Magnesium deficiency in Douglas-fir and Grand fir growing on a sandy outwash soil amended with sewage sludge

Harrison, Robert; Henry, Charles L.; Xue, Dongsen

doi:10.1007/bf01100397

Cited by 23 publications

(12 citation statements)

References 14 publications

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“…The BS used in this research were 1.7% N and had relatively low C/N ratios of 10/1 and so were likely to stimulate N mineralization and microbial activity (McGill and Cole, 1981). Like others, we found BS to decrease soil pH (Harrison et al, 1994), which in these alkaline soils may be beneficial for nutrient availability and tree growth. We suspect the decrease in pH with BS was in part derived from H + transfer processes associated with N mineralization and microbial respiration (Van Breemen et al, 1983).…”

Section: Discussionsupporting

confidence: 86%

Biochar and Biosolids Increase Tree Growth and Improve Soil Quality for Urban Landscapes

et al. 2013

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Urban soil quality is often degraded and a challenging substrate for trees. This study was conducted to assess the impacts of biochar (BC), biosolids (BS), wood chips (WC), compost (COM), aerated compost tea (ACT), and a nitrogen plus potassium fertilizer (NK) for improving three typical urban soils and tree sapling growth. Across the three soil types, the most significant changes in soil properties were observed with BS and BC. Biosolids decreased soil pH and increased available N, N mineralization, and microbial respiration. Biochar increased total organic C. Increases in microbial respiration were also observed with NK, COM, and WC in only the sand soil. Leachate concentrations of dissolved organic C were greater with BS and COM, but nitrate in leachates did not differ among the treatments. The greatest and most significant increases in and growth were found with BS and BC. Tree growth was modeled from plant-available N and microbial respiration. The N content in the treatments appeared to be a strong determinant of tree growth for all treatments except BC. Nitrogen fertilizer, COM, and WC are the most common urban soil amendments and mulches in use today. This study provides evidence that BS and BC are acceptable, and possibly preferred, alternatives for improving urban soil quality and tree growth.

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Section: Discussionsupporting

confidence: 86%

Biochar and Biosolids Increase Tree Growth and Improve Soil Quality for Urban Landscapes

et al. 2013

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“…Interference of Cu and Cd with the root uptake of mineral nutrients has been observed [55, 56]. Moreover, antagonistic effects of Cu and Fe have been suggested by many workers and often occur in plants grown under Cu toxicity [17, 57–59].…”

Section: Resultsmentioning

confidence: 99%

The Effects of Excess Copper on Antioxidative Enzymes, Lipid Peroxidation, Proline, Chlorophyll, and Concentration of Mn, Fe, and Cu inAstragalus neo-mobayenii

Karimi

Khavari-Nejad

Niknam

et al. 2012

The Scientific World Journal

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To probe the physiological and biochemical tolerance mechanisms in Astragalus neo-mobayenii Maassoumi, an endemic plant around the Cu-rich areas from the North West of Iran, the effect of different copper concentrations at toxic levels on this plant was investigated. Copper was applied in the form of copper sulfate (CuSO4 ·5H2O) in four levels (0, 50, 100, and 150 μM). We observed no visible symptoms of Cu toxicity in this plant species. During the exposure of plants to excess copper, the antioxidant defense system helped the plant to protect itself from the damage. With increasing copper concentration, superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities increased in leaves and roots (P < 0.001) compared with that of the control group. The chlorophyll amount gradually declined with increasing Cu concentrations. However, reduction in the 50 μM level showed insignificant changes. Enhanced accumulation of proline content in the leaves was determined, as well as an increase of MDA content (oxidative damage biomarker) (P < 0.001). The results indicated that Cu contents in leaves and roots enhanced with increasing levels of Cu application. The Fe and Mn contents in both shoots and roots significantly decreased with increasing Cu concentration. Finally, the mechanisms of copper toxicity and copper tolerance in this plant were briefly discussed.

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“…For the more acidic forest soil, the leachate from the SF had lower hardness than the source water with no change in the MBR water. It is possible that the low pH in the forest soil is associated with depleted cations, and irrigation with reclaimed water may provide a source of cations for soil adsorption sites (Harrison et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

Impact of Soil Filtration on Metals, Nutrients, and Estrogenic Activity of Reclaimed Water

Singer

Brown

2018

J of Env Quality

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This study examined the impact of soil filtration on water quality for reclaimed water from two municipal wastewater treatment processes with two soils (forest and farm). Soils were watered for 16 wk. Nutrients (NO3–N, NH3–N, and PO4−3), electrical conductivity, hardness, pH, total metals, and estrogenic activity in source and effluents were measured. Results were evaluated in reference to current regulations in Washington State. Both reclaimed waters met standards for unrestricted agricultural use but did not meet current state regulations for ecological use. Metal concentrations in reclaimed waters were generally similar to the control (tap water). Both source and soil filtered water met Washington State stream water criteria for chronic exposure for As but exceeded groundwater standards. Concentrations of Cd, Pb, Ag, and Zn in the effluents were similar or slightly elevated to reclaimed source water for both soils and water types. Soil filtration improved water quality to levels within Washington State regulatory limits for ecological use for Cd, Cu, and Zn but decreased water quality for Pb for both soil and reclaimed water types. Phosphate concentrations were reduced by soil filtration, but NO3− concentrations were increased for both soils and all water types above source water concentrations. The estrogenic activity of the sand‐filtered water decreased to near detection limits in the forest soil and by >200% in the farm soil. The degradation in water quality (increased NO3−, As, and Mn) after soil filtration observed in this study would likely occur with any water type, including rainwater. Core Ideas Irrigation with reclaimed water can augment stream flows through subsurface flow. Filtration through soil can improve or degrade the chemical characteristics of the water. We found marked reductions in estrogenic activity for reclaimed water filtered through soil. Total and available metal concentrations were similar in water before and after soil filtration.

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Magnesium deficiency in Douglas-fir and Grand fir growing on a sandy outwash soil amended with sewage sludge

Cited by 23 publications

References 14 publications

Biochar and Biosolids Increase Tree Growth and Improve Soil Quality for Urban Landscapes

Biochar and Biosolids Increase Tree Growth and Improve Soil Quality for Urban Landscapes

The Effects of Excess Copper on Antioxidative Enzymes, Lipid Peroxidation, Proline, Chlorophyll, and Concentration of Mn, Fe, and Cu inAstragalus neo-mobayenii

Impact of Soil Filtration on Metals, Nutrients, and Estrogenic Activity of Reclaimed Water

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