Condutividade hidráulica de um Latossolo Vermelho Amarelo, não-saturado, utilizando-se sonda de nêutrons

Carvalho, Laércio Alves de; Libardi, Paulo Leonel

doi:10.4025/actasciagron.v32i1.909

Cited by 1 publication

(3 citation statements)

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“…This calibration relates the observed counting to the water content at the time and position of the measurement. Several studies were conducted on this matter, and it is known Rev Bras Cienc Solo 2021;45:e0210089 that sometimes a particular or a dedicated calibration equation is needed (Bacchi et al, 2002;Antonino et al, 2005;Silva et al, 2006;Carvalho and Libardi, 2010;Borges et al, 2018). Also, studies designed for comparing neutron gauge measurements with traditional methods as, for instance, non-radioactive methods (soil-core sampling, tensiometers, piezometers, etc.)…”

Section: Soil Neutron Gauge Technique and Usagementioning

confidence: 99%

“…These studies are based on the water balance in the presence or absence of different crops in field conditions. Some of the studies indicate the need for dedicated calibration curves for determining the soil water content using the neutron gauges (Reichardt et al, 1997;Bacchi et al, 2002;Timm et al, 2005;Silva et al, 2006;Grego et al, 2006;Carvalho and Libardi, 2010;Souza et al, 2011). Also, it is mentioned that at the field level, the use of data obtained at meteorological stations distant from the experiment plot can produce an inadequate measurement of the rainfall (P) and consequently bias the water storage variation calculations (Silva et al, 2006).…”

Section: Soil Neutron Gauge Technique and Usagementioning

confidence: 99%

“…Finally, there are also studies for determining the non-saturated hydraulic conductivity of the soil at field conditions (Bacchi et al, 2002;Timm et al, 2005;Carvalho and Libardi, 2010). In this kind of study, the internal soil drainage is registered using tensiometers and neutron gauge measurements.…”

Section: Soil Neutron Gauge Technique and Usagementioning

confidence: 99%

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Use of nuclear techniques in soil science: A literature review of the Brazilian contribution

Pires¹,

Cássaro²,

Correchel³

2021

Revista Brasileira De Ciência Do Solo

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This review presents the basic research and some applications of the gamma-ray attenuation, neutron gauges, and 137 Cs fallout techniques for studying soil physical processes and properties. The selected studies aimed to give the readers a general idea of the use of these nuclear techniques carried out by Brazilian researchers in the past decades. It is expected to assist future researchers by identifying knowledge gaps and opportunities for applying the methods presented here. Around 100 studies were selected for this review. The papers dealing with gamma-ray attenuation are mostly related to the analysis of soil radiation interactions, the measurement of basic soil physical properties, the evaluation of hydraulic conductivity, water retention curve, and soil mechanical analysis. Neutron gauge applications are related to monitoring the water distribution and balance at the field scale, procedures for calibrating the existing gauge for the Brazilian soils, and analyzing the spatial and temporal variability of the soil water content. The 137 Cs methodology involves studies about the erosion and sediment deposition in small watersheds and riparian zones, the spatial variability of 137 Cs inventories at reference sites, and the measurement of sediment spatial distributions. Future studies with the gamma-ray attenuation methodology should focus on a better comprehension of the photon interaction with the soil and a correct selection of photon energies to investigate contrasting soils. This is mandatory for adopting it as a reliable tool for soil characterization. This review also revealed that the challenges for the future use of the 137 Cs fallout technique involve the continuous decrease of the 137 Cs activity worldwide, including in Brazil. Advances in detection systems (gamma spectrometers) will be required to overcome this issue. Future studies should focus on the use of correction factors related to the enrichment of fine particles during the transport of sediments to improve the estimates obtained through the conversion models. The use of neutron gauges to detect soil water content at the field scale depends on the adoption of reliable calibration curves. Then, comprehending how soil properties alter this curve and how it affects the water balance is a study of great interest. Motivated by strict regulations on the use of radioactive materials, the adoption of gauges with less activity is becoming a new goal. Thus, the development of more effective systems of neutron detection is crucial.

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Section: Soil Neutron Gauge Technique and Usagementioning

confidence: 99%