Comparing chemical extraction and a piecewise function with diffusive gradients in thin films for accurate estimation of soil zinc bioavailability to Sedum plumbizincicola

2019 ◽  
Author(s):  
J.W. Zhou ◽  
L.H. Wu ◽  
T. Zhou ◽  
Z. Li ◽  
X.Y. Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Extraction ◽  
Accurate Estimation ◽  
Sedum Plumbizincicola ◽  
Piecewise Function ◽  
Zinc Bioavailability ◽  
Diffusive Gradients ◽  
Soil Zinc

scholarly journals Soybean Fertilized by P-Phases from Bagasse-Based Materials: P-Extraction Procedures, Diffusive Gradients in Thin Films (DGT), and X-ray Diffraction Analysis (XRD)

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 895
Author(s):  
Hannes Herzel ◽  
Vitalij Dombinov ◽  
Christian Vogel ◽  
Sabine Willbold ◽  
Gabriel Vettorazzi Levandowski ◽  
...  
Keyword(s):  
Thin Films ◽  
Extraction Methods ◽  
Post Treatment ◽  
Ammonium Citrate ◽  
Chemical Extraction ◽  
P Availability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Extraction Methods ◽  
Diffusive Gradients

The Brazilian sugarcane industry produced around 173 million tons (Mt) of bagasse in 2018. Bagasse is a by-product of juice extraction for ethanol and sugar production and is combusted in order to generate power, producing up to 10 Mt of ash per year. This ash contains various concentrations of plant nutrients, which allow the ash to be used as a crop fertilizer. However, the concentration and extractability of phosphorus (P), an essential plant nutrient, are low in bagasse ash. To increase the P content, we co-gasified and co-combusted bagasse with P-rich chicken manure. The resulting ash was thermochemically post-treated with alkali additives (Na2SO4 and K2SO4) to increase the availability of P to plants. We aimed to: (i) investigate the effect of thermochemical post-treatment of co-gasification residue and co-combustion ash on P availability to soybeans, (ii) explore the potential of chemical extraction methods (citric acid, neutral ammonium citrate, formic acid, and Mehlich-I) and diffusive gradients in thin films (DGT) to predict the availability of P to soybeans, and (iii) identify the responsible P-phases using X-ray diffraction. We evaluated P availability to soybeans growing in Brazilian Oxisol soil in two independent greenhouse pot experiments. The positive effect of thermochemical treatment on P availability from gasification residue was confirmed through the observation of increased P uptake and biomass in soybean plants. These findings were confirmed by chemical extraction methods and DGT. The gasification residue contained whitlockite as its main P-bearing phase. Thermochemical post-treatment converted whitlockite into highly soluble CaNaPO4. In contrast, co-combustion ash already contained highly soluble Ca(Na,K)PO4 as its main P-bearing phase, making thermochemical post-treatment unnecessary for increasing P availability. In conclusion, increased extractability and availability of P for soybeans were closely connected to the formation of calcium alkali phosphate. Our findings indicate that this combined methodology allows for the prediction of P-fertilization effects of ash.

A new method for determination of potassium in soils using diffusive gradients in thin films (DGT)

2012 ◽  
Vol 9 (1) ◽  
pp. 14 ◽  
Author(s):  
Susan Tandy ◽  
Simon Mundus ◽  
Hao Zhang ◽  
Enzo Lombi ◽  
Jens Frydenvang ◽  
...  
Keyword(s):  
Thin Films ◽  
Crop Production ◽  
Ammonium Acetate ◽  
Agricultural Soils ◽  
Sandy Loam ◽  
Cation Exchange Resin ◽  
Chemical Extraction ◽  
Plant Nutrient ◽  
Deployment Time ◽  
Diffusive Gradients

Environmental contextPotassium is an essential plant nutrient and farmers need to be able to predict how much soil K is plant available in order to optimise fertiliser applications and crop production. Traditional methods such as chemical extraction are generally poor predictors. A DGT based methodology that could enhance the assessment of plant available K is developed, which will assist plant growers to determine the correct fertiliser application, thereby avoiding crop deficiencies and limiting the misuse of K as a precious natural resource. AbstractPotassium is an essential plant nutrient often limiting plant productivity. Ammonium acetate extraction is often used to predict the potassium status of soils. However, correlation between extracted K and plant uptake is often poor, especially over a range of different soil textures. Diffusive gradients in thin films (DGT), which determines the diffusive supply of elements, has been shown to accurately measure plant available elements in several cases. Up until now, however, the DGT devices available have not been suitable for measuring K. We set out to develop a DGT device suitable for the measurement of K in soil and test its ability to predict plant available K. The DGT device contained a binding layer based on Amberlite IRP-69 cation exchange resin. It proved suitable for the measurement of K under conditions similar to those usually found in soil if a 2-h deployment time was used and the labile K concentration was limited to 400 µM. Prediction of plant K concentrations with DGT were similar to those with ammonium acetate extractions over a range of typical agricultural soils with sandy and sandy loam textures. The results indicate that this new type of DGT has the potential to improve the accuracy of predictions of the K status of soils, although more tests using a wider range of plant species and soils are necessary.

Localised mobilisation of metals, as measured by diffusive gradients in thin-films, in soil historically treated with sewage sludge

Chemosphere ◽  
2013 ◽  
Vol 90 (2) ◽  
pp. 464-470 ◽  
Author(s):  
Jun Luo ◽  
Hao Zhang ◽  
William Davison ◽  
Ronald G. McLaren ◽  
Lynne M. Clucas ◽  
...  
Keyword(s):  
Thin Films ◽  
Sewage Sludge ◽  
Diffusive Gradients
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