STUDY OF SOME PARAMETERS TO OBTAIN THE P&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;5&lt;/SUB&gt; WATER- SOLUBLE FROM PARTIALLY ACIDULATED PHOSPHATE ROCKS (PAPRs) BY SULFURIC ACID

Mizane, A.; Rehamnia, R.

doi:10.3363/prb.27.18

Cited by 12 publications

(11 citation statements)

References 8 publications

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“…However, most of these have not been utilized because of their low solubility and reactivity (13). Methods for increasing the solubility of PR by partial acidulation and calcination have been reported previously (14)(15)(16)(17). The International Fertilizer Development Center has promoted partial acidulation with sulfuric acid.…”

Section: Introductionmentioning

confidence: 99%

“…The International Fertilizer Development Center has promoted partial acidulation with sulfuric acid. Acidulation of PR produces the phosphate component monocalcium phosphate, small amounts of dicalcium phosphate, and residual apatite depending on the degree of acidulation (16). However, the viscosity and acidity of the product increase with increasing amounts of sulfuric acid because of the unbound sulfuric acid (14,15).…”

Section: Introductionmentioning

confidence: 99%

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Appropriate Use of Local Phosphate Rock Increases Phosphorus Use Efficiency and Grain Yield of Sorghum and Cowpea in the Sudan Savanna

et al. 2022

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Development of local P fertilizers using low-grade phosphate rock (PR) is expected to overcome the low-stagnated crop yield in Sub-Saharan Africa. Calcination and partial acidulation methods have been proposed to increase the phosphate (P) solubility of PRs. However, the effects of fertilization with calcinated PR (CPR) and partially acidulated PR (PAPR) on sorghum [Sorghum bicolor (L.)] and cowpea [Vigna unguiculata (L.) Walp.] cultivation are poorly understood. Therefore, we conducted a 2-year field experiment in Burkina Faso to identify the differences in sorghum and cowpea responses to CPR and PAPR application. The following eight treatments were applied with six replicates using a complete randomized block design: control without P fertilization, two types of CP (CPs), triple superphosphate (TSP) as a positive control for CPs, three types of PAPR with different degrees of acidulation (PAPRs), and single superphosphate (SSP) as a positive control for PAPRs. SSP mostly comprised of water-soluble P fraction (WP), TSP and PAPRs of WP and alkaline ammonium citrate-soluble P fraction (SP), and CPRs of SP and 2% citric acid-soluble P fraction (CP). Their solubility was in the order WP > SP > CP. The fertilization effects were evaluated by P use efficiency (PUE). In 2019, the biomass and P uptake of sorghum was decreased by the low available soil water at the early growth stage. On the contrary, cowpea survived the low available soil water because of its shorter growing period compared to sorghum. P fertilization significantly increased the grain yields. However, the effect size differed according to the crop and fertilizer types. The SP, along with WP, significantly contributed to the PUE and grain yield of sorghum, whereas only WP contributed to the PUE of cowpea. Therefore, CPs, mainly consisting of SP and CP, had a disadvantage compared to TSP, especially for cowpea. We thus concluded that PAPRs are effective for sorghum and would be effective for cowpea when the acidulation level is sufficiently high. We also conclude that the long growing period of sorghum is favorable for absorbing slow-release P, but is unfavorable for the variable rainfall often observed in this region.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Appropriate Use of Local Phosphate Rock Increases Phosphorus Use Efficiency and Grain Yield of Sorghum and Cowpea in the Sudan Savanna

et al. 2022

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“…Increased dissolution of the rock phosphates when added to soils may also be attributed to the neutralization of the OHions, released on hydrolysis of the phosphate ions, due to soil acidity. (Chhonkar, 1994, Mizane, andRehamnia, 2012)) also reported that P availability to plants was significantly increased in soil.…”

Section: Resultsmentioning

confidence: 91%

Partial acidulation of phosphate rock for enhanced phosphorus availability in alluvial soils of Bihar, India

Beura

Padbhushan

Pradhan

et al. 2016

JANS

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The present study was undertaken to fractionate partially acidulated phosphate rock (PAPR) and evaluate its effect on Phosphorus availability in alluvial soils. For this purpose, low grade phosphate rock was collected from Udaipur, Rajasthan and acidulated at different degrees with sulphuric acid (H2SO4) (v/v)Results from an incubation study showed that the available fraction of P [Water soluble (WSP) and Citrate soluble (CSP)] increased with increasing degree of acidulation. The maximum WSP was obtained at 50% H2SO4 (52.30% of total P) and the maximum CSP was obtained at 80% H2SO4 (49.54% of total P). 50 % dissolution of rock phosphate was the best treatment and found to be at par with that of 60% and 80% but was significantly superior to rest of the treatments. The maximum WSP in the soil samples was obtained after acidulation with 50 %H2SO4 and the maximum Olsenâ€™s P by the 14th day of incubation. An increasing trend was found at initial stages of incubation (7-14 days) with a notable decrease in the later stages. WSP demonstrated the maximum correlation at 40% dissolution(r = 96* for first order reaction, r =95* for second order reaction) while for Olsenâ€™s P, the maximum correlation was found in initial rock phosphate sample (r =88* for first order reaction, r =94* for second order reaction). Kinetics analysis of the obtained rock phosphate demonstrated that the PARP has more influence on phosphorus release pattern as compared to the inorganic P (SSP).

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“…After drying for 8 days, only on the surface of blanks containing 90 wt% sand, "down" appears. It consists of evaporation products of water soluble salts, which are present in clay and sand (see Table II) [36]. A characteristic feature of these blanks is the bad cohesion of sand particles due to the small content of montmorillonite in the composition.…”

Section: Preparation Of Blanksmentioning

confidence: 99%

Low-temperature sintering of high-siliceous clay under conditions of oxygen deficiency

et al. 2021

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In the work, the processes of phase reconstruction and properties of ceramics obtained from high-siliceous clay-sand, clay-cullet, and clay-sand-cullet mixtures are considered. It is possible to perform plastic molding of blanks from the given mixtures due to the presence of montmorillonite in clay and sand and sintering at 800 oC for 8 h under conditions of oxygen deficiency. Depending on the composition of the initial mixtures, specimens ranging in color from gray to black can be obtained. It has been established by the XRD, IR spectroscopy, and electron microscopy methods that the synthesized material is glass ceramics consisting of quartz, feldspars, and a glass phase. Depending on the content of the initial components in the mixtures, it is possible to obtain glass ceramics with high strength properties or coarse-pored glass ceramics whose properties are similar to those of foamed ceramics.

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STUDY OF SOME PARAMETERS TO OBTAIN THE P<SUB>2</SUB>O<SUB>5</SUB> WATER- SOLUBLE FROM PARTIALLY ACIDULATED PHOSPHATE ROCKS (PAPRs) BY SULFURIC ACID

Cited by 12 publications

References 8 publications

Appropriate Use of Local Phosphate Rock Increases Phosphorus Use Efficiency and Grain Yield of Sorghum and Cowpea in the Sudan Savanna

Appropriate Use of Local Phosphate Rock Increases Phosphorus Use Efficiency and Grain Yield of Sorghum and Cowpea in the Sudan Savanna

Partial acidulation of phosphate rock for enhanced phosphorus availability in alluvial soils of Bihar, India

Low-temperature sintering of high-siliceous clay under conditions of oxygen deficiency

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