scholarly journals Zinc availability for corn grown on an oxisol amended with flue dust

2006 ◽  
Vol 63 (6) ◽  
pp. 558-563 ◽  
Author(s):  
Gláucia Cecília Gabrielli dos Santos ◽  
Ronaldo Severiano Berton ◽  
Otávio Antônio de Camargo ◽  
Mônica Ferreira de Abreu
Keyword(s):  
Soil Ph ◽  
Agricultural Soils ◽  
Extraction Methods ◽  
Environmental Risks ◽  
Zinc Availability ◽  
Scheme Design ◽  
Flue Dust ◽  
Free Ion ◽  
Ph Conditions ◽  
Zn Availability

The costs related to the construction and maintenance of industrial landfills, and the environmental risks that they may represent, have increased the interest of several types of industries in studying the possibility of applying residues to agricultural soils. This study evaluates the efficiency of flue dust as a zinc source for corn, and the zinc availability for corn evaluated by four methods. A greenhouse experiment carried out at Campinas, SP, Brazil, evaluated the effect of two zinc sources (flue dust and zinc sulphate), at three rates (5, 50 and 150 mg dm-3), in one soil (Rhodic Hapludox) under two pH conditions (5.0 and 6.0). The treatments were arranged in a randomized factorial scheme design with three replications. Zinc availability indexes were determined by the pH 7.3 DTPA, Mehlich-1, and Mehlich-3 methods. The free Zn2+ activity in soil solution was calculated by the MINTEQ computer model. The extraction methods and the activity of the free ion Zn2+ were equally reliable to evaluate zinc availability in the soil amended with flue dust. More than 70% of the total Zn present in the saturation extract was in the free ion form, and the remainder was mainly complexed to SO4(2-) and OH-, independent of soil pH. Flue dust is a zinc supplier to plants. All tested methods were efficient in evaluating Zn availability for corn, independently of soil pH.

Effects of plastic mulch film residues on soil-microbe-plant systems under different soil pH conditions

Chemosphere ◽  
2020 ◽  
pp. 128901
Author(s):  
Yin Liu ◽  
Qing Huang ◽  
Wen Hu ◽  
Jiemin Qin ◽  
Yingrui Zheng ◽  
...  
Keyword(s):  
Soil Ph ◽  
Plastic Mulch ◽  
Soil Microbe ◽  
Mulch Film ◽  
Ph Conditions

scholarly journals USE OF HYDROGEN PEROXIDE AND PERCARBONATE TO TREAT CHLORINATED AROMATIC HYDROCARBON-CONTAMINATED SOIL

2014 ◽  
Vol 22 (1) ◽  
pp. 30-39 ◽  
Author(s):  
Marika Viisimaa ◽  
Anna Goi
Keyword(s):  
Hydrogen Peroxide ◽  
Soil Ph ◽  
Liquid Hydrogen ◽  
Natural Soil ◽  
Contaminant Removal ◽  
Contaminant Degradation ◽  
Solid Carrier ◽  
Liquid Carrier ◽  
Initial Ph ◽  
Ph Conditions

This study compared treatment methods that utilised a liquid carrier of hydrogen peroxide and a solid carrier, percarbonate, for p-dichlorobenzene, p-chloro-m-cresol and p-chlorothymol degradation in the soil. The targeted chlorinated aromatic contaminants in the soil degraded to a certain level when treated with the liquid hydrogen peroxide, but the removal efficacy was not dependent on the dosage. In contrast, an increase in the percarbonate dosage enhanced the contaminant removal. Supplementary ferrous iron was more effective for the treatment that employed the liquid carrier of hydrogen peroxide than the treatment employing the solid carrier. Although acidic pH conditions (initial pH of 2.5) favoured contaminant degradation using liquid hydrogen peroxide, the treatment involving percarbonate resulted in more effective contaminant removal without any soil pH preadjustment. Therefore, the solid carrier of hydrogen peroxide, percarbonate, was concluded to be an effective alternative to the liquid carrier, resulting in greater contaminant removal at natural soil pH values.

scholarly journals Characterization and Beneficiation Options for Tungsten Recovery from Yxsjöberg Historical Ore Tailings

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 895
Author(s):  
Jane Mulenshi ◽  
Pourya Khavari ◽  
Saeed Chehreh Chelgani ◽  
Jan Rosenkranz
Keyword(s):  
Environmental Impact ◽  
High Intensity ◽  
Extraction Methods ◽  
Environmental Risks ◽  
Magnetic Fraction ◽  
Drill Core ◽  
Valuable Metals ◽  
Process Flowsheet ◽  
Negative Environmental Impact ◽  
Knelson Concentrator

Repositories of historical tungsten mining tailings pose environmental risks, but are also potential resources for valuable metals. They still contain large tonnages of useful minerals and metals, reflecting the inefficient extraction methods and/or low metal prices at the time they were mined. The focus of this study is to evaluate the technical viability of reprocessing the tailings to recover some of the contained valuable minerals and metals, as well as reducing the negative environmental impact associated with the tailings. Geometallurgical studies were conducted on drill core samples taken from the Smaltjärnen tailings repository of the closed Yxsjöberg tungsten mine, Sweden. The collected samples were characterized physically, chemically, and mineralogically. Knelson concentrator dry low- and high-intensity magnetic separation methods were tested as potential beneficiation methods. The tailings are dominated by the −600 to +149 µm particles. The highest concentration of tungsten (W) was 0.22% WO3. Using a Knelson concentrator, scheelite (main W mineral) recovery was enhanced, with 75 wt.% tungsten recovered in the 34 wt.% heavy concentrate. Only 1.0 wt.% sulphur (S) reported to the non-magnetic fraction. Based on the findings, a methodology and a preliminary process flowsheet for reprocessing the tailings is proposed.

Study of Zn availability, uptake, and effects on earthworms of zinc oxide nanoparticle versus bulk applied to two agricultural soils: Acidic and calcareous

Chemosphere ◽  
2020 ◽  
Vol 239 ◽  
pp. 124814 ◽  
Author(s):  
Concepción García-Gómez ◽  
Sandra García-Gutiérrez ◽  
Ana Obrador ◽  
María Dolores Fernández
Keyword(s):  
Zinc Oxide ◽  
Agricultural Soils ◽  
Zinc Oxide Nanoparticle ◽  
Oxide Nanoparticle ◽  
Zn Availability

scholarly journals Evaluation of Biochar Nitrate Extraction Methods

2019 ◽  
Vol 9 (17) ◽  
pp. 3514 ◽  
Author(s):  
Jenna Walsh ◽  
Joseph Sanford ◽  
Rebecca Larson
Keyword(s):  
Extraction Method ◽  
Extraction Efficiency ◽  
Agricultural Soils ◽  
Extraction Methods ◽  
Multiple Methods ◽  
Soil Extraction ◽  
Future Studies ◽  
Different Types ◽  
Increasing Temperature ◽  
Biochar Amendment

Biochar amendment to soil is a method used to mitigate losses of nitrogen leaching through agricultural soils. Multiple methods for extraction of nitrogen have been used, and recent studies have indicated that traditional soil extraction methods underestimate biochar nitrate. This study evaluated the nitrate extraction efficiency of a KCl extraction method under different temperature (20 and 50 °C) and duration (24 and 96 h) conditions. Increasing the duration of extraction from 24 to 96 h did not have a significant impact on extraction efficiency. However, increasing temperature resulted in nitrate extraction efficiencies above 90%. Rinsing the biochar once with deionized (DI) water following filtration after extraction increased the extraction efficiency significantly, but any subsequent rinses were not significant. This study recommends extracting nitrate from biochar using 2 M KCl at 50 °C for a period of 24 h with one additional rinse to increase nitrate recovery above 90%. However, future studies should evaluate this procedure for different types of biochar produced from alternative biomasses and at varying temperatures.

Sicklepod (Cassia obtusifolia) Control in Soybean (Glycine max) Grown in Rotations of 97- and 18-cm Row Spacings

Weed Science ◽  
1989 ◽  
Vol 37 (6) ◽  
pp. 748-752 ◽  
Author(s):  
David R. Shaw ◽  
Clyde A. Smith ◽  
Charles E. Snipes
Keyword(s):  
Glycine Max ◽  
Soil Ph ◽  
Control Program ◽  
Control Measures ◽  
Effective Control ◽  
Row Spacing ◽  
Split Application ◽  
The Third ◽  
Ph Conditions ◽  
Narrow Row

Various 3-yr rotation sequences of 97- and 18-cm row spacings, with appropriate sicklepod control treatments within each row spacing, were implemented to evaluate sicklepod population and soybean yield at two locations. Alachlor plus metribuzin applied preemergence followed by either a postemergence-directed spray of metribuzin plus 2,4-DB or hand hoeing in 97-cm rows consistently reduced sicklepod populations. Reductions with 97-cm rows and preemergence-applied herbicides coupled with cultivation were not as great. At one location, using a split application of metribuzin preplant incorporated followed by preemergence with 18-cm rows reduced sicklepod populations if effective control measures had been used in wide rows the previous year, but the narrow-row treatments did not reduce sicklepod numbers if 18-cm rows had been used previously. Soil-applied metribuzin was more effective under high soil pH conditions, and sicklepod populations were reduced substantially whether the previous row spacing was 18 or 97 cm. After the third year, all plots were planted in 97-cm rows with no herbicides. No differences were found among sicklepod populations with any previous row spacing or sicklepod control program, indicating that, even with 3 yr of effective control, subsequent sicklepod populations were not affected.

CORN RESPONSE AND SOIL NITROGEN TRANSFORMATIONS FOLLOWING VARIED APPLICATION OF POULTRY MANURE TREATED TO MINIMIZE ODOR

1975 ◽  
Vol 55 (1) ◽  
pp. 29-34 ◽  
Author(s):  
K. A. MACMILLAN ◽  
T. W. SCOTT ◽  
T. W. BATEMAN
Keyword(s):  
Soil Ph ◽  
Dry Matter ◽  
Poultry Manure ◽  
Organic N ◽  
Nitrogen Transformations ◽  
Inorganic N ◽  
N Source ◽  
Soil Inorganic N ◽  
Ph Conditions ◽  
Soil Nitrogen Transformations

The response of corn (Zea mays L.) to manure that had been treated to minimize odor was investigated in a greenhouse trial with two silt loam soils of pH 4.2 and 7.1. Pretreatment of manure resulted in sources initially high in organic N and NH4+, but low in NO3−. One pretreatment gave high initial NO2− concentrations. In soil at pH 4.2, NH4+ was the major N source utilized by corn grown to 36 days, and dry matter yields were superior to those from soil at pH 7.1 where soluble NO3− was the major source of N. At pH 7.1, NO2− remained in significant quantities and decreased dry matter yields at 6 wk. Soil inorganic N concentrations varied between soils and was attributed to soil pH differences. Rate of NO2− disappearance decreased with increase in soil pH, and NH4+ accumulation increased with decrease in soil pH, whereas NO3+ production was favored by neutral pH conditions. Some NO3− production was observed in pH 4.2 soil after 36 days' incubation

scholarly journals Effect of DNA Extraction Method on the Apparent Microbial Diversity of Soil

2010 ◽  
Vol 76 (10) ◽  
pp. 3378-3382 ◽  
Author(s):  
Özgül İnceoǧlu ◽  
Eelco F. Hoogwout ◽  
Patrick Hill ◽  
Jan Dirk van Elsas
Keyword(s):  
Extraction Method ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Agricultural Soils ◽  
Extraction Methods ◽  
The Novel ◽  
Soil Dna ◽  
Dna Extraction Method ◽  
Gradient Gel Electrophoresis ◽  
Novel Method ◽  
Microbial Groups

ABSTRACT Four extraction methods, including a novel one, were compared for their efficiencies in producing DNA from three contrasting agricultural soils. Molecular analyses (PCR-denaturing gradient gel electrophoresis [DGGE] and clone libraries) focusing on different microbial groups were used as assessment criteria. Per soil, the DNA yields differed between extraction methods. Clear effects of method on apparent richness and community structure were found. Actinobacterial diversity based on soil DNA produced by two divergent methods revealed that a hitherto-undescribed group was obtained by the novel method.

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