Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Batista, Araína Hulmann; Melo, Vander Freitas; Gilkes, Robert

doi:10.1590/18069657rbcs20160067

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Based on previous work, this one of the cubic polynomial model has been justified, for example, Villwock et al (2004), in which the calibration equation model that had a coefficient of determination closest to 1 was the cubic polynomial model. For Batista et al (2016), the cubic polynomial equations had a calibration coefficient close to the ideal for 5 soil types with different textural classes. Regardless of the soil with a clayier texture having shown less efficiency in the cubic model, it still had a good calibration adjustment.…”

Section: Resultsmentioning

confidence: 86%

Construction and calibration of Time Domain Reflectometry probes for assessing soil humidity in distropheric red latosol

Dagher

Sanches

Jesus

et al. 2020

Int J Innov Educ Res

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Among the indirect methods of assessing soil moisture, Time Domain Reflectometry (TDR) stands out, which uses the soil dielectric constant to provide volumetric moisture efficiently, quickly and non-destructively. Despite a practical and precise method, TDR has a high cost due to the probes and its Data Logger. In view of this, the present work aims to build and calibrate TDR probes to assess moisture in a Dystrophic Red Latosol. The present work was carried out in the experimental area of the hydraulics laboratory of the Federal University of Grande Dourados (UFGD), located in Dourados-MS, at latitude 22⁰ 12 'south, longitude 54⁰ 59' west and altitude of 434 meters. Each probe built consisted of 3 stainless steel rods (Ø = 3 mm; L = 230 mm) RG 98 cable with 90% mesh and 50 ohm impedance, 4.7 pF ceramic capacitor and BNC connector. The construction procedures followed the following steps: 1- Making the cable, 2- Preparing the rods, 3- Welding the rods to the wires, 4 -Operating test and 5 - finishing phase. After construction, they were calibrated with the characteristic soil of the Region, proceeding with the Probe Reading in two depths (10 and 30 cm) and simultaneous collection of deformed soil samples to determine the moisture based on mass in Laboratory. Subsequently, calibrations with cubic polynomial adjustment were performed. The results showed adjustments with high determination coefficients, and the probes developed showed satisfactory performances.

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Section: Resultsmentioning

confidence: 86%

Construction and calibration of Time Domain Reflectometry probes for assessing soil humidity in distropheric red latosol

Dagher

Sanches

Jesus

et al. 2020

Int J Innov Educ Res

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“…Determination of soil pH was carried out in a 0.01 mol/L CaCl 2 solution; exchangeable P, K, Ca, and Mg by the ion exchange resin method; exchangeable Al by 1 mol/L KCl; and potential acidity (H + Al) by the SMP buffer solution. Cation exchange capacity was the sum of exchangeable Ca, Mg, K, Na, Al, and H. Total elements were determined by microwave-assisted digestion with nitric and hydrochloric acid (EPA 3051A method) followed by ICP-AES (EPA 6010D method), according to EPA SW-846 except for K, which was determined by flame photometry after digestion by the EPA 3051A method [27].…”

Section: Sampling and Analyzing Soil And Saprolitementioning

confidence: 99%

The Loss of Soil Parent Material: Detecting and Measuring the Erosion of Saprolite

Evans,

Cândido,

Coelho

et al. 2024

Soil Systems

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Soil parent material is a fundamental natural resource for the generation of new soils. Through weathering processes, soil parent materials provide many of the basic building blocks for soils and have a significant bearing on the physico-chemical makeup of the soil profile. Parent materials are critical for governing the stock, quality, and functionality of the soil they form. Most research on soil parent materials to date has aimed to establish and measure the processes by which soil is generated from them. Comparatively little work has been performed to assess the rates at which soil parent materials erode if they are exposed at the land surface. This is despite the threat that the erosion of soil parent materials poses to the process of soil formation and the loss of the essential ecosystem services those soils would have provided. A salient but unanswered question is whether the erosion of soil parent materials, when exposed at the land surface, outpaces the rates at which soils form from them. This study represents one of the first to detect and measure the loss of soil parent material. We applied Uncrewed Aerial Vehicle Structure-From-Motion (UAV-SfM) photogrammetry to detect, map, and quantify the erosion rates of an exposed saprolitic (i.e., weathered bedrock) surface on an agricultural hillslope in Brazil. We then utilized a global inventory of soil formation to compare these erosion rates with the rates at which soils form in equivalent lithologies and climatic contexts. We found that the measured saprolite erosion rates were between 14 and 3766 times faster than those of soil formation in similar climatic and lithological conditions. While these findings demonstrate that saprolite erosion can inhibit soil formation, our observations of above-ground vegetation on the exposed saprolitic surface suggests that weathered bedrock has the potential to sustain some biomass production even in the absence of traditional soils. This opens up a new avenue of enquiry within soil science: to what extent can saprolite and, by extension, soil parent materials deliver soil ecosystem services?

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“…Although Ferralsols have low cation contents, previous studies have reported the presence of structural K and non-exchangeable K forms (Mielniczuk, 1977;Goedert, 1983;Martins et al, 2004;Faria et al, 2012;Alves et al, 2013). Structural K is usually associated with the silt fraction of Ferralsols, in recalcitrant minerals such as mica and feldspars (Melo et al, 1995;Batista et al, 2016). The non-exchangeable K is linked to the presence of expandable 2:1 clay minerals (Silva et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?

Moterle

Bortoluzzi

Kaminski

et al. 2019

Rev. Bras. Ciênc. Solo

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Ferralsols (Latossolos) should contain few or no 2:1 clay minerals and have low potassium (K) contents, and consequently low levels of non-exchangeable K forms are expected. The aim of this study was to evaluate how the clay mineralogy of a Ferralsol affects the soil K dynamics in response to K fertilization during cropping and whether the clay mineralogy was altered due to successive crops and K fertilization. A tropical Brazilian Ferralsol under field conditions was sampled (0.00-0.20 m) in contrasting K fertilization plots: no K application (control plot) and 3,200 kg ha-1 applied K 2 O fertilizer. These two treatments were submitted at eight different crop cycles, performed in pots under greenhouse conditions, and fertilized with 0, 30, and 90 mg kg-1 K 2 O before each crop cycle. The biomass K, exchangeable K, non-exchangeable K, and structural K contents were determined after each crop cycle. At the end of the experiment, the presence of 2:1 clay minerals with hydroxy-aluminum interlayered in the soil clay fraction was verified, which ensured K adsorption in a form available to plants when K fertilizer was added. Cropping without K fertilization resulted in limited crop yields and exhausted the exchangeable and non-exchangeable K soil reserves. The previous K fertilization history influenced the soil K reserve and its availability to plants in the Ferralsol studied. The crops without K addition decreased the proportion of 2:1 hydroxy-Al interlayer minerals in the soil in relation to the kaolinite clay minerals.

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Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Cited by 5 publications

References 15 publications

Construction and calibration of Time Domain Reflectometry probes for assessing soil humidity in distropheric red latosol

Construction and calibration of Time Domain Reflectometry probes for assessing soil humidity in distropheric red latosol

The Loss of Soil Parent Material: Detecting and Measuring the Erosion of Saprolite

Does Ferralsol Clay Mineralogy Maintain Potassium Long-Term Supply to Plants?

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