DGT technique to assess P mobilization from greenhouse vegetable soils in China: A novel approach

Kalkhajeh, Yusef Kianpoor; Sørensen, Helle; Huang, Biao; Guan, Dong-Xing; Luo, Jun; Hu, Wenyou; Holm, Peter E.; Hansen, Hans Christian Bruun

doi:10.1016/j.scitotenv.2018.02.228

Cited by 23 publications

(11 citation statements)

References 34 publications

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“…It has further been stated that, while the DGT method may accurately depict the amount of P immediately in solution, it may not always correlate well to plant performance as plant-mediated dissolution processes are not taken into account [23,24]. While the DGT method is described as an accurate method for the determination of plant-available P even at low concentrations in various soil types [9,25], our study only determined DGT available P after the addition of highly soluble P species, which may indicate the limits of the method when applied to soils that show both low P concentrations as well as a high sorption capacity, as indicated through the CAL and Olsen methods.…”

Section: Comparison Of Extraction Methodsmentioning

confidence: 99%

Sensitivity of Three Phosphate Extraction Methods to the Application of Phosphate Species Differing in Immediate Plant Availability

et al. 2019

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Extractive tests for determining the plant-availability of soil phosphorus (P) give varying results due to the inherently different characteristics of the extraction solution. Generally, classical soil P tests such as the Olsen or calcium acetate/lactate (CAL) method do not give an indication on the total amount of plant available P, but merely give an indication of the equilibrium between soil and extraction solution. It is also not entirely clear which fractions of P are directly determined through the various methods of extraction, i.e., determined P must not be immediately plant available, as is the case for rock phosphate. It is therefore possible that extraction methods either over or under estimate the amount of P available for plant consumption. In this research, we compared three methods of soil P determination (CAL, Olsen and diffusive gradients in thin films (DGT)) with regards to their ability to determine P species (Ca(H2PO4)2, CaHPO4, Ca3(PO4)2 and Inositol-6-hexakisphosphate) added to soils of high sorption capacity, immediately after as well as two weeks after application. For each of the methods, it could be shown that sorption processes in the soil immediately (0 days incubation) fix P to a point where it is not extractable through any of the described methods. These sorption processes continue over time, leading to a further decrease of determined P. The acidic CAL extraction method gives higher results of extractable P compared to the Olsen method. Due to the extraction of Ca3(PO4)2, the CAL method may overestimate immediately plant-available P. The most suitable methods for the determination of immediately plant available P may therefore be the Olsen and DGT methods. Organic IP6 is not determined by any of the extraction methods. At low concentrations of soil P, the DGT method may fail to give results.

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Section: Comparison Of Extraction Methodsmentioning

confidence: 99%

Sensitivity of Three Phosphate Extraction Methods to the Application of Phosphate Species Differing in Immediate Plant Availability

et al. 2019

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“…Soil changes affect the substrate (Zhang et al, 2019) as well as crop yield and quality (Chen et al, 2017) and can also cause environmental problems, such as water pollution (He, 2006;Heredia and Cirelli, 2007;Ju et al, 2007;Kalkhajeh et al, 2018) and ecological destruction. Earlier study has shown that when soil Olsen-P exceeds 60 mg/kg, P in drainage water increases to more than 2 mg/L (Heckrath et al, 1995).…”

Section: Soil Change Strategies In Lhasamentioning

confidence: 99%

Investigating the Effects of Greenhouse Vegetable Cultivation on Soil Fertility in Lhasa, Tibetan Plateau

2020

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The area of land utilized for growing vegetables in greenhouses has expanded rapidly on the Tibetan Plateau over recent decades. However, the effects of greenhouses on soil fertility as well as variations in these effects between the plateau and plain remain unclear on the Tibetan Plateau. This study assessed the effects of vegetable greenhouses in the vicinity of Lhasa, using open field soil as a control. A total of 92 plough layer (0−20 cm depth) soil samples including 54 from greenhouses and 38 from open fields were taken, and soil pH, electrical conductivity (EC), total soluble salt (TS), soil organic matter (SOM), total nitrogen (TN), available phosphorus (AP), and available potassium (AK) were measured. The results reveal that, soil pH was lower 1.0 units in greenhouses than that in open field. TS was higher 82% and AP was higher 160% overall. Similarly, SOM and TN were higher 32% and 46%, respectively, while AK changed slightly at a higher 1% rate. Results also show that soil properties varied depending on cultivation time and vegetable types. Overall, pH continuously decreased with cultivation time while other soil fertility indicators reached a maximum value after nine years of cultivation before starting to decrease. The effect of leafy vegetable planting on soil was slight overall, while the impact of fruits on soil was more serious. Compared with changes in plain greenhouse soil fertility measured across the eastern China, the effects of greenhouses on soil in Lhasa remain relatively limited; and the change in the degree of soil fertility was lower and the extreme values of soil fertility occurred later in Lhasa.

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“…Filter membranes (usually 0.45 μm pore sizes) have been applied as protective layer, preventing some large particles from contaminating or damaging diffusive gels outer surface. Polyvinylidene fluoride (PVDF) membranes, cellulose nitrate membranes (CN), cellulose acetate membrane and hydrophilic polyethersulfone filter membranes (PES) are commonly used as DGT filter membrane (Desaulty et al 2017;Kalkhajeh et al 2018;Rolisola et al 2014;Wang et al 2016;Yabuki et al 2014). reported the diffusion coefficients obtained by diffusion gels plus filter membranes were higher than those determined by the diffusion gel alone.…”

Section: Filter Membranementioning

confidence: 99%

“…Dryland soil must be moisturized prior to DGT deployment, but the water content has not been standardized in the literature (Kalkhajeh et al 2018;Luo et al 2014). Some researchers adjusted the water content at a high level (over 90% of the maximum water holding capacity) (Guan et al 2016;Gao et al 2017;Kalkhajeh et al 2018;Zhang et al 2004). This may result in anoxic condition in soils and cause the bias of the measurement from the field.…”

Section: Dgt Deployment In Soilsmentioning

confidence: 99%

Diffusive gradients in thin films: devices, materials and applications

Ding

Yang

et al. 2018

Environ Chem Lett

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DGT technique to assess P mobilization from greenhouse vegetable soils in China: A novel approach

Cited by 23 publications

References 34 publications

Sensitivity of Three Phosphate Extraction Methods to the Application of Phosphate Species Differing in Immediate Plant Availability

Sensitivity of Three Phosphate Extraction Methods to the Application of Phosphate Species Differing in Immediate Plant Availability

Investigating the Effects of Greenhouse Vegetable Cultivation on Soil Fertility in Lhasa, Tibetan Plateau

Diffusive gradients in thin films: devices, materials and applications

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