scholarly journals Field Verification of Low-Level Biochar Applications as Effective Ameliorants to Mitigate Cadmium Accumulation into Brassica Campestris L from Polluted Farmland Soil

2021 ◽  
Author(s):  
Youchi Zhang ◽  
Yanwei Hou ◽  
Jiajun Fan ◽  
Shanna Lin ◽  
Brian J. Reid ◽  
...  
Keyword(s):  
Field Experiment ◽  
Brassica Campestris ◽  
Cadmium Accumulation ◽  
Application Rate ◽  
Pig Manure ◽  
Batch Adsorption ◽  
Cd Contamination ◽  
Rice Straw Biochar ◽  
Pyrolysis Unit ◽  
Rice Husk Biochar

Abstract Farmland soils in China have been reported to be diffusely contaminated, Cd has been recognized as a significant contributor to this issue and biochars have been reported to be effective in mitigating soil Cd pollution. However, previous studies have shown contradictory outcomes. Furthermore, in general, laboratory experiments and unrealistically large amounts of biochar (>10 t/ha) have been used. In this study, three biochars: rice straw biochar (RS), pig manure biochar (PM) and rice husk biochar (RH) were produced from readily available farm residues and characterized. These were used in a field experiment, at low applications rates of 1.8 and 3.6 t/ha, with rape (Brassica campestris L.). Batch adsorption experiments indicated Cd adsorption in the order RS biochar > PM biochar > RH biochar. Field experiment indicated biochar amendments to slightly changes in soil pH and CEC; yet led to considerable and significant decreases in extractable Cd concentrations (reductions of: 43%-51% (PM), 29%-35% (RS) and 17%-19% (RH)). Reduced extractable Cd correlated with lower Cd concentrations in rape plants. PM and RS biochars were the most effective in decreasing Cd phytoaccumulation into edible parts of rape (>68% reduction). It is highlighted that biochars were produced using a pyrolysis unit with an output of 20 ton/yr. Thus, assuming a working application rate of 2 ton/ha, the pyrolysis unit could service 10 ha/yr. While at a modest scale, this research demonstrates the genuine reality of biochar-based remediation solutions to contribute to the mitigation of diffuse Cd contamination in some of China’s impaired farmland.

scholarly journals A study of atrazine adsorption by using the rice straw synthesized adsorbent

2018 ◽  
Vol 192 ◽  
pp. 03035
Author(s):  
Thachanan Samanmulya ◽  
Pawinee Deetae ◽  
Patthranit Wongpromrat
Keyword(s):  
Surface Area ◽  
Rice Straw ◽  
Elemental Analysis ◽  
Pore Volume ◽  
Second Order ◽  
Batch Adsorption ◽  
Physico Chemical ◽  
Bet Analysis ◽  
Rice Straw Biochar ◽  
Pseudo Second Order

This study focused on adsorption of atrazine in adsorbent synthesized from Rice Straw. Rice Straw biochar were used in the study as they exhibited significantly high adsorption capacity for pesticide. Briefly, rice straw was pyrolysis at 600°C under nitrogen then biochar was modified using H3PO4. Biochar were characterized for their physico-chemical characteristics. The elemental analysis of biochar was performed using CHNS Analysis. The surface area and pore volume of adsorbents were estimated using the Brunauer, Emmett, and Teller (BET Analysis). In parts of Batch adsorption experiments was performed in range of room temperature and were divided to 2 parts. Part 1: Study of the kinetics adsorption was investigated using two models, namely, the pseudo-first-order and the pseudo-second-order models. Part 2: study of Adsorption isotherms. The results of CHNS analysis shows the elemental analysis that 51.795% of C, 0.763% of H, 1.634% of N and 0.654 % of S and the result of BET Analysis shows the surface area is 372.4 m2/g and pore volume of adsorbents is 0.315 cm3. From plotting between qt(mg/g) and time (t) shows the dynamics of the adsorption of atrazine onto the biochar at 15 ppm of initial atrazine concentrations. In general, atrazine was adsorbed quickly around 1-30 min. This could be due to fast mass transfer of solute from the solution to surface of adsorbent s as a result of concentration gradient of the solute. The study of the kinetics adsorption showed that the pseudo-second-order model best described the adsorption which agrees with chemisorption as the rate controlling mechanism.

scholarly journals Application of Biogas Digestate with Rice Straw Mitigates Nitrate Leaching Potential and Suppresses Root-Knot Nematode (Meloidogyne incognita)

Agronomy ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 227 ◽  
Author(s):  
Yuexi Wang ◽  
Seiya Chikamatsu ◽  
Tuya Gegen ◽  
Kozue Sawada ◽  
Koki Toyota ◽  
...  
Keyword(s):  
Rice Straw ◽  
Nitrate Leaching ◽  
Meloidogyne Incognita ◽  
Application Rate ◽  
Pig Manure ◽  
Test Plant ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Leaching Potential ◽  
Biogas Digestate

This study investigated the effects of biogas digestate application to soil with rice straw on nitrate leaching potential and nematicidal activity toward root-knot nematodes Meloidogyne incognita. The following seven treatments were set up: (i) control (CONT); (ii) chemical fertilizer (CF); (iii) wet biogas digestate derived from pig manure (WBD); (iv) and (v) dry biogas digestate derived from a mixture of pig manure and rice straw at an initial C/N ratio of 20 and 30 (DBD20 and DBD30); (vi) and (vii) DBD20 mixed with rice straw to adjust the C/N ratio to 16 (Mix1) and 30 (Mix2), respectively. The application rate of CF and digestates was adjusted to 200 mg N kg−1 soil based on the inorganic ammonium nitrogen contents. Nitrate contents readily increased in all the treatments with incubation, except for Mix2, and those at day 90 were decreased with increasing initial labile C contents. Garden balsam was grown as a test plant for root-knot nematodes using the soils at day 90 and the results showed that the gall index was significantly lower in Mix2 and Mix1 than in CF. These results suggest that dry digestate mixed with rice straw might have potential for lower nitrate leaching and nematicidal properties.

Potential Diffusion of Doramectin into a Soil Amended with Female Pig Manure. A Field Experiment

2011 ◽  
Vol 59 (19) ◽  
pp. 10635-10640 ◽  
Author(s):  
María Del Mar Gil-Díaz ◽  
Araceli Pérez-Sanz ◽  
Margarita Martín ◽  
Maria Carmen Lobo
Keyword(s):  
Field Experiment ◽  
Pig Manure ◽  
Potential Diffusion

Soil carbon, nitrogen and phosphorus contents in maize plots after 14 years of pig slurry applications

1997 ◽  
Vol 129 (2) ◽  
pp. 187-191 ◽  
Author(s):  
J. A. HOUNTIN ◽  
D. COUILLARD ◽  
A. KARAM
Keyword(s):  
Soil Depth ◽  
Application Rate ◽  
High Rate ◽  
Total Carbon ◽  
Pig Manure ◽  
Pig Slurry ◽  
Nitrogen And Phosphorus ◽  
Total N ◽  
Extractable P ◽  
Silty Loam

Excessive applications of liquid pig manure (LPM) could result in nutrient accumulation in the soil, thereby increasing the potential for plant nutrient losses through movement in groundwater. The objective of this work was to measure the concentrations of total carbon (Ct), total nitrogen (Nt), total phosphorus (Pt) and Mehlich-3 extractable-P (PM3) with depth in a Le Bras silty loam soil growing maize (Zea maize L.) under reduced tillage conditions. The soil was fertilized annually with various rates of LPM (0, 30, 60, 90 and 120 m3/ha) in four completely randomized blocks since 1979. In autumn 1992, twenty soil plots were sampled in increments of 20 cm to a depth of 1·0 m and analysed for total C, total N, total P and Mehlich-3 extractable-P. LPM application rate (R), soil depth (D) and the interaction R × D had highly significant (P<0·001) linear effects on Ct, Nt, Pt and PM3 concentrations throughout the 100-cm depth profiles. At all depths, Ct, Nt, Pt and PM3 contents increased with increasing rates of LPM application. The zone of maximum accumulation of Ct, Nt, Pt and PM3 concentrations occurred at the first 0–40 cm depth. A significant relationship was found between soil organic matter and Nt, Pt and PM3. Differences in N and P concentrations between manure rates are due to manure and maize. The increase in PM3 was generally greater for soil samples with high Pt content. Results from this study indicate that long-term application of a high rate of LPM leads to greater total C, N and P concentrations in the soil profile.

Efficacy of indigenous Steinernema abbasi and Heterorhabditis indica isolates as potential biocontrol agent against Holotrichia consanguinea Blanch. (Coleoptera: Scarabaeidae)

Nematology ◽  
2016 ◽  
Vol 18 (9) ◽  
pp. 1045-1052 ◽  
Author(s):  
Jagadeesh Patil ◽  
Vijayakumar Rangasamy ◽  
Abraham Verghese
Keyword(s):  
Field Experiment ◽  
Entomopathogenic Nematodes ◽  
Biocontrol Agent ◽  
Nematode Species ◽  
Application Rate ◽  
Multiplication Rate ◽  
Percentage Reduction ◽  
Heterorhabditis Indica ◽  
Potential Biocontrol Agent ◽  
Laboratory Assay

Holotrichia consanguinea is a serious pest of peanut and sugarcane that attacks other commercial crops in India. The efficacy of two species of entomopathogenic nematodes (EPN), Steinernema abbasi and Heterorhabditis indica, against H. consanguinea was tested under laboratory and field conditions. In a laboratory assay, H. indica caused significantly greater mortality (25-100%) than S. abbasi (20-80%) against second instars and H. indica caused 17.5-82.5% mortality in third-instar grub larvae, while S. abbasi caused (10-60%) mortality. These results revealed that second-instar grubs were more susceptible than third-instar grubs and efficacy of EPN against H. consanguinea varies with nematode species. The penetration and multiplication rate for H. indica was significantly higher than those of S. abbasi. Infective juveniles (IJ) of both nematode species and a commonly used insecticide (phorate) were tested against this insect in a field experiment. Field trail data showed that the percentage reduction in H. consanguinea grub population was significantly higher using H. indica at a dose of 2.5 × 109 IJ ha−1 than S. abbasi and phorate application. Phorate application was more efficient in reducing the grub population than both nematode species at the lower application rate (1.25 × 109 IJ ha−1). Overall, these experiments suggest that H. indica may be a promising biocontrol agent against H. consanguinea.

scholarly journals Removal of Cr (III) Ions from Wastewater using Sawdust and Rice Husk Biochar Pyrolyzed at Low Temperature

2016 ◽  
Vol 4 (4) ◽  
pp. 44-54 ◽  
Author(s):  
Sunethra Kanthi Gunatilake
Keyword(s):  
Functional Groups ◽  
Rice Straw ◽  
Active Sites ◽  
Adsorption Sites ◽  
Saw Dust ◽  
Optimum Ph ◽  
Intra Particle Diffusion ◽  
Rice Straw Biochar ◽  
Rice Husk Biochar ◽  
Complexation Mechanism

Sorption capacity of two different biochar (saw dust and rice straw) was evaluated in the recovery of chromium from wastewater. The optimum pH was 5-7 for recovery of Cr(III). Optimum yield was received after 1 hour contacting time with an adsorbent dose of 1 g/L and initial concentration was ∼20 mg/L. Cr(III) ions were transported to biochar surface through adsorption and intra-particle diffusion process. Langmuir and Freundlich kinetic parameters indicated that the affinity of the sorbent towards the uptake of Cr(III) ions and adsorptions were favorable. According to FTIR analysis of Cr(III) ions bound to active sites either electrostatic attraction or complexation mechanism. These results indicated that carbonyl, hydroxyl, amine and halides are the main adsorption sites in saw dust and rice straw biochar and these functional groups complexes with Cr(III) ions in the aqueous solution and changed the chemical environment of the functional groups in the biochar.

scholarly journals Rice Straw Biochar and Magnetic Rice Straw Biochar for Safranin O Adsorption from Aqueous Solution

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 186
Author(s):  
Do Thi My Phuong ◽  
Nguyen Xuan Loc
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Rice Straw ◽  
Batch Adsorption ◽  
Particle Diffusion ◽  
Order Kinetic ◽  
Magnetic Biochar ◽  
Intra Particle Diffusion ◽  
Rice Straw Biochar ◽  
Safranin O

This study investigates the adsorption of Safranin O (SO) from aqueous solution by both biochar and magnetic biochar derived from rice straw. Rice straw biochar (RSB) was made by pyrolysis in a furnace at 500 °C, using a heating rate of 10 °C·min−1 for 2 h in an oxygen-limited environment, whilst the magnetic rice straw biochar (MRSB) was produced via the chemical precipitation of Fe2+ and Fe3+. The physicochemical properties of the synthesized biochars were characterized using SEM, SEM- EDX, XRD, FTIR techniques, and N2 adsorption (77 K) and pHpzc measurements. Batch adsorption experiments were used to explore the effect of pH, biochar dosage, kinetics, and isotherms on the adsorption of SO. Experimental data of RSB and MRSB fit well into both Langmuir and Freundlich isotherm models, and were also well-explained by the Lagergren pseudo-second-order kinetic model. The maximum SO adsorption capacity of MRSB was found to be 41.59 mg/g, while for RSB the figure was 31.06 mg/g. The intra-particle diffusion model indicated that the intra-particle diffusion may not be the only rate-limiting step. The collective physical and chemical forces account for the adsorption mechanism of SO molecules by both RSB and MRSB adsorbents. The obtained results demonstrated that the magnetic biochar can partially enhance the SO adsorption capacity of its precursor biochar and also be easily separated from the solution by using an external magnet.

scholarly journals Rice husk and melaleuca biochar additions reduce soil CH4 and N2O emissions and increase soil organic matter and nutrient availability

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 1128
Author(s):  
Nam Tran Sy ◽  
Thao Huynh Van ◽  
Chiem Nguyen Huu ◽  
Cong Nguyen Van ◽  
Tarao Mitsunori
Keyword(s):  
Organic Matter ◽  
Rice Husk ◽  
Mekong Delta ◽  
Application Rate ◽  
N2o Emissions ◽  
Application Rates ◽  
Reduce Emissions ◽  
Local Water ◽  
Ch4 And N2o ◽  
Rice Husk Biochar

Background: Biochar is a promising material in mitigating greenhouse gases (GHGs) emissions from paddy fields due to its remarkable structural properties. Rice husk biochar (RhB) and melaleuca biochar (MB) are amendment materials that could be used to potentially reduce emissions in the Vietnamese Mekong Delta (VMD). However, their effects on CH4 and N2O emissions and soil under local water management and conventional rice cultivation have not been thoroughly investigated. Methods: We conducted a field experiment using biochar additions to the topsoil layer (0-20 cm). Five treatments comprising 0 t ha-1 (CT0); 5 t ha-1 (RhB5) and 10 t ha-1 (RhB10), and 5 t ha-1 (MB5) and 10 t ha-1 (MB10) were designed plot-by-plot (20 m2) in triplicates. Results: The results showed that biochar application from 5 to 10 t ha-1 significantly decreased cumulative CH4 (24.2 – 28.0%, RhB; 22.0 – 14.1%, MB) and N2O (25.6 – 41.0%, RhB; 38.4 – 56.4%, MB) fluxes without a reduction in grain yield. Increasing the biochar application rate further did not decrease significantly total CH4 and N2O fluxes but was seen to significantly reduce the global warming potential (GWP) and yield-scale GWP in the RhB treatments. Biochar application improved soil Eh but had no effects on soil pH. Whereas CH4 flux correlated negatively with soil Eh (P < 0.001; r2 = 0.552, RhB; P < 0.001; r2 = 0.502, MB). The soil physicochemical properties of bulk density, porosity, organic matter, and anaerobically mineralized N were significantly improved in biochar-amended treatments, while available P also slightly increased. Conclusions: Biochar supplementation significantly reduced CH4 and N2O fluxes and improved soil mineralization and physiochemical properties toward beneficial for rice plant. The results suggest that the optimal combination of biochar-application rates and effective water-irrigation techniques for soil types in the MD should be further studied in future works.

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