Kinetics of phosphate release from soil and its uptake by wheat

SummaryLaboratory and glasshouse experiments were conducted to study P release kinetics and uptake of P by wheat (Trilicum, aestivum L.) in ten benchmark soils of Punjab (India). Phosphorus desorption, determined by successive extraction with 0·01 m-CaCl2 solution, was lower in calcareous soils (group I) than in non-calcareous soils (group II). Desorption of surface P in soils followed pseudo-first-order kinetics. The values of the kinetic constant of desorption and the radial diffusion coefficient of P increased with the amount of added P in soils.A significant linear relationship between cumulative desorbed P and both dry-matter yield and P uptake indicated that the rate of release of P from the solid matrix is important in determining P uptake by wheat crop. Phosphate uptake was less dependent on the initial solution P concentration than on the rate of phosphate release.

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Copper release kinetics: Effect of two extractants and wheat (Triticum aestivum L.) rhizosphere

Plant Soil and Environment ◽

10.17221/365/2012-pse ◽

2012 ◽

Vol 58 (No. 10) ◽

pp. 471-476 ◽

Cited By ~ 3

Author(s):

H.R. Motaghian ◽

A.R. Hosseinpur

Keyword(s):

Citric Acid ◽

Release Kinetics ◽

Calcareous Soils ◽

Triticum Aestivum L ◽

First Order ◽

Rhizosphere Soils ◽

Copper Release ◽

Successive Extraction ◽

The Mean ◽

Kinetics Of

The greenhouse experiment was performed to determine Cu release characteristics in the bulk and the rhizosphere of some calcareous soils using rhizobox. The kinetics of Cu release in the bulk and the rhizosphere soils were determined by successive extraction with diethylenetriaminepentaacetic acid-triethanolamine (DTPA-TEA) and 10 mmol/L citric acid in a period of 1 to 504 h at 25 ± 1°C. The results of kinetics study showed that Cu extracted using DTPA-TEA in the rhizosphere soils was significantly (P < 0.01) lower than the bulk soils, while Cu extracted using citric acid in the rhizosphere soils was significantly (P < 0.01) higher than the bulk soils. The mean of released Cu after 504 h using DTPA-TEA were 8.59 and 7.46 mg/kg in the bulk and the rhizosphere soils, respectively. The mean release of Cu after 504 h using citric acid was 14.73 and 16.05 mg/kg in the bulk and the rhizosphere soils, respectively. Release kinetics of Cu in two extractants conformed fairly well to parabolic diffusion, power function, and first order equations. The results of correlation analysis illustrated that a significant correlation between Cu desorption after 504 h with citric acid and Cu concentration in wheat was found (r = 0.96 and r = 0.90 in the rhizosphere and the bulk soils, respectively, P < 0.01). Therefore, application of 10 mmol/L citric acid extractant would be recommended in the future study on the kinetics of release of Cu in calcareous soils.  

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Potassium release kinetics and its correlation with pinto bean (Phaseolus vulgaris) plant indices

Plant Soil and Environment ◽

10.17221/70/2012-pse ◽

2012 ◽

Vol 58 (No. 7) ◽

pp. 328-333 ◽

Cited By ~ 16

Author(s):

A.R. Hosseinpur ◽

H.R. Motaghian ◽

M.H. Salehi

Keyword(s):

Release Kinetics ◽

Calcareous Soils ◽

Bean Plant ◽

Pinto Bean ◽

Successive Extraction ◽

Release Studies ◽

Function Models ◽

Kinetics Of ◽

Total Reaction Time ◽

K Release

The rate of potassium (K) release from soils is a dynamic process, and it is important to the evaluation of soil K availability to plant. The objectives of this study were to determine K release characteristics and the correlation of these parameters with bean plant indices in surface soils of 15 calcareous soils. The kinetics of K release was determined by successive extraction with 0.01 mol/L CaCl<sub>2</sub> in a period of 2–2017 h at 25 ± 1°C. The results showed that the cumulative K&rlm; release ranged from 111 to 411 mg/kg. A plot of cumulative amount of K released showed a discontinuity in slope at 168 h. Thus, two equations were applied to segments of the total reaction time (2 to 168 and 168 to 2017 h). The amounts of K released during 2–168 and 168–2017 h ranged from 55 to 299 and 44 to 119 mg/kg, respectively. Release kinetics of K conformed fairly well to parabolic diffusion, simplified Elovich and power function models in two segments. Potassium released after 2–168 and 168–2017 h and K release rate constants were significantly correlated (P < 0.05) with bean plant indices, while correlation between K extracted by using 1 mol/L NH<sub>4</sub>OAc (ammonium acetate) and plant indices was not significant. The results of this research showed that information obtained from K release studies in laboratory and kinetics equation parameters can help to estimate the K supplying power of soils.  

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Release Kinetics of Nonexchangeable Potassium in Calcareous Soils

Communications in Soil Science and Plant Analysis ◽

10.1081/css-200062490 ◽

2005 ◽

Vol 36 (13-14) ◽

pp. 1903-1917 ◽

Cited By ~ 44

Author(s):

Mohsen Jalali

Keyword(s):

Release Kinetics ◽

Calcareous Soils ◽

Kinetics Of ◽

Nonexchangeable Potassium

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Release kinetics and distribution of boron in different fractions in some calcareous soils

Environmental Earth Sciences ◽

10.1007/s12665-012-2204-z ◽

2013 ◽

Vol 70 (3) ◽

pp. 1169-1177 ◽

Cited By ~ 6

Author(s):

F. Ranjbar ◽

M. Jalali

Keyword(s):

Release Kinetics ◽

Calcareous Soils

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Factors affecting potassium release in calcareous soils of southern Iran

Soil Research ◽

10.1071/sr11098 ◽

2011 ◽

Vol 49 (6) ◽

pp. 529 ◽

Cited By ~ 13

Author(s):

Mahdi Najafi Ghiri ◽

Ali Abtahi ◽

Fatemeh Jaberian

Keyword(s):

Release Rate ◽

Soil Depth ◽

Release Kinetics ◽

Calcareous Soils ◽

Reaction Rates ◽

Climatic Conditions ◽

Factors Affecting ◽

Southern Iran ◽

K Release Rate ◽

K Release

Experiments were conducted on 48 representative surface and subsurface soils collected from different climatic and physiographic conditions in southern Iran to assess factors affecting potassium (K) release and to find the best fitting models to describe the release kinetics of K to 0.01 m CaCl2. Mineralogical analysis showed that smectite, mica, chlorite, and palygorskite were the main clay minerals in the studied soils, whereas quartz, mica, and feldspars were abundant in the silt and sand fractions. Results indicated that cumulative K released ranged from 26.7 to 260 mg/kg (mean 176 mg/kg) for surface soils and from 37.9 to 198 mg/kg (mean 130 mg/kg) for subsurface soils. The predominant source of K in the soils appeared to be mica, because there was a significant relationship between cumulative K released and mica content. The percentage of non-exchangeable K release to CaCl2 during 1496 h was also correlated with the ratio of mica in the coarse fractions to total mica in the whole soil. Results showed that the Elovich equation adequately described the reaction rates of K release from surface and subsurface soils and suggested a heterogeneous diffusion process. We concluded that mica content and its particle size, soil depth, and some soil properties are the main factors controlling K release rate. On the other hand, we found no significant relationships between K release rate and climatic conditions, or physiographic positions.

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Microparticles Immobilized Tamarindus Indica Extract Bioremediates Toxic Chromium in Tannery Effluent and Contaminated Soil

10.21203/rs.3.rs-142360/v1 ◽

2021 ◽

Author(s):

Babangida Sanusi Katsayal ◽

Aliyu Muhammad ◽

Ambi Ahmed ◽

Abdullahi Balarabe Sallau

Keyword(s):

Contaminated Soil ◽

Contaminated Soils ◽

Waste Treatment ◽

Release Kinetics ◽

Kinetic Constant ◽

Release Kinetic ◽

Tannery Effluent ◽

Reduction Potentials ◽

Reduction Capacity ◽

Very High

Abstract Bioreduction of certain environmental toxic metals using plant-derived antioxidants has been proven effective and promising bioremediation approach. The Redox state of specific metals, in particular chromium, determines its environmental solubility and toxicity. Antioxidant-rich extract of tamarind leaves was extracted and its Cr(VI) reduction potentials in tannery effluent and Cr(VI) contaminated soil determined under acidic and neutral pHs. Microparticles immobilized tamarind extract were produced and similarly tested for Cr(VI) reduction capacity in tannery effluent and contaminated soil. The particles were initially characterized to evaluate their physicochemical properties, encapsulation efficiency as well as release kinetics. The particles produced were irregular in shape with a very high extract adsorption efficiency (87.06%). The particles shows high release kinetic constant and a lower half-life. About, 50 and 60% Cr(VI) reduction was achieved by tamarind extract immobilized microparticles in tannery effluent and 60 and 80% in Cr(VI) contaminated soil after 4hrs at pH 6.7 and 2.0, respectively. Cr(VI) in tannery effluent and contaminated soils was efficiently reduced and immobilization enhanced and preserved the extract effectiveness for a longer period of time. Therefore, immobilization of antioxidant-rich extract into microparticles was found to be essential in attaining maximum Cr(VI) reduction. Therefore, findings from this work could be very helpful in industrial waste treatment and environmental cleanliness.

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Phosphorus desorption from calcareous soils with different initial Olsen-P levels and relation to phosphate fractions

Journal of Soils and Sediments ◽

10.1007/s11368-019-02292-9 ◽

2019 ◽

Vol 19 (7) ◽

pp. 2997-3007 ◽

Cited By ~ 3

Author(s):

Yan Shen ◽

Yinghua Duan ◽

Neil McLaughlin ◽

Shaomin Huang ◽

Doudou Guo ◽

...

Keyword(s):

Calcareous Soils ◽

Olsen P ◽

Phosphorus Desorption

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Transformation of phosphorus in highly calcareous soils under field capacity and waterlogged conditions

Soil Research ◽

10.1071/sr11250 ◽

2012 ◽

Vol 50 (3) ◽

pp. 249 ◽

Cited By ~ 7

Author(s):

E. Adhami ◽

A. Ronaghi ◽

N. Karimian ◽

R. Molavi

Keyword(s):

Calcareous Soils ◽

Hydroxylamine Hydrochloride ◽

Field Capacity ◽

Inorganic Phosphorus ◽

Influential Factors ◽

Moisture Regime ◽

P Fractions ◽

Waterlogged Condition ◽

Successive Extraction ◽

Moisture Regimes

The aim of the present study was to evaluate the transformation of applied inorganic phosphorus (P) in highly calcareous soils under two moisture regimes. The experimental design was a factorial combination of two rates of P (0 and 300 mg P kg–1 as KH2PO4) and two moisture regimes (field capacity, FC; waterlogged, WL) in a completely randomised design in duplicate with 20 surface soil samples. The fractionation sequence of inorganic P included successive extraction with NaHCO3, NH4 acetate buffer (NH4OAc), MgCl2, NH4F, NaOH–Na2CO3 (HC), Na citrate–bicarbonate–dithionite (CBD), and H2SO4 carried out 80 and 160 days after incubation. Recovery of applied P in each fraction was calculated as the difference between samples treated and untreated with P. Results indicated that NaHCO3-P decreased from 80 to 160 days, and the decrement was higher under WL than FC moisture regime. The NH4OAc-P was lower under WL than FC at 160 days, while P associated with free and crystalline Fe and Al oxides (NH4F-P, HC-P, CBD-P) was higher under WL than FC for both incubation periods. Oxalate-, citrate-, and citrate–ascorbate-extractable iron under FC and in conjunction with oxalate- and CBD-extractable aluminium and quinone- and hydroxylamine–hydrochloride-extractable manganese were the most influential factors regulating all P fractions. Results of the present study revealed that transformation of applied P into Al- and Fe-P fractions is not as low as previously reported in highly calcareous soils and that Al- and Fe-P oxides may be important in P transformation of these soils, especially in waterlogged condition.

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Phosphate fertiliser residues in wheat-growing soils of the Western Downs, Queensland

Soil Research ◽

10.1071/s96038 ◽

1997 ◽

Vol 35 (2) ◽

pp. 341 ◽

Cited By ~ 4

Author(s):

W. M. Strong ◽

E. K. Best ◽

J. E. Cooper

Keyword(s):

Field Experiments ◽

Moisture Stress ◽

P Uptake ◽

Residual Effects ◽

Wheat Crop ◽

Soil Test ◽

Phosphate Fertiliser ◽

Plant Moisture ◽

Field Plots ◽

Extractable Soil

Effects of repeated annual application and residual effects of past phosphorus (P) applications were studied at Billa Billa and The Gums, Queensland, on 2 Vertisols representative of a large cropping area in this region. Phosphorus was applied annually at 0, 4, 8, 12, and 25 kg/ha at sowing to each wheat crop between 1978 and 1988. Phosphorus was also applied at 25, 50, 100, 200, or 400 kg/ha as a once-only application, before wheat was sown in 1978, and was incorporated by tillage. Pot experiments were conducted each year with soil (6 kg/pot) gathered from field plots in May before wheat sowing to determine the residual value (RV) of previously applied P fertiliser under standard conditions of frequent watering. In 1979 the RV was determined in a second series of pots with a water deficit to simulate conditions of plant moisture stress that were to dominate the field experiments. The RV of P fertiliser was reduced to one-third that determined under well-watered conditions. Low residual values (8–47%) determined in the field in 1979 for P rates 25 and 50 kg/ha applied in 1978 were probably due to reduced P uptake from dry topsoil throughout which P residues were incorporated by tillage. By contrast, P applied annually at a low rate (4 or 8 kg/ha) in a band close to seeds created profitable responses when evaluated over the sequence of successive wheat crops. The bicarbonate-extractable soil test value (Pbf) on either soil fertilised annually for n years with P at a rate R (kg/ha· year) was described by the model where Pbu is the soil test value (mg/kg) of unfertilised soil.

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