017

Sci Rep

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151

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Developing efficient crop fertilization practices has become more and more important due to the ever-increasing global demand for food production. One approach to improving the efficiency of phosphate and urea fertilization is to improve their interaction through nanocomposites that are able to control the release of urea and P in the soil. Nanocomposites were produced from urea (Ur) or extruded thermoplastic starch/urea (TPSUr) blends as a matrix in which hydroxyapatite particles (Hap) were dispersed at ratios 50% and 20% Hap. Release tests and two incubation experiments were conducted in order to evaluate the role played by nanocomposites in controlling the availability of nitrogen and phosphate in the soil. Tests revealed an interaction between the fertilizer components and the morphological changes in the nanocomposites. TPSUr nanocomposites provided a controlled release of urea and increased the release of phosphorus from Hap in citric acid solution. The TPSUr nanocomposites also had lower NH3 volatilization compared to a control. The interaction resulting from dispersion of Hap within a urea matrix reduced the phosphorus adsorption and provided higher sustained P availability after 4 weeks of incubation in the soil.

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Section: Resultsmentioning

confidence: 99%

Role of Slow-Release Nanocomposite Fertilizers on Nitrogen and Phosphate Availability in Soil

Giroto

Guimarães

Foschini

et al. 2017

Sci Rep

Self Cite

151

View full text Add to dashboard Cite

show abstract

“…It should be noted that even in single superphosphates (SSP) the P 2 O 5 concentration may vary, depending on the manufacturing process, P concentration in the phosphate rock and other factors. According to other studies, the available P 2 O 5 content values in the SSP ranged from 16% to 23% [56], while multi-nutrient fertilizers like PK and NPK fertilizers contain around 5-12% P 2 O 5 [50]. Therefore, it can be concluded that the obtained recyclates have a full fertilizing value (taking into account the P 2 O 5 content and the bioavailability of the phosphates), comparable to commercial fertilizers currently used in agriculture.…”

Section: Chemical Composition Of Thermochemically Treated Ssa-secondamentioning

confidence: 83%

Thermochemical Treatment of Sewage Sludge Ash (SSA)—Potential and Perspective in Poland

2020

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Phosphorus (P) recovery from sewage sludge ash (SSA) is one of the most promising approaches of phosphate rock substitution in mineral fertilizers and might be a sustainable way to secure supply of this raw material in the future. In the current investigation, the process of thermochemical treatment of SSA was applied to SSA coming from selected mono-incineration plants of municipal sewage sludge in Poland (Cracow, Gdansk, Gdynia, Lodz, Kielce and Szczecin). The Polish SSA was thermochemically converted in the presence of sodium (Na) additives and a reducing agent (dried sewage sludge) to obtain secondary raw materials for the production of marketable P fertilizers. The process had a positive impact on the bioavailability of phosphorus and reduced the content of heavy metals in the obtained products. The P solubility in neutral ammonium citrate, an indicator of its bioavailability, was significantly raised from 19.7–45.7% in the raw ashes and 76.5–100% in the thermochemically treated SSA. The content of nutrients in the recyclates was in the range of 15.7–19.2% P2O5, 10.8–14.2% CaO, 3.5–5.4% Na2O, 2.6–3.6% MgO and 0.9–1.3% K2O. The produced fertilizer raw materials meet the Polish norms for trace elements covered by the legislation: the content of lead was in the range 10.2–73.1 mg/kg, arsenic 4.8–22.7 mg/kg, cadmium 0.9–2.8 mg/kg and mercury <0.05 mg/kg. Thus, these products could be potentially directly used for fertilizer production. This work also includes an analysis of the possibilities of using ashes for fertilizer purposes in Poland, based on the assumptions indicated in the adopted strategic and planning documents regarding waste management and fertilizer production.

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“…Both fertilizers promoted Mg and Ca contents due to the presence of high impurities (Mg and Ca contents) in phosphate fertilizers. Calcium and magnesium are common nutrients present in phosphate rocks and commonly increase the available of Ca and Mg in soil (Plotegher and Ribeiro 2016).…”

Section: Discussionmentioning

confidence: 99%

Dynamic of P Flux in Tropical Acid Soils Fertilized with Humic Acid–Complexed Phosphate

Zavaschi

Faria

Almeida

et al. 2020

J Soil Sci Plant Nutr

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Soils are characterized by high phosphorus (P) immobilization, considering the major limiting factor for agricultural production in Brazil. Phosphate fertilizers complexed with humic acids (HA) have been presented as an alternative to inhibit P immobilization in soils; however, little is known regarding its efficiency or its effect on soil P dynamics when associated with liming. The objective was to investigate labile moderately and non-labile P changes in sandy and clayey soils under application of distinct P sources and liming. Tropical soils were incubated using 200 mg kg −1 of P (simple superphosphate-SSP and SSP + HA), associated or not with calcium oxide. Check-plots were run in both soils without any P addition and/or no liming. After 60, 90, and 180 days of incubation, P contents were fractionated into P inorganic (Pi) and organic (Po), in the following pools: labile (P AER and P BIC), moderately labile (P HCl and P HID-0.1), and non-labile fractions (P HID-0.5 and P residual). There was a P flux between non-labile and labile fractions, controlled by the use of P fertilizer and liming. In sandy soil, the P addition promoted a clear P flux from non-labile to labile fractions; however, in clayey soil, there was a reverse P flux. The lack of P addition promotes a negative balance in soil with a decrease of labile fractions, mainly when associated with liming. Therefore, inputs are necessary to avoid soil P depletion.

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Characterization of Single Superphosphate Powders – a study of Milling Effects on Solubilization Kinetics

Cited by 43 publications

References 32 publications

Role of Slow-Release Nanocomposite Fertilizers on Nitrogen and Phosphate Availability in Soil

Role of Slow-Release Nanocomposite Fertilizers on Nitrogen and Phosphate Availability in Soil

Thermochemical Treatment of Sewage Sludge Ash (SSA)—Potential and Perspective in Poland

Dynamic of P Flux in Tropical Acid Soils Fertilized with Humic Acid–Complexed Phosphate

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