Revisiting soil texture analysis: Practices towards a more accurate Bouyoucos method

Mwendwa, S.M

doi:10.1016/j.heliyon.2022.e09395

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…The P Total was determined by the vanado-molybdate yellow method after the digestion of soil samples with hydrochloric acid. The soil texture analysis was performed according to Robinson’s pipette method as described by Mwendwa [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

Isolation, Identification, and Characterization of Phosphate-Solubilizing Bacteria from Tunisian Soils

Amri

Rjeibi

Gatrouni³

et al. 2023

Microorganisms

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Soil microorganisms play an important role in maintaining natural ecological balance through active participation in carbon, nitrogen, sulfur, and phosphorous cycles. Phosphate-solubilizing bacteria (PSB) are of high importance in the rhizosphere, enhancing the solubilization of inorganic phosphorus complexes into soluble forms available for plant nutrition. The investigation of this species of bacteria is of major interest in agriculture, as they can be used as biofertilizers for crops. In the present study, 28 isolates of PSB were obtained after the phosphate enrichment of soil samples from five Tunisian regions. Five PSB species were identified by 16S rRNA gene sequencing including Pseudomonas fluorescens, P. putida, and P. taiwanensis, Stenotrophomonas maltophilia, and Pantoea agglomerans. Solid and liquid Pikovskaya’s (PVK) and National Botanical Research Institute’s (NBRIP) media containing insoluble tricalcium phosphate were used for the evaluation of the phosphate solubilization ability of the bacterial isolates by two methods: visual evaluation of the solubilization zone around colonies (halo) and determination of solubilized phosphates in liquid medium by the colorimetric method of the vanado-molybdate yellow. Based on the results of the halo method, the isolate of each species that showed the higher phosphate solubilization index was selected for evaluation of phosphate solubilization by the colorimetric method. In the liquid media, the bacterial isolates showed phosphate solubilization ranging from 535.70 to 618.57 µg mL−1 in the NBRIP medium, and 374.20 to 544.28 µg mL−1 in the PVK medium, with the highest values produced by P. fluorescens. The best phosphate solubilization ability and higher reduction in broth pH, which indicates higher organic acid production, were achieved in NBRIP broth for most of the PSB. Strong correlations were observed between the average capability of PSB to solubilize phosphates and both the pH and total phosphorous content in the soil. The production of the hormone indole acetic acid (IAA), which can promote plant growth, was observed for all five PSB species. Among them, P. fluorescens obtained from the forest soil of northern Tunisia showed the highest production of IAA (50.4 ± 0.9 µg mL−1).

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Section: Methodsmentioning

confidence: 99%

Isolation, Identification, and Characterization of Phosphate-Solubilizing Bacteria from Tunisian Soils

Amri

Rjeibi

Gatrouni³

et al. 2023

Microorganisms

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“…The soil bulk density and the saturated hydraulic conductivity were measured using the cylindrical core method and the falling head core method, respectively (Hao et al, 2008; Reynolds, 2008). It should be noted that the aforementioned methods were previously investigated and accepted as standard methods in soil and water studies due to their demonstrated accuracy (Mwendwa, 2022; Page‐Dumroese et al, 1999; Pedescoll et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Field study of irrigation strategies with treated wastewater and saline water on heavy metal accumulation in barley grain

Shahidi,

Khashei‐Siuki,

Bagheri

et al. 2023

Water Environment Research

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This study examines the effects of three irrigation regimes with a combination of saline water and treated wastewater on the accumulation of heavy metals in barley grains. A field experiment was designed as a split‐split plot arrangement in a randomized complete block design, in which treatments were different irrigation regimes (50, 70 and 100% full irrigation) and irrigation water types (saline water (SW), treated wastewater (TW), mixed water resources (MWR) and alternative irrigation (AI)). After cultivation and harvesting of the barley crop, the grain yield, 1000‐grain weight and contents of heavy metals in the grains were measured. The grain yield was enhanced by TW alone, MWR and AI to 12.8, 5 and 9.5% under 70%‐deficit irrigation, and 58.3, 21.7 and 8.7% under full irrigation, respectively. Based on the guidelines for safe limits of heavy metals in edible plants and livestock feed, the barley grains were safe for livestock and toxic for humans. The trend of heavy metal contents in the grains was Fe>Zn>Pb>Cu≥Cr>Cd. Irrigation with saline water compared to treated wastewater increased Fe, Cu, Zn, Pb, Cd and Cr contents in the grains to 11.75, 10.97, 5.22, 19.15, 3.45 and 9.21%, respectively. The amounts of toxic elements of Cd and Pb were maximized by using MWR, while the Cr content in the grain was maximized by using AI. There were no significant difference in the metal uptake by the grains among all irrigation regimes in any irrigation water resource. However, compared to the other irrigation regimes, the full irrigation resulted in lower Zn, Cu and Cd contents, while the 50%‐deficit irrigation led to lower Pb and Cr contents in the grains. Therefore, irrigation with TW is recommended based on the grain yield, while AI is suggested due to lower Cu, Pb and Cd contents in the grain, and MWR is recommended due to lower Cr content. Furthermore, full and 50%‐deficit irrigation regimes are recommended to respectively maximize grain yield and minimize the toxic metal contents in the grain.

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“…In saturated soil paste, the pH of the soil was determined, and EC was analyzed in its extracts (Aboukila and Norton 2017). The hydrometer method measured the soil texture (Mwendwa 2022). The amount of calcium carbonate (CaCO3) in the soil was ascertained using the calcimeter (Erskine et al 2017 ).…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

The influence of nZVI composites as immobilizing agents on the bioavailability of heavy metals and plant growth in mining metal-contaminated soil

2024

Global NEST Journal

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<p>Under the greenhouse scale, nano zero valent iron (nZVI) have been evaluated evaluated by formulation with carboxymethyl cellulose (CMC-nZVI), chitosan (Ch-nZVI), biochar (BC-nZVI), and smectite (SC-nZVI) at rates of 0 and 0.5 and 1% (w/w). The properties of manufactured compounds and their impact on the soil ecosystem planted with safflower (Carthamus tinctorius L.) as a phytoremediation crop for inorganic contaminants in contaminated mining soils have been measured. After 33 days, growth parameters were recorded in harvested plants and the concentrations of some HMs in plant tissues. Furthermore, pH, EC, soluble Na and available Cd, Cu, Pb and Zn concentrations in the treated soil after harvest were analyzed. Results revealed that Ch-nZVI and SC-nZVI application at 0.5% led to a narrow non-significant increase in the dry biomass and the shoot length compared to the control. On the other hand, the application of CMC-nZVI and BC-nZVI resulted in reduced plant growth. All the applied amendments increased soil pH, EC, and soluble Na contents. The soils treated with synthesized nZVI composites showed a considerable increase (non-significant) in available heavy metals in treated soils compared to control. Application of CMC-nZVI1% resulted in increased shoot copper (Cu) and zinc (Zn) (182% and 114%, respectively, compared to control), while Ch-nZVI, SC-nZVI applied at 1%, and BC-nZVI0 applied at 5% resulted in reduce Cu, Zn, and Pb concentrations in roots by 65.2%, 31.4% and 85.5% in Cu, Zn and Pb respectively as compared to control). The phytoremediation indices showed that the uptake and extraction of HMs by safflower plants weren't significant in decreasing heavy metals in polluted soil and the applied materials disabled the actions of hyperaccumulated plant used. Results showed that these materials didn’t have a significant effect on immobilize of HMs in mining soil, while the application of Ch-nZVI, SC-nZVI, and BC-nZVI resulted in disabled hyperaccumulated plant to reducing the uptake of Pb, Cu, and Zn. It could be concluded that the application of synthesized nZVI composites to mining polluted soil might be restricted, mainly due to their negative impacts on soil ecosystem besides their side effects on HMs uptake by test hyperaccumulated crop.</p>

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Revisiting soil texture analysis: Practices towards a more accurate Bouyoucos method

Cited by 19 publications

References 15 publications

Isolation, Identification, and Characterization of Phosphate-Solubilizing Bacteria from Tunisian Soils

Isolation, Identification, and Characterization of Phosphate-Solubilizing Bacteria from Tunisian Soils

Field study of irrigation strategies with treated wastewater and saline water on heavy metal accumulation in barley grain

The influence of nZVI composites as immobilizing agents on the bioavailability of heavy metals and plant growth in mining metal-contaminated soil

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