Multivariate statistical analysis correlating 238U, 232Th, and 40K equivalent activities in soil to geochemical data from an agricultural area

Becegato, Valter Antônio; Becegato, Vitor Rodolfo; Baum, Camila Angélica; Lavnitcki, Laís; Paulino, Alexandre Tadeu

doi:10.1007/s11368-018-2161-6

Cited by 9 publications

(2 citation statements)

References 34 publications

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“…In the area, with each new planting, crop improvement is achieved by adding soluble fertilizer such as NPK. Plants uptake and hydric erosion consume the added potassium upslope, while an expected transport of K adsorbed in the clay particles and/or in the soil solution toward the wetland explains the obtained radionuclide signatures (Becegato et al, 2019). The multivariate dataset was constructed using three gamma variables, hydraulic conductivity, and altitude.…”

Section: Resultsmentioning

confidence: 99%

Applied in-situ gamma-ray spectrometry for evaluating erosion and fertilizer accumulation in the tropical soil around small isolated wetland

Moreira,

Govone,

Marchetti

et al. 2024

Preprint

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Gamma-ray spectrometry has great potential to enhance the understanding of tropical soil properties, including those under intensive agriculture. We utilized gamma-ray spectrometry to assess erosion and the potential accumulation of NPK fertilizer in soil intensively cultivated for sugarcane monoculture, surrounding a small isolated wetland. Conducted in southeastern Brazil, our study involved measurements at 899 soil surface points using gamma-ray spectrometry to detect emissions from radionuclides such as uranium (U238), thorium (Th232), and potassium (K40). Additionally, we measured the hydraulic conductivity (Ksat) at 42 points to evaluate the hydro-physical attributes of the soil surface. The γ-radiation exhibited a close relationship with soil texture, leaching, and prevailing chemical removal. Hydric erosion that affects upslope soil shows high Ksat and very low K. The results indicate that the low K radionuclide contents in the upper soil horizon surrounding the small wetland are attributed to advanced tropical pedogenesis intensified by hydric erosion, with a high correlation with soil texture. The spatial analysis indicates heterogeneity of eU, and to a lesser extent eTh, exhibited levels lower than those found in the parent material, saprolite, and upper soil layers from the weathering profile. This suggests that soluble fertilizers have limited impact on the concentration of the radionuclides in agricultural areas surrounding the small wetland. Significant mobility, particularly of eU, can be associated with pedogenesis. Gamma-spectrometry detected variations in the distribution of the autocorrelated eU and eTh, suggesting a complex bonding with Fe-oxides or clay contents influenced by the small wetland.

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Section: Resultsmentioning

confidence: 99%

Applied in-situ gamma-ray spectrometry for evaluating erosion and fertilizer accumulation in the tropical soil around small isolated wetland

Moreira,

Govone,

Marchetti

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…For such applications, quantitative spectra evaluation is not mandatory, and sophisticated data processing steps [2,12] are dispensable. However, depending on the geopedological context, different spectral features may show optimal correlation with soil texture [14,33,34]. Therefore, if only pattern recognition is required, TC as stand-alone proxies are sufficient and, at the same time, less prone to errors than single ROI.…”

Section: Recognition Of Spatial Patterns Of Gamma Featuresmentioning

confidence: 99%

Proximal Mobile Gamma Spectrometry as Tool for Precision Farming and Field Experimentation

2020

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Soils naturally emit gamma radiation that can be recorded using gamma spectrometry. Spectral features are correlated with soil mineralogy and texture. Recording spectra proximally and in real-time on heterogeneous agricultural fields is an option for precision agriculture. However, the technology has not yet been broadly introduced. This study aims to evaluate the current state-of-the art by (i) elucidating limitations and (ii) giving application examples. Spectra were recorded with a tractor-mounted spectrometer comprising two 4.2 L sodium iodide (NaI) crystals and were evaluated with the regions of interest for total counts, 40Potassium, and 232Thorium. A published site-independent multivariate calibration model was further extended, applied to the data, and compared with site-specific calibrations that relied on linear correlation. In general, site-specific calibration outperformed the site-independent approach. However, in specific cases, different sites could also replace each other in the site-independent model. Transferring site-specific models to neighbouring sites revealed highly variable success. However, even without data, post-processing gamma surveys detected spatial texture patterns. For most sites, mean absolute error of prediction in the test-set validation was below 5% for single texture fractions. On this basis, thematic maps for agricultural management were derived. They showed quantitative information for lime requirement in the range from 1068 to 3560 kg lime ha−1 a−1 (equivalent to 600–2000 kg calcium oxide (CaO) ha−1 a−1 if converted to the legally prescribed unit) and for field capacity (26−44% v/v). In field experimentation, spatially resolved texture data can serve (i) to optimize the experimental design or (ii) as a complementary variable in statistical evaluation. We concluded that broadening the database and developing universally valid prediction models is needed for introduction into agricultural practice. Though, the current state-of-the-art allows valuable application in precision agriculture and field experimentation, at least on the basis of site-specific or regional basis.

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Harmful Effects of Potentially Toxic Elements in Soils of Cerrado Biomes

Cabral

Gentil

Ramalho

et al. 2023

Water Air Soil Pollut

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Multivariate statistical analysis correlating 238U, 232Th, and 40K equivalent activities in soil to geochemical data from an agricultural area

Cited by 9 publications

References 34 publications

Applied in-situ gamma-ray spectrometry for evaluating erosion and fertilizer accumulation in the tropical soil around small isolated wetland

Applied in-situ gamma-ray spectrometry for evaluating erosion and fertilizer accumulation in the tropical soil around small isolated wetland

Proximal Mobile Gamma Spectrometry as Tool for Precision Farming and Field Experimentation

Harmful Effects of Potentially Toxic Elements in Soils of Cerrado Biomes

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